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Aryl halide

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The aryl halides produced on the largest scale are chlorobenzene and the isomers of dichlorobenzene. One major but discontinued application was the use of chlorobenzene as a solvent for dispersing the herbicide Lasso. Overall, production of aryl chlorides (also naphthyl derivatives) has been
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derivatives. Arenes with electron donating groups react with halogens even in the absence of Lewis acids. For example, phenols and anilines react quickly with chlorine and bromine water to give multihalogenated products. Many detailed laboratory procedures are available. For alkylbenzene
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were used extensively from the 1930s to 1950s in cable and capacitor production, due to their insulating, hydrophobic, and flame retardant properties, but they have since been phased out for this use due to toxicity, environmental persistence, and introduction of new materials.
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Unlike in most other substitution reactions, fluoride is the best leaving group, and iodide the worst. A 2018 paper indicates that this situation may actually be rather common, occurring in systems that were previously assumed to proceed via
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Aryl chlorides are the aryl halides produced on the largest scale commercially: 150,000 tons/y in the US alone (1994). Production levels are decreasing owing to environmental concerns. Chlorobenzenes are used mainly as solvents.
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because they exhibit many differences in methods of preparation and properties. The most important members are the aryl chlorides, but the class of compounds is so broad that there are many derivatives and applications.
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The C-X distances for aryl halides follow the expected trend. These distances for fluorobenzene, chlorobenzene, bromobenzene, and methyl 4-iodobenzoate are 135.6(4), 173.90(23), 189.8(1), and 209.9
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This method is applicable to the preparation of all aryl halides. One limitation is that most, but not all, aryl lithium and Grignard reagents are produced from aryl halides.
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Many chlorinated and brominated aromatic compounds are produced by marine organisms. The chloride and bromide in ocean waters are the source of the halogens. Various
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The halides can be displaced by strong nucleophiles via reactions involving radical anions. Alternatively aryl halides, especially the bromides and iodides, undergo
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Unlike typical alkyl halides, aryl halides typically do not participate in conventional substitution reactions. Aryl halides with electron-withdrawing groups in the
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Siegemund, Günter; Schwertfeger, Werner; Feiring, Andrew; Smart, Bruce; Behr, Fred; Vogel, Herward; McKusick, Blaine (2000). "Pyridine and Pyridine Derivatives".
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Mondal, Santanu; Raja, Karuppusamy; Schweizer, Ulrich; Mugesh, Govindasamy (2016). "Chemistry and Biology in the Biosynthesis and Action of Thyroid Hormones".
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Siegemund, Günter; Schwertfeger, Werner; Feiring, Andrew; Smart, Bruce; Behr, Fred; Vogel, Herward; McKusick, Blaine (2002). "Fluorine Compounds, Organic".
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conditions, whereas ring halogenation is favored in the presence of Lewis acids. The decolouration of bromine water by electron-rich arenes is used in the
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Snieckus, Victor (1990). "Directed ortho metalation. Tertiary amide and O-carbamate directors in synthetic strategies for polysubstituted aromatics".
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sp. nov., a novel bioprocessor isolated actinomycete with the ability to degrade chlorobenzene, dichlorobenzene and phenol as sole carbon sources".
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Aryl fluorides are used as synthetic intermediates, e.g. for the preparation of pharmaceuticals, pesticides, and liquid crystals. The conversion of
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includes halogenated derivatives of any aromatic compound, it commonly refers to halobenzenes, which are specifically halogenated derivatives of
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Brito, Juan P.; Ross, Joseph S.; El Kawkgi, Omar M.; Maraka, Spyridoula; Deng, Yihong; Shah, Nilay D.; Lipska, Kasia J. (2021).
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can also be used to convert diazonium salts to bromobenzenes using using copper-based reagents. Owing to high cost of
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of benzene has been well investigated, motivated by the avoidance of HCl as a coproduct in the direct halogenation:
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can also be used to convert diazonium salts to chlorobenzenes using copper-based reagents. Owing to high cost of
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Shimizu, Masaki; Hiyama, Tamejiro (2005). "Modern Synthetic Methods for Fluorine-Substituted Target Molecules".
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Electrophilic HalogenationReaction Pathways Involving Attack by Electrophilic Halogens on Unsaturated Compounds
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is a well established route to aryl fluorides. Thus, anilines are precursors to aryl fluorides. In the classic
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Aryl iodides can be prepared by treating diazonium salts with iodide salts. Electron-rich arenes such as
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containing at least two different types of halogens bonded to the same benzene ring. There are also many
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Beck, U.; Löser, E. (2011). "Chlorinated Benzenes and Other Nucleus-Chlorinated Aromatic Hydrocarbons".
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reaction, aryl halides are converted to aryl lithium compounds. Illustrative is the preparation of
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reactions. For example, 2,4-dinitrochlorobenzene reacts in basic solution to give a phenol.
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Gribble, Gordon W. (2004). "Natural Organohalogens: A New Frontier for Medicinal Agents?".
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Jacobsen, Eric N.; Harrison A. Besser; Zeng, Yuwen; Kwan, Eugene E. (September 2018).
1591: 1560: 1521: 1503: 1456: 1438: 1389: 1323: 1271: 1222: 1185: 1096: 1063: 1031: 1005: 980: 935: 902: 717:, to give organometallic derivatives that function as sources of aryl anions. By the 489: 81: 43: 31: 1257: 1583: 1552: 1511: 1495: 1446: 1430: 1381: 1358: 1313: 1305: 1261: 1253: 1214: 1177: 1152: 1125: 1088: 1040: 972: 927: 894: 765: 549: 428: 414: 1385: 1092: 816: 587: 546: 375: 306: 278: 1556: 1309: 864:
Aryl bromides are widely used as fire-retardants. The most prominent member is
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Oberhammer, Heinz (2009). "The Structural Chemistry of Carbon-Halogen Bonds".
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is poorly reactive toward bromine, necessitating the use of acidic media.
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Lyday, Phyllis A.; Kaiho, Tatsuo (2015). "Iodine and Iodine Compounds".
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Many commercial aryl fluorides are produced from aryl chlorides by the
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Ritter, Tobias; Hooker, Jacob M.; Neumann, Constanze N. (June 2016).
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The chemical structure of 6,6′-dibromoindigo, the main component of
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Atkinson, Edward R.; Murphy, Donald M.; Lufkin, James E. (1951). "
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declining since the 1980s, in part due to environmental concerns.
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Aromatic compounds containing Halogen atom(s) in place of Hydrogen
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by electrophilic iodination of tyrosine derivative. Synthetic T
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Reaction between benzene and halogen to form an halogenobenzene
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Monochlorination of benzene is accompanied by formation of the
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Janssen, Donald E.; Wilson, C. V. (1956). "4-Iodoveratrole".
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is one of the most heavily prescribed medicines in the U.S.
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Ioffe, D.; Kampf, A. (2002). "Bromine, Organic Compounds".
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in which one or more hydrogen atoms, directly bonded to an
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or "direct chlorination" is the main synthesis route.
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and dimethoxy derivatives react directly with iodine.
1062:. Englewood Cliffs, N.J: Prentice Hall. p. 947. 62: 1024: 1408: 1242:"Levothyroxine Use in the United States, 2008-2018" 704: 354:, this method is reserved for specialty chlorides. 397:, this method is reserved for specialty bromides. 678:Aryl halides often react via the intermediacy of 504:Halopyridines are based on the aromatic compound 362:The main aryl bromides produced commercially are 1609: 286:, the alkyl positions tend to be halogenated by 1580:Kirk-Othmer Encyclopedia of Chemical Technology 1476:"Concerted nucleophilic aromatic substitutions" 605:, is an aryl chloride isolated from soil fungi. 1173:Ullmann's Encyclopedia of Industrial Chemistry 1085:Ullmann's Encyclopedia of Industrial Chemistry 969:Ullmann's Encyclopedia of Industrial Chemistry 923:Ullmann's Encyclopedia of Industrial Chemistry 378:. They are produced by direct bromination of 1288: 1115: 884: 1538: 343:This technology is not widely used however. 523: 431:react with iodine to give the aryl halide: 1577: 1375: 1082: 1058:Boyd, Robert W.; Morrison, Robert (1992). 709:Aryl halides react with metals, generally 135:In some cases, the fluoride salt is used: 1515: 1450: 1317: 1265: 966: 962: 960: 958: 956: 954: 952: 540: 1142: 1000:Peter Bernard, David De la Mare (1976). 794:Chlorobenzene was once the precursor to 609: 592: 454:Halobenzenes and halobenzene derivatives 296: 1588:10.1002/0471238961.0218151325150606.a01 1340: 1294:"What's New in Enzymatic Halogenations" 1207:Angewandte Chemie International Edition 1051: 887:Angewandte Chemie International Edition 14: 1610: 1378:PATai's Chemistry of Functional Groups 1029:-4,4′,6,6′-Tetrachlorodiphenic Acid". 949: 528:Halogenated naphthalenes are based on 449:Classification according to aryl group 1539:Rehfuss, Marc; Urban, James (2005). " 798:, which is now made by oxidation of 624: 564:) are aryl iodides. A tetraiodide, T 181:. Illustrative is the synthesis of 1545:Systematic and Applied Microbiology 1298:Current Opinion in Chemical Biology 405:Synthetic aryl iodides are used as 24: 778: 770: 696: 63:Classification according to halide 25: 1639: 805: 472:. Groups of halobenzenes include 223: 67: 1292:; Walsh, Christopher T. (2007). 832:is produced from chlorobenzene: 705:Organometallic reagent formation 499: 357: 54:. Haloarenes are different from 1571: 1532: 1467: 1402: 1369: 1334: 1282: 1258:10.1001/jamainternmed.2021.2686 1233: 1198: 1163: 822: 641: 400: 374:. These materials are used as 1136: 1109: 1076: 1018: 1004:. Cambridge University Press. 993: 913: 878: 13: 1: 1386:10.1002/9780470682531.pat0002 1343:Journal of Chemical Education 1093:10.1002/14356007.a14_381.pub2 871: 815:is a bacterium that degrades 247:, is produced by this route: 636: 534:Polychlorinated naphthalenes 364:tetrabromophthalic anhydride 7: 1557:10.1016/j.syapm.2005.05.011 233:Friedel-Crafts halogenation 179:electron-withdrawing groups 10: 1644: 1310:10.1016/j.cbpa.2007.08.002 789:Buchwald–Hartwig amination 787:, and thus are subject to 673: 457: 1500:10.1038/s41557-018-0079-7 1290:Fujimori, Danica Galonić 1182:10.1002/14356007.a22_399 1130:10.15227/orgsyn.036.0046 1045:10.15227/orgsyn.031.0096 977:10.1002/14356007.o06_o03 932:10.1002/14356007.a11_349 819:as sole carbon sources. 524:Halogenated naphthalenes 411:cross-coupling reactions 1176:. Weinheim: Wiley-VCH. 926:. Weinheim: Wiley-VCH. 654:positions, can undergo 494:halobenzene derivatives 368:decabromodiphenyl ether 84:is the fluoride donor: 50:ring are replaced by a 1541:Rhodococcus phenolicus 1246:JAMA Internal Medicine 1219:10.1002/anie.201601116 899:10.1002/anie.200460441 812:Rhodococcus phenolicus 775: 719:metal-halogen exchange 701: 621: 607: 541:Aryl halides in nature 427:Aryl lithium and aryl 302: 866:tetrabromobisphenol-A 774: 700: 613: 596: 407:X-ray contrast agents 372:tetrabromobisphenol-A 300: 764:Direct formation of 682:. Chlorobenzene and 187:2-nitrochlorobenzene 183:2-fluoronitrobenzene 1492:2018NatCh..10..917K 1435:10.1038/nature17667 1427:2016Natur.534..369N 1355:2004JChEd..81.1441G 1157:10.1021/cr00104a001 1623:Aromatic compounds 1363:10.1021/ed081p1441 830:Triphenylphosphine 785:oxidative addition 776: 702: 622: 608: 490:mixed halobenzenes 464:Although the term 413:and conversion to 391:Gatterman reaction 384:Phthalic anhydride 382:and aryl ethers. 348:Gatterman reaction 303: 282:derivatives, e.g. 241:iron(III) chloride 78:Schiemann reaction 1421:(7607): 369–373. 1395:978-0-470-68253-1 1252:(10): 1402–1405. 1213:(27): 7606–7630. 1118:Organic Syntheses 1087:. pp. 1–13. 1069:978-0-13-643669-0 1060:Organic chemistry 1032:Organic Syntheses 791:-type reactions. 766:Grignard reagents 694:by this pathway. 625:Structural trends 429:Grignard reagents 415:Grignard reagents 206:Cl + KF → O 82:tetrafluoroborate 44:aromatic compound 32:organic chemistry 16:(Redirected from 1635: 1602: 1601: 1575: 1569: 1568: 1536: 1530: 1529: 1519: 1480:Nature Chemistry 1471: 1465: 1464: 1454: 1406: 1400: 1399: 1373: 1367: 1366: 1338: 1332: 1331: 1321: 1286: 1280: 1279: 1269: 1237: 1231: 1230: 1202: 1196: 1195: 1167: 1161: 1160: 1145:Chemical Reviews 1140: 1134: 1133: 1113: 1107: 1106: 1080: 1074: 1073: 1055: 1049: 1047: 1022: 1016: 1015: 997: 991: 990: 964: 947: 945: 917: 911: 910: 882: 686:react in liquid 633:, respectively. 550:triiodothyronine 547:thyroid hormones 508:. This includes 441: 376:flame retardants 339: 273: 219: 169: 156: 155: 152: 131: 114: 113: 110: 105: 104: 101: 21: 1643: 1642: 1638: 1637: 1636: 1634: 1633: 1632: 1608: 1607: 1606: 1605: 1598: 1576: 1572: 1537: 1533: 1472: 1468: 1407: 1403: 1396: 1374: 1370: 1339: 1335: 1287: 1283: 1238: 1234: 1203: 1199: 1192: 1168: 1164: 1141: 1137: 1114: 1110: 1103: 1081: 1077: 1070: 1056: 1052: 1023: 1019: 1012: 998: 994: 987: 965: 950: 942: 918: 914: 883: 879: 874: 859: 855: 851: 847: 843: 839: 825: 817:dichlorobenzene 808: 781: 779:Other reactions 759: 755: 751: 747: 707: 676: 670:Ar mechanisms. 669: 659: 644: 639: 627: 620: 606: 601:, an important 588:bromoperoxidase 575: 567: 563: 555: 543: 526: 510:chloropyridines 502: 462: 456: 451: 440:→ ArI + LiI 439: 435: 403: 395:diazonium salts 360: 352:diazonium salts 337: 333: 329: 325: 321: 317: 313: 307:oxychlorination 279:dichlorobenzene 271: 267: 263: 259: 255: 251: 226: 217: 213: 209: 205: 201: 197: 193: 168: 164: 160: 153: 150: 149: 147: 143: 139: 130: 126: 122: 118: 111: 108: 107: 102: 99: 98: 96: 92: 88: 74:diazonium salts 70: 65: 38:(also known as 28: 23: 22: 15: 12: 11: 5: 1641: 1631: 1630: 1625: 1620: 1604: 1603: 1597:978-0471238966 1596: 1570: 1551:(8): 695–701. 1531: 1486:(9): 917–923. 1466: 1401: 1394: 1368: 1333: 1281: 1232: 1197: 1191:978-3527306732 1190: 1162: 1151:(6): 879–933. 1135: 1108: 1101: 1075: 1068: 1050: 1017: 1010: 992: 986:978-3527306732 985: 948: 941:978-3527306732 940: 912: 893:(2): 214–231. 876: 875: 873: 870: 862: 861: 857: 853: 849: 845: 841: 837: 824: 821: 807: 806:Biodegradation 804: 780: 777: 762: 761: 757: 753: 749: 745: 706: 703: 675: 672: 667: 657: 643: 640: 638: 635: 626: 623: 614: 597: 573: 570:biosynthesised 565: 561: 553: 542: 539: 525: 522: 514:bromopyridines 501: 498: 478:chlorobenzenes 474:fluorobenzenes 458:Main article: 455: 452: 450: 447: 443: 442: 437: 402: 399: 359: 356: 341: 340: 335: 331: 327: 323: 322:+ 4 HCl + O 319: 315: 275: 274: 269: 265: 261: 257: 253: 225: 224:Aryl chlorides 222: 221: 220: 215: 211: 207: 203: 199: 195: 171: 170: 166: 162: 158: 145: 141: 133: 132: 128: 124: 120: 116: 94: 90: 69: 68:Aryl fluorides 66: 64: 61: 26: 9: 6: 4: 3: 2: 1640: 1629: 1628:Organohalides 1626: 1624: 1621: 1619: 1616: 1615: 1613: 1599: 1593: 1589: 1585: 1581: 1574: 1566: 1562: 1558: 1554: 1550: 1546: 1542: 1535: 1527: 1523: 1518: 1513: 1509: 1505: 1501: 1497: 1493: 1489: 1485: 1481: 1477: 1470: 1462: 1458: 1453: 1448: 1444: 1440: 1436: 1432: 1428: 1424: 1420: 1416: 1412: 1405: 1397: 1391: 1387: 1383: 1379: 1372: 1364: 1360: 1356: 1352: 1348: 1344: 1337: 1329: 1325: 1320: 1315: 1311: 1307: 1304:(5): 553–60. 1303: 1299: 1295: 1291: 1285: 1277: 1273: 1268: 1263: 1259: 1255: 1251: 1247: 1243: 1236: 1228: 1224: 1220: 1216: 1212: 1208: 1201: 1193: 1187: 1183: 1179: 1175: 1174: 1166: 1158: 1154: 1150: 1146: 1139: 1131: 1127: 1123: 1119: 1112: 1104: 1102:9783527306732 1098: 1094: 1090: 1086: 1079: 1071: 1065: 1061: 1054: 1046: 1042: 1038: 1034: 1033: 1028: 1021: 1013: 1011:9780521290142 1007: 1003: 996: 988: 982: 978: 974: 970: 963: 961: 959: 957: 955: 953: 943: 937: 933: 929: 925: 924: 916: 908: 904: 900: 896: 892: 888: 881: 877: 869: 867: 835: 834: 833: 831: 820: 818: 814: 813: 803: 801: 797: 792: 790: 786: 773: 769: 767: 752:Br + BuLi → C 743: 742: 741: 739: 735: 734:-butyllithium 733: 728: 724: 723:phenyllithium 720: 716: 712: 699: 695: 693: 689: 685: 681: 671: 663: 661: 653: 649: 634: 632: 618: 617:Tyrian Purple 612: 604: 600: 595: 591: 589: 585: 582: 577: 571: 559: 551: 548: 538: 535: 531: 521: 519: 518:agrochemicals 515: 511: 507: 500:Halopyridines 497: 495: 491: 488:, as well as 487: 483: 482:bromobenzenes 479: 475: 471: 467: 461: 446: 434: 433: 432: 430: 425: 423: 418: 416: 412: 408: 398: 396: 392: 387: 385: 381: 377: 373: 369: 365: 358:Aryl bromides 355: 353: 349: 344: 312: 311: 310: 308: 299: 295: 293: 289: 285: 280: 250: 249: 248: 246: 245:chlorobenzene 242: 238: 234: 230: 192: 191: 190: 188: 184: 180: 176: 175:Halex process 138: 137: 136: 87: 86: 85: 83: 79: 75: 60: 57: 53: 49: 45: 41: 37: 33: 19: 1579: 1573: 1548: 1544: 1540: 1534: 1483: 1479: 1469: 1418: 1414: 1404: 1377: 1371: 1349:(10): 1441. 1346: 1342: 1336: 1301: 1297: 1284: 1249: 1245: 1235: 1210: 1206: 1200: 1171: 1165: 1148: 1144: 1138: 1121: 1117: 1111: 1084: 1078: 1059: 1053: 1036: 1030: 1026: 1020: 1001: 995: 968: 921: 915: 890: 886: 880: 863: 848:+ 6 Na → P(C 826: 823:Applications 810: 809: 793: 782: 763: 737: 731: 727:bromobenzene 708: 684:sodium amide 677: 664: 651: 647: 645: 642:Substitution 628: 578: 544: 527: 503: 486:iodobenzenes 465: 463: 444: 426: 419: 404: 401:Aryl iodides 388: 361: 345: 342: 304: 292:bromine test 288:free radical 276: 231: 227: 172: 134: 71: 39: 35: 29: 18:Aryl halides 760:Li + BuBr 530:naphthalene 466:aryl halide 460:Halobenzene 237:Lewis acids 56:haloalkanes 36:aryl halide 1618:Haloarenes 1612:Categories 872:References 603:antibiotic 599:Vancomycin 581:peroxidase 436:ArLi + I 272:Cl + HCl 1508:1755-4349 1443:1476-4687 715:magnesium 637:Reactions 558:thyroxine 218:F + KCl 157:]F → C 40:haloarene 1565:16261859 1526:30013193 1461:27281221 1328:17881282 1276:34152370 1227:27226395 907:15614922 860:+ 6 NaCl 844:Cl + PCl 740:-BuLi): 690:to give 680:benzynes 506:pyridine 422:anilines 334:Cl + H 48:aromatic 42:) is an 1517:6105541 1488:Bibcode 1452:4911285 1423:Bibcode 1351:Bibcode 1319:2151916 1267:8218227 711:lithium 692:aniline 688:ammonia 674:Benzyne 586:(e.g., 584:enzymes 470:benzene 380:phenols 326:→ 4 C 284:toluene 239:, e.g. 165:F + N 123:F + N 1594:  1563:  1524:  1514:  1506:  1459:  1449:  1441:  1415:Nature 1392:  1326:  1316:  1274:  1264:  1225:  1188:  1124:: 46. 1099:  1066:  1039:: 96. 1008:  983:  938:  905:  800:cumene 796:phenol 729:using 556:) and 484:, and 370:, and 140:[C 89:[C 52:halide 725:from 648:ortho 264:→ C 260:+ Cl 185:from 127:+ BF 115:→ C 34:, an 1592:ISBN 1561:PMID 1522:PMID 1504:ISSN 1457:PMID 1439:ISSN 1390:ISBN 1324:PMID 1272:PMID 1223:PMID 1186:ISBN 1097:ISBN 1064:ISBN 1006:ISBN 981:ISBN 936:ISBN 903:PMID 652:para 650:and 545:The 512:and 389:The 346:The 305:The 1584:doi 1553:doi 1512:PMC 1496:doi 1447:PMC 1431:doi 1419:534 1382:doi 1359:doi 1314:PMC 1306:doi 1262:PMC 1254:doi 1250:181 1215:doi 1178:doi 1153:doi 1126:doi 1089:doi 1041:doi 973:doi 928:doi 895:doi 836:3 C 713:or 568:is 314:4 C 106:]BF 30:In 1614:: 1590:. 1582:. 1559:. 1549:28 1547:. 1520:. 1510:. 1502:. 1494:. 1484:10 1482:. 1478:. 1455:. 1445:. 1437:. 1429:. 1417:. 1413:. 1388:. 1380:. 1357:. 1347:81 1345:. 1322:. 1312:. 1302:11 1300:. 1296:. 1270:. 1260:. 1248:. 1244:. 1221:. 1211:55 1209:. 1184:. 1149:90 1147:. 1122:36 1120:. 1095:. 1037:31 1035:. 1027:dl 979:. 971:. 951:^ 934:. 901:. 891:44 889:. 660:Ar 631:pm 560:(T 552:(T 532:. 520:. 496:. 480:, 476:, 366:, 294:. 210:NC 198:NC 189:: 80:, 1600:. 1586:: 1567:. 1555:: 1528:. 1498:: 1490:: 1463:. 1433:: 1425:: 1398:. 1384:: 1365:. 1361:: 1353:: 1330:. 1308:: 1278:. 1256:: 1229:. 1217:: 1194:. 1180:: 1159:. 1155:: 1132:. 1128:: 1105:. 1091:: 1072:. 1048:. 1043:: 1014:. 989:. 975:: 946:. 944:. 930:: 909:. 897:: 858:3 856:) 854:5 852:H 850:6 846:3 842:5 840:H 838:6 758:5 756:H 754:6 750:5 748:H 746:6 744:C 738:n 736:( 732:n 668:N 666:S 658:N 656:S 619:. 574:4 566:4 562:4 554:3 438:2 338:O 336:2 332:5 330:H 328:6 324:2 320:6 318:H 316:6 270:5 268:H 266:6 262:2 258:6 256:H 254:6 252:C 216:4 214:H 212:6 208:2 204:4 202:H 200:6 196:2 194:O 167:2 163:5 161:H 159:6 154:2 151:+ 148:N 146:5 144:H 142:6 129:3 125:2 121:5 119:H 117:6 112:4 109:− 103:2 100:+ 97:N 95:5 93:H 91:6 20:)

Index

Aryl halides
organic chemistry
aromatic compound
aromatic
halide
haloalkanes
diazonium salts
Schiemann reaction
tetrafluoroborate
Halex process
electron-withdrawing groups
2-fluoronitrobenzene
2-nitrochlorobenzene
Friedel-Crafts halogenation
Lewis acids
iron(III) chloride
chlorobenzene
dichlorobenzene
toluene
free radical
bromine test

oxychlorination
Gatterman reaction
diazonium salts
tetrabromophthalic anhydride
decabromodiphenyl ether
tetrabromobisphenol-A
flame retardants
phenols

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