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Organotantalum chemistry

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Tantalum alkylidene complexes arise by treating trialkyltantalum dichloride with alkyl lithium reagents. This reaction initially forms a thermally unstable tetraalkyl-monochloro-tantalum complex, which undergoes α-hydrogen elimination, followed by alkylation of the remaining chloride.
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Brennessel, William W.; Romanenkov, Alexander; Young, Victor G.; Ellis, John E. (2019). "Tantalum isocyanide complexes: TaI(CNDipp)6 (Dipp is 2,6-diisopropylphenyl) and ionic [Ta(CNDipp)7][Ta(CNDipp)6], a formal disproportionation product of the 17-electron Ta0 metalloradical
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of organotin compounds with tantalum(V) chloride. These organotantalum reagents promote the conjugate allylation of enones. Although the direct allylation of carbonyl groups is prevalent throughout the literature, little has been reported on the conjugate allylation of enones.
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Eisenberger, Patrick; Ayinla, Rashidat O.; Lauzon, Jean Michel P.; Schafer, Laurel L. (2009-10-19). "Tantalum–Amidate Complexes for the Hydroaminoalkylation of Secondary Amines: Enhanced Substrate Scope and Enantioselective Chiral Amine Synthesis".
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Payne, Philippa R.; Garcia, Pierre; Eisenberger, Patrick; Yim, Jacky C.-H.; Schafer, Laurel L. (2013-05-03). "Tantalum Catalyzed Hydroaminoalkylation for the Synthesis of α- and β-Substituted N-Heterocycles".
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McLain, S. J.; Wood, C. D.; Schrock, R. R. (1977-05-01). "Multiple metal-carbon bonds. 6. The reaction of niobium and tantalum neopentylidene complexes with simple olefins: a route to metallocyclopentanes".
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Takai, Kazuhiko; Kataoka, Y.; Utimoto, K. (1990-03-01). "Tantalum-alkyne complexes as synthetic intermediates. Stereoselective preparation of trisubstituted allylic alcohols from acetylenes and aldehydes".
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Bruck, M. A.; Copenhaver, A. S.; Wigley, D. E. (1987-10-01). "Alkyne cyclizations at reduced tantalum centers: synthesis and molecular structure of (.eta.6-C6Me6)Ta(O-2,6-i-Pr2C6H3)2Cl".
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Shibata, Ikuya; Kano, Takeyoshi; Kanazawa, Nobuaki; Fukuoka, Shoji; Baba, Akio (2002-04-15). "Generation of Organotantalum Reagents and Conjugate Addition to Enones".
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Dörfler, Jaika; Doye, Sven (2014-05-01). "A Commercially Available Tantalum Catalyst for the Highly Regioselective Intermolecular Hydroaminoalkylation of Styrenes".
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J. E. Ellis; A. Davison (1976). "Tris[Bis(2-Methoxyethyl)Ether]Potassium and Tetraphenylarsonium Hexacarbonylmetallates(1-) of Niobium and Tantalum".
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Pampaloni, G. (2010). "Aromatic hydrocarbons as ligands. Recent advances in the synthesis, the reactivity and the applications of bis(η6-arene) complexes".
320:. The chemistry developed by Maspero was later brought to fruition when Hartwig and Herzon reported the hydroaminoalkylation of olefins to form 45:. A wide variety of compound have been reported, initially with cyclopentadienyl and CO ligands. Oxidation states vary from Ta(V) to Ta(-I). 573: 520: 453: 1120: 660:
Labinger, Jay A.; Schwartz, Jeffrey; Townsend, John M. (1974-06-01). "Iodo- and hydridotantalum(III) complexes of dialkylacetylenes".
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Endy Y.-J. Min; John E. Bercaw (2014). "Bis(η -Pentamethylcyclopentadienyl) Complexes of Niobium and Tantalum".
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under an atmosphere of CO gives the salts of . These same anions can be obtained by carbonylation of tantalum
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Organotantalum compounds are of academic interest, but few or no commercial applications have been described.
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Some of the first reported organotantalum complexes were cyclopentadienyl derivatives. These arise from the
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Cotton, F. Albert; Hall, William T. (1979-08-01). "Reactions of tantalum(III) with alkynes and nitriles".
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Kleinhenz, S.; Pfennig, V.; Seppelt, K. (1998). "Preparation and Structures of , , , and ".
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Yamamoto, Yoshinori; Asao, Naoki (1993-09-01). "Selective reactions using allylic metals".
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TrisPotassium and Tetraphenylarsonium Hexacarbonylmetallates(1–) of Niobium and Tantalum
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of the tantalum-carbon bond, and β-hydrogen abstraction affords the alkylamine product.
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Schrock, Richard R. (1979-03-01). "Alkylidene complexes of niobium and tantalum".
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10.1002/(SICI)1521-3765(19980904)4:9<1687::AID-CHEM1687>3.0.CO;2-R
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10.1002/1521-3773(20020415)41:8<1389::AID-ANIE1389>3.0.CO;2-D
818: 309: 140: 39: 1088: 779: 743: 708: 673: 481: 418: 148: 1002: 869: 1137: 122: 35: 850:"Direct, Catalytic Hydroaminoalkylation of Unactivated Olefins with 357: 326: 282: 231: 212: 131: 108: 53: 52: 175:. An example of this is the first transition metal trihydride, 1109: 801:
Clerici, Mario G.; Maspero, Federico (1980-01-01). "Catalytic
121:. They effect a number of reactions including: olefinations, 300:
Organotantalum compounds are invoked as intermediates in C-
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metathesis, hydroaminoalkylation of olefins, and conjugate
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Chemistry of compounds containing a carbon-to-tantalum bond
186:. More soluble and better developed are derivatives of 592:
Acta Crystallographica Section C: Structural Chemistry
560:. Inorganic Syntheses. Vol. 16. pp. 68–73. 1774: 151:react with tantalum alkylidene complexes to yield 848:Herzon, Seth B.; Hartwig, John F. (2007-05-01). 805:-Alkylation of Secondary Amines with Alkenes". 113:Synthesis of Tantalum Monoalkylidene Complexes 1121: 8: 331:Hartwig hydroaminoalkylation reaction scheme 76:Salts of are prepared by alkylation of TaF 1128: 1114: 1106: 362:Purposed mechanism of hydroaminoalkylation 1140:with other elements in the periodic table 885: 400: 398: 396: 249:Treatment of tantalum pentachloride with 858:Journal of the American Chemical Society 732:Journal of the American Chemical Society 697:Journal of the American Chemical Society 662:Journal of the American Chemical Society 470:Journal of the American Chemical Society 136:Tantalum Alkylidene Promoted Olefination 18: 912:Angewandte Chemie International Edition 392: 1157: 538: 528: 955:European Journal of Organic Chemistry 217:Tantalum Alkylidene Olefin Metathesis 7: 1799:Academic research, no widespread use 245:Tantalum arenes and alkyne complexes 276:Tantalum-alkyne complexes catalyze 49:Classes of organotantalum compounds 371:Organotantalum reagents arise via 222:Tantalum carbonyls and isocyanides 117:Tantalum alkylidene complexes are 14: 343:of the bisamide, which forms the 1691: 1610: 1542: 1447: 1147: 768:The Journal of Organic Chemistry 507:. Vol. 36. pp. 52–57. 635:Coordination Chemistry Reviews 505:Inorganic Syntheses: Volume 36 1: 407:Accounts of Chemical Research 1847: 566:10.1002/9780470132470.ch21 513:10.1002/9781118744994.ch11 241:complexes are also known. 188:pentamethylcyclopentadiene 159:Cyclopentadienyl complexes 1688: 1607: 1159: 1155: 1145: 647:10.1016/j.ccr.2009.05.014 604:10.1107/S2053229619000834 165:salt metathesis reactions 1831:Organometallic chemistry 296:Tantalum-amido complexes 287:Utimoto's Synthesis of ( 169:sodium cyclopentadienide 62:Alkyl and aryl complexes 28:Organotantalum chemistry 1794:Many uses in chemistry 1789:Core organic chemistry 967:10.1002/ejoc.201400082 924:10.1002/anie.200903656 363: 341:β-hydrogen abstraction 332: 292: 218: 173:tantalum pentachloride 137: 114: 58: 24: 361: 330: 286: 267:aluminium trichloride 237:A number of tantalum 216: 135: 112: 56: 22: 819:10.1055/s-1980-29002 347:. Subsequent olefin 101:Alkylidene complexes 30:is the chemistry of 23:Tantalum-Carbon Bond 1089:10.1021/cr00022a010 780:10.1021/jo00293a008 744:10.1021/ja00255a056 709:10.1021/ja00511a064 674:10.1021/ja00819a047 482:10.1021/ja00452a064 419:10.1021/ar50135a004 278:cyclotrimerizations 67:Pentamethyltantalum 1826:Tantalum compounds 854:-Alkyl Arylamines" 364: 333: 293: 291:)-Allylic Alcohols 219: 138: 115: 59: 32:chemical compounds 25: 1813: 1812: 1769: 1768: 1034:Angewandte Chemie 1003:10.1021/ol400729v 961:(13): 2790–2797. 918:(44): 8361–8365. 870:10.1021/ja0718366 864:(21): 6690–6691. 738:(21): 6525–6527. 703:(17): 5094–5095. 668:(12): 4009–4011. 575:978-0-470-13247-0 522:978-1-118-74499-4 476:(10): 3519–3520. 251:hexamethylbenzene 226:Reduction of TaCl 153:olefin metathesis 1838: 1805: 1800: 1795: 1790: 1695: 1694: 1614: 1613: 1546: 1545: 1451: 1450: 1148: 1130: 1123: 1116: 1107: 1101: 1100: 1083:(6): 2207–2293. 1077:Chemical Reviews 1072: 1066: 1065: 1040:(8): 1447–1450. 1029: 1023: 1022: 997:(9): 2182–2185. 985: 979: 978: 950: 944: 943: 906: 900: 899: 889: 845: 839: 838: 798: 792: 791: 774:(6): 1707–1708. 762: 756: 755: 727: 721: 720: 692: 686: 685: 657: 651: 650: 641:(5–6): 402–419. 630: 624: 623: 586: 580: 579: 553: 547: 546: 540: 536: 534: 526: 500: 494: 493: 464: 458: 457: 437: 431: 430: 402: 345:metallaaziridine 306:secondary amines 69:was reported by 1846: 1845: 1841: 1840: 1839: 1837: 1836: 1835: 1816: 1815: 1814: 1809: 1808: 1803: 1798: 1793: 1788: 1770: 1692: 1611: 1543: 1448: 1141: 1134: 1104: 1074: 1073: 1069: 1031: 1030: 1026: 991:Organic Letters 987: 986: 982: 952: 951: 947: 908: 907: 903: 847: 846: 842: 800: 799: 795: 764: 763: 759: 729: 728: 724: 694: 693: 689: 659: 658: 654: 632: 631: 627: 588: 587: 583: 576: 555: 554: 550: 537: 527: 523: 502: 501: 497: 466: 465: 461: 439: 438: 434: 404: 403: 394: 390: 382: 373:transmetalation 369: 367:Transmetalation 339:may proceed by 337:catalytic cycle 319: 315: 298: 272: 260: 256: 247: 229: 224: 209: 205: 201: 197: 193: 190:such as Cp*TaCl 184: 180: 161: 103: 95: 91: 79: 71:Richard Schrock 64: 51: 17: 12: 11: 5: 1844: 1842: 1834: 1833: 1828: 1818: 1817: 1811: 1810: 1807: 1806: 1801: 1796: 1791: 1786: 1783:Chemical bonds 1779: 1778: 1776: 1772: 1771: 1767: 1766: 1761: 1756: 1751: 1746: 1741: 1736: 1731: 1726: 1721: 1716: 1711: 1706: 1701: 1696: 1689: 1686: 1685: 1680: 1675: 1670: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1620: 1615: 1608: 1605: 1604: 1600: 1599: 1596: 1593: 1590: 1587: 1584: 1581: 1578: 1575: 1572: 1569: 1566: 1563: 1558: 1555: 1552: 1547: 1540: 1535: 1531: 1530: 1527: 1522: 1517: 1512: 1507: 1502: 1497: 1492: 1487: 1482: 1477: 1472: 1467: 1462: 1457: 1452: 1445: 1440: 1434: 1433: 1428: 1423: 1418: 1413: 1408: 1403: 1398: 1393: 1388: 1383: 1378: 1373: 1368: 1363: 1358: 1353: 1351: 1346: 1340: 1339: 1334: 1329: 1324: 1319: 1314: 1309: 1304: 1299: 1294: 1289: 1284: 1279: 1274: 1269: 1264: 1259: 1257: 1252: 1246: 1245: 1240: 1235: 1230: 1225: 1220: 1215: 1210: 1204: 1203: 1200: 1195: 1190: 1185: 1180: 1175: 1170: 1164: 1163: 1160: 1158: 1156: 1154: 1146: 1143: 1142: 1135: 1133: 1132: 1125: 1118: 1110: 1103: 1102: 1067: 1024: 980: 945: 901: 840: 813:(4): 305–306. 793: 757: 722: 687: 652: 625: 598:(2): 135–140. 590:Ta(CNDipp)6". 581: 574: 548: 539:|journal= 521: 495: 459: 432: 391: 389: 386: 381: 378: 368: 365: 317: 313: 297: 294: 270: 258: 254: 246: 243: 227: 223: 220: 207: 203: 199: 195: 191: 182: 178: 160: 157: 102: 99: 98: 97: 96:→ Li + 5 LiF 93: 89: 82:methyl lithium 77: 63: 60: 57:Structure of . 50: 47: 15: 13: 10: 9: 6: 4: 3: 2: 1843: 1832: 1829: 1827: 1824: 1823: 1821: 1802: 1797: 1792: 1787: 1784: 1781: 1780: 1777: 1773: 1765: 1762: 1760: 1757: 1755: 1752: 1750: 1747: 1745: 1742: 1740: 1737: 1735: 1732: 1730: 1727: 1725: 1722: 1720: 1717: 1715: 1712: 1710: 1707: 1705: 1702: 1700: 1697: 1690: 1687: 1684: 1681: 1679: 1676: 1674: 1671: 1669: 1666: 1664: 1661: 1659: 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 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1191: 1189: 1186: 1184: 1181: 1179: 1176: 1174: 1171: 1169: 1166: 1165: 1161: 1153: 1150: 1149: 1144: 1139: 1136:Compounds of 1131: 1126: 1124: 1119: 1117: 1112: 1111: 1108: 1098: 1094: 1090: 1086: 1082: 1078: 1071: 1068: 1063: 1059: 1055: 1051: 1047: 1043: 1039: 1035: 1028: 1025: 1020: 1016: 1012: 1008: 1004: 1000: 996: 992: 984: 981: 976: 972: 968: 964: 960: 956: 949: 946: 941: 937: 933: 929: 925: 921: 917: 913: 905: 902: 897: 893: 888: 883: 879: 875: 871: 867: 863: 859: 855: 853: 844: 841: 836: 832: 828: 824: 820: 816: 812: 808: 804: 797: 794: 789: 785: 781: 777: 773: 769: 761: 758: 753: 749: 745: 741: 737: 733: 726: 723: 718: 714: 710: 706: 702: 698: 691: 688: 683: 679: 675: 671: 667: 663: 656: 653: 648: 644: 640: 636: 629: 626: 621: 617: 613: 609: 605: 601: 597: 593: 585: 582: 577: 571: 567: 563: 559: 552: 549: 544: 532: 524: 518: 514: 510: 506: 499: 496: 491: 487: 483: 479: 475: 471: 463: 460: 455: 451: 447: 443: 436: 433: 428: 424: 420: 416: 413:(3): 98–104. 412: 408: 401: 399: 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Eur. J 441: 435: 410: 406: 383: 380:Applications 370: 353:protonolysis 334: 312:using Ta(NMe 299: 288: 275: 248: 236: 225: 162: 139: 119:nucleophilic 116: 104: 75: 65: 27: 26: 448:(9): 1687. 322:alkylamines 234:complexes. 1820:Categories 388:References 302:alkylation 239:isocyanide 155:products. 127:allylation 1785:to carbon 1097:0009-2665 1054:1521-3757 1011:1523-7060 975:1099-0690 932:1521-3773 878:0002-7863 827:0039-7881 807:Synthesis 788:0022-3263 752:0002-7863 717:0002-7863 682:0002-7863 541:ignored ( 531:cite book 490:0002-7863 427:0001-4842 349:insertion 310:1-alkenes 263:aluminium 202:, and Cp* 145:propylene 73:in 1974. 1062:19750774 1019:23600625 940:19787670 896:17474747 835:94579838 620:73450348 612:30720451 141:Ethylene 92:+ 6 LiCH 40:tantalum 1603:  887:2590937 149:styrene 1775:Legend 1138:carbon 1095:  1060:  1052:  1017:  1009:  973:  938:  930:  894:  884:  876:  833:  825:  786:  750:  715:  680:  618:  610:  572:  519:  488:  425:  269:gives 265:, and 147:, and 123:olefin 80:using 36:carbon 831:S2CID 616:S2CID 308:with 232:arene 194:, Cp* 1093:ISSN 1058:PMID 1050:ISSN 1015:PMID 1007:ISSN 971:ISSN 959:2014 936:PMID 928:ISSN 892:PMID 874:ISSN 823:ISSN 811:1980 784:ISSN 748:ISSN 713:ISSN 678:ISSN 608:PMID 570:ISBN 543:help 517:ISBN 486:ISSN 423:ISSN 335:The 198:TaCl 171:and 38:-to- 1749:CEs 1744:CCf 1739:CBk 1734:CCm 1729:CAm 1724:CPu 1719:CNp 1709:CPa 1704:CTh 1683:CYb 1678:CTm 1673:CEr 1668:CHo 1663:CDy 1658:CTb 1653:CGd 1648:CEu 1643:CSm 1638:CPm 1633:CNd 1628:CPr 1623:CCe 1618:CLa 1598:Og 1595:Ts 1592:Lv 1589:Mc 1586:Fl 1583:Nh 1580:Cn 1577:Rg 1574:Ds 1571:Mt 1568:Hs 1565:Bh 1561:CSg 1557:Db 1554:Rf 1538:CRa 1534:Fr 1529:Rn 1525:CAt 1520:CPo 1515:CBi 1510:CPb 1505:CTl 1500:CHg 1495:CAu 1490:CPt 1485:CIr 1480:COs 1475:CRe 1465:CTa 1460:CHf 1455:CLu 1443:CBa 1438:CCs 1431:CXe 1421:CTe 1416:CSb 1411:CSn 1406:CIn 1401:CCd 1396:CAg 1391:CPd 1386:CRh 1381:CRu 1376:CTc 1371:CMo 1366:CNb 1361:CZr 1349:CSr 1344:CRb 1337:CKr 1332:CBr 1327:CSe 1322:CAs 1317:CGe 1312:CGa 1307:CZn 1302:CCu 1297:CNi 1292:CCo 1287:CFe 1282:CMn 1277:CCr 1267:CTi 1262:CSc 1255:CCa 1243:CAr 1238:CCl 1223:CSi 1218:CAl 1213:CMg 1208:CNa 1202:Ne 1173:CBe 1168:CLi 1162:He 1085:doi 1042:doi 1038:114 999:doi 963:doi 920:doi 882:PMC 866:doi 862:129 815:doi 776:doi 740:doi 736:109 705:doi 701:101 670:doi 643:doi 639:254 600:doi 562:doi 509:doi 478:doi 450:doi 415:doi 304:of 261:), 206:TaH 181:TaH 167:of 88:TaF 1822:: 1764:No 1759:Md 1754:Fm 1714:CU 1699:Ac 1550:Lr 1470:CW 1426:CI 1356:CY 1272:CV 1250:CK 1233:CS 1228:CP 1198:CF 1193:CO 1188:CN 1183:CC 1178:CB 1152:CH 1091:. 1081:93 1079:. 1056:. 1048:. 1036:. 1013:. 1005:. 995:15 993:. 969:. 957:. 934:. 926:. 916:48 914:. 890:. 880:. 872:. 860:. 856:. 829:. 821:. 809:. 782:. 772:55 770:. 746:. 734:. 711:. 699:. 676:. 666:96 664:. 637:. 614:. 606:. 596:75 594:. 568:. 535:: 533:}} 529:{{ 515:. 484:. 474:99 472:. 444:. 421:. 411:12 409:. 395:^ 351:, 324:: 273:. 257:Me 253:(C 210:. 177:Cp 143:, 84:: 1129:e 1122:t 1115:v 1099:. 1087:: 1064:. 1044:: 1021:. 1001:: 977:. 965:: 942:. 922:: 898:. 868:: 852:N 837:. 817:: 803:C 790:. 778:: 754:. 742:: 719:. 707:: 684:. 672:: 649:. 645:: 622:. 602:: 578:. 564:: 545:) 525:. 511:: 492:. 480:: 456:. 452:: 446:4 429:. 417:: 318:5 316:) 314:2 289:E 271:2 259:6 255:6 228:5 208:3 204:2 200:2 196:2 192:4 183:3 179:2 94:3 90:5 78:5

Index


chemical compounds
carbon
tantalum
chemical bond

Pentamethyltantalum
Richard Schrock
methyl lithium
Tantalum alkylidine synthesis
nucleophilic
olefin
allylation

Ethylene
propylene
styrene
olefin metathesis
salt metathesis reactions
sodium cyclopentadienide
tantalum pentachloride
Cp2TaH3
pentamethylcyclopentadiene

arene
isocyanide
hexamethylbenzene
aluminium
aluminium trichloride
cyclotrimerizations

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