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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".
331:. The chemistry developed by Maspero was later brought to fruition when Hartwig and Herzon reported the hydroaminoalkylation of olefins to form 56:. A wide variety of compound have been reported, initially with cyclopentadienyl and CO ligands. Oxidation states vary from Ta(V) to Ta(-I). 584: 531: 464: 1131: 671:
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
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Clerici, Mario G.; Maspero, Federico (1980-01-01). "Catalytic
132:. They effect a number of reactions including: olefinations, 311:
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
197:. More soluble and better developed are derivatives of 603:
Acta Crystallographica Section C: Structural Chemistry
571:. Inorganic Syntheses. Vol. 16. pp. 68–73. 1785: 162:react with tantalum alkylidene complexes to yield 859:Herzon, Seth B.; Hartwig, John F. (2007-05-01). 816:-Alkylation of Secondary Amines with Alkenes". 124:Synthesis of Tantalum Monoalkylidene Complexes 1132: 8: 342:Hartwig hydroaminoalkylation reaction scheme 87:Salts of are prepared by alkylation of TaF 1139: 1125: 1117: 373:Purposed mechanism of hydroaminoalkylation 1151:with other elements in the periodic table 896: 411: 409: 407: 260:Treatment of tantalum pentachloride with 869:Journal of the American Chemical Society 743:Journal of the American Chemical Society 708:Journal of the American Chemical Society 673:Journal of the American Chemical Society 481:Journal of the American Chemical Society 147:Tantalum Alkylidene Promoted Olefination 29: 923:Angewandte Chemie International Edition 403: 1168: 549: 539: 966:European Journal of Organic Chemistry 228:Tantalum Alkylidene Olefin Metathesis 7: 1810:Academic research, no widespread use 256:Tantalum arenes and alkyne complexes 287:Tantalum-alkyne complexes catalyze 60:Classes of organotantalum compounds 382:Organotantalum reagents arise via 233:Tantalum carbonyls and isocyanides 128:Tantalum alkylidene complexes are 25: 354:of the bisamide, which forms the 1702: 1621: 1553: 1458: 1158: 779:The Journal of Organic Chemistry 518:. Vol. 36. pp. 52–57. 646:Coordination Chemistry Reviews 516:Inorganic Syntheses: Volume 36 1: 418:Accounts of Chemical Research 1858: 577:10.1002/9780470132470.ch21 524:10.1002/9781118744994.ch11 252:complexes are also known. 199:pentamethylcyclopentadiene 170:Cyclopentadienyl complexes 1699: 1618: 1170: 1166: 1156: 658:10.1016/j.ccr.2009.05.014 615:10.1107/S2053229619000834 176:salt metathesis reactions 1842:Organometallic chemistry 307:Tantalum-amido complexes 298:Utimoto's Synthesis of ( 180:sodium cyclopentadienide 73:Alkyl and aryl complexes 39:Organotantalum chemistry 1805:Many uses in chemistry 1800:Core organic chemistry 978:10.1002/ejoc.201400082 935:10.1002/anie.200903656 374: 352:β-hydrogen abstraction 343: 303: 229: 184:tantalum pentachloride 148: 125: 69: 35: 372: 341: 297: 278:aluminium trichloride 248:A number of tantalum 227: 146: 123: 67: 33: 830:10.1055/s-1980-29002 358:. Subsequent olefin 112:Alkylidene complexes 41:is the chemistry of 34:Tantalum-Carbon Bond 1100:10.1021/cr00022a010 791:10.1021/jo00293a008 755:10.1021/ja00255a056 720:10.1021/ja00511a064 685:10.1021/ja00819a047 493:10.1021/ja00452a064 430:10.1021/ar50135a004 289:cyclotrimerizations 78:Pentamethyltantalum 1837:Tantalum compounds 865:-Alkyl Arylamines" 375: 344: 304: 302:)-Allylic Alcohols 230: 149: 126: 70: 43:chemical compounds 36: 1824: 1823: 1780: 1779: 1045:Angewandte Chemie 1014:10.1021/ol400729v 972:(13): 2790–2797. 929:(44): 8361–8365. 881:10.1021/ja0718366 875:(21): 6690–6691. 749:(21): 6525–6527. 714:(17): 5094–5095. 679:(12): 4009–4011. 586:978-0-470-13247-0 533:978-1-118-74499-4 487:(10): 3519–3520. 262:hexamethylbenzene 237:Reduction of TaCl 164:olefin metathesis 16:(Redirected from 1849: 1816: 1811: 1806: 1801: 1706: 1705: 1625: 1624: 1557: 1556: 1462: 1461: 1159: 1141: 1134: 1127: 1118: 1112: 1111: 1094:(6): 2207–2293. 1088:Chemical Reviews 1083: 1077: 1076: 1051:(8): 1447–1450. 1040: 1034: 1033: 1008:(9): 2182–2185. 996: 990: 989: 961: 955: 954: 917: 911: 910: 900: 856: 850: 849: 809: 803: 802: 785:(6): 1707–1708. 773: 767: 766: 738: 732: 731: 703: 697: 696: 668: 662: 661: 652:(5–6): 402–419. 641: 635: 634: 597: 591: 590: 564: 558: 557: 551: 547: 545: 537: 511: 505: 504: 475: 469: 468: 448: 442: 441: 413: 356:metallaaziridine 317:secondary amines 80:was reported by 21: 1857: 1856: 1852: 1851: 1850: 1848: 1847: 1846: 1827: 1826: 1825: 1820: 1819: 1814: 1809: 1804: 1799: 1781: 1703: 1622: 1554: 1459: 1152: 1145: 1115: 1085: 1084: 1080: 1042: 1041: 1037: 1002:Organic Letters 998: 997: 993: 963: 962: 958: 919: 918: 914: 858: 857: 853: 811: 810: 806: 775: 774: 770: 740: 739: 735: 705: 704: 700: 670: 669: 665: 643: 642: 638: 599: 598: 594: 587: 566: 565: 561: 548: 538: 534: 513: 512: 508: 477: 476: 472: 450: 449: 445: 415: 414: 405: 401: 393: 384:transmetalation 380: 378:Transmetalation 350:may proceed by 348:catalytic cycle 330: 326: 309: 283: 271: 267: 258: 240: 235: 220: 216: 212: 208: 204: 201:such as Cp*TaCl 195: 191: 172: 114: 106: 102: 90: 82:Richard Schrock 75: 62: 28: 23: 22: 15: 12: 11: 5: 1855: 1853: 1845: 1844: 1839: 1829: 1828: 1822: 1821: 1818: 1817: 1812: 1807: 1802: 1797: 1794:Chemical bonds 1790: 1789: 1787: 1783: 1782: 1778: 1777: 1772: 1767: 1762: 1757: 1752: 1747: 1742: 1737: 1732: 1727: 1722: 1717: 1712: 1707: 1700: 1697: 1696: 1691: 1686: 1681: 1676: 1671: 1666: 1661: 1656: 1651: 1646: 1641: 1636: 1631: 1626: 1619: 1616: 1615: 1611: 1610: 1607: 1604: 1601: 1598: 1595: 1592: 1589: 1586: 1583: 1580: 1577: 1574: 1569: 1566: 1563: 1558: 1551: 1546: 1542: 1541: 1538: 1533: 1528: 1523: 1518: 1513: 1508: 1503: 1498: 1493: 1488: 1483: 1478: 1473: 1468: 1463: 1456: 1451: 1445: 1444: 1439: 1434: 1429: 1424: 1419: 1414: 1409: 1404: 1399: 1394: 1389: 1384: 1379: 1374: 1369: 1364: 1362: 1357: 1351: 1350: 1345: 1340: 1335: 1330: 1325: 1320: 1315: 1310: 1305: 1300: 1295: 1290: 1285: 1280: 1275: 1270: 1268: 1263: 1257: 1256: 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1232: 1230: 1227: 1225: 1222: 1220: 1217: 1216: 1212: 1210: 1207: 1205: 1202: 1200: 1197: 1195: 1192: 1190: 1187: 1185: 1182: 1180: 1177: 1176: 1172: 1164: 1161: 1160: 1155: 1150: 1147:Compounds of 1142: 1137: 1135: 1130: 1128: 1123: 1122: 1119: 1109: 1105: 1101: 1097: 1093: 1089: 1082: 1079: 1074: 1070: 1066: 1062: 1058: 1054: 1050: 1046: 1039: 1036: 1031: 1027: 1023: 1019: 1015: 1011: 1007: 1003: 995: 992: 987: 983: 979: 975: 971: 967: 960: 957: 952: 948: 944: 940: 936: 932: 928: 924: 916: 913: 908: 904: 899: 894: 890: 886: 882: 878: 874: 870: 866: 864: 855: 852: 847: 843: 839: 835: 831: 827: 823: 819: 815: 808: 805: 800: 796: 792: 788: 784: 780: 772: 769: 764: 760: 756: 752: 748: 744: 737: 734: 729: 725: 721: 717: 713: 709: 702: 699: 694: 690: 686: 682: 678: 674: 667: 664: 659: 655: 651: 647: 640: 637: 632: 628: 624: 620: 616: 612: 608: 604: 596: 593: 588: 582: 578: 574: 570: 563: 560: 555: 543: 535: 529: 525: 521: 517: 510: 507: 502: 498: 494: 490: 486: 482: 474: 471: 466: 462: 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Eur. J 452: 446: 421: 417: 394: 391:Applications 381: 364:protonolysis 345: 323:using Ta(NMe 310: 299: 286: 259: 247: 236: 173: 150: 130:nucleophilic 127: 115: 86: 76: 38: 37: 459:(9): 1687. 333:alkylamines 245:complexes. 1831:Categories 399:References 313:alkylation 250:isocyanide 166:products. 138:allylation 1796:to carbon 1108:0009-2665 1065:1521-3757 1022:1523-7060 986:1099-0690 943:1521-3773 889:0002-7863 838:0039-7881 818:Synthesis 799:0022-3263 763:0002-7863 728:0002-7863 693:0002-7863 552:ignored ( 542:cite book 501:0002-7863 438:0001-4842 360:insertion 321:1-alkenes 274:aluminium 213:, and Cp* 156:propylene 84:in 1974. 1073:19750774 1030:23600625 951:19787670 907:17474747 846:94579838 631:73450348 623:30720451 152:Ethylene 103:+ 6 LiCH 51:tantalum 1614:  898:2590937 160:styrene 1786:Legend 1149:carbon 1106:  1071:  1063:  1028:  1020:  984:  949:  941:  905:  895:  887:  844:  836:  797:  761:  726:  691:  629:  621:  583:  530:  499:  436:  280:gives 276:, and 158:, and 134:olefin 91:using 47:carbon 842:S2CID 627:S2CID 319:with 243:arene 205:, Cp* 1104:ISSN 1069:PMID 1061:ISSN 1026:PMID 1018:ISSN 982:ISSN 970:2014 947:PMID 939:ISSN 903:PMID 885:ISSN 834:ISSN 822:1980 795:ISSN 759:ISSN 724:ISSN 689:ISSN 619:PMID 581:ISBN 554:help 528:ISBN 497:ISSN 434:ISSN 346:The 209:TaCl 182:and 49:-to- 1760:CEs 1755:CCf 1750:CBk 1745:CCm 1740:CAm 1735:CPu 1730:CNp 1720:CPa 1715:CTh 1694:CYb 1689:CTm 1684:CEr 1679:CHo 1674:CDy 1669:CTb 1664:CGd 1659:CEu 1654:CSm 1649:CPm 1644:CNd 1639:CPr 1634:CCe 1629:CLa 1609:Og 1606:Ts 1603:Lv 1600:Mc 1597:Fl 1594:Nh 1591:Cn 1588:Rg 1585:Ds 1582:Mt 1579:Hs 1576:Bh 1572:CSg 1568:Db 1565:Rf 1549:CRa 1545:Fr 1540:Rn 1536:CAt 1531:CPo 1526:CBi 1521:CPb 1516:CTl 1511:CHg 1506:CAu 1501:CPt 1496:CIr 1491:COs 1486:CRe 1476:CTa 1471:CHf 1466:CLu 1454:CBa 1449:CCs 1442:CXe 1432:CTe 1427:CSb 1422:CSn 1417:CIn 1412:CCd 1407:CAg 1402:CPd 1397:CRh 1392:CRu 1387:CTc 1382:CMo 1377:CNb 1372:CZr 1360:CSr 1355:CRb 1348:CKr 1343:CBr 1338:CSe 1333:CAs 1328:CGe 1323:CGa 1318:CZn 1313:CCu 1308:CNi 1303:CCo 1298:CFe 1293:CMn 1288:CCr 1278:CTi 1273:CSc 1266:CCa 1254:CAr 1249:CCl 1234:CSi 1229:CAl 1224:CMg 1219:CNa 1213:Ne 1184:CBe 1179:CLi 1173:He 1096:doi 1053:doi 1049:114 1010:doi 974:doi 931:doi 893:PMC 877:doi 873:129 826:doi 787:doi 751:doi 747:109 716:doi 712:101 681:doi 654:doi 650:254 611:doi 573:doi 520:doi 489:doi 461:doi 426:doi 315:of 272:), 217:TaH 192:TaH 178:of 99:TaF 1833:: 1775:No 1770:Md 1765:Fm 1725:CU 1710:Ac 1561:Lr 1481:CW 1437:CI 1367:CY 1283:CV 1261:CK 1244:CS 1239:CP 1209:CF 1204:CO 1199:CN 1194:CC 1189:CB 1163:CH 1102:. 1092:93 1090:. 1067:. 1059:. 1047:. 1024:. 1016:. 1006:15 1004:. 980:. 968:. 945:. 937:. 927:48 925:. 901:. 891:. 883:. 871:. 867:. 840:. 832:. 820:. 793:. 783:55 781:. 757:. 745:. 722:. 710:. 687:. 677:96 675:. 648:. 625:. 617:. 607:75 605:. 579:. 546:: 544:}} 540:{{ 526:. 495:. 485:99 483:. 455:. 432:. 422:12 420:. 406:^ 362:, 335:: 284:. 268:Me 264:(C 221:. 188:Cp 154:, 95:: 1140:e 1133:t 1126:v 1110:. 1098:: 1075:. 1055:: 1032:. 1012:: 988:. 976:: 953:. 933:: 909:. 879:: 863:N 848:. 828:: 814:C 801:. 789:: 765:. 753:: 730:. 718:: 695:. 683:: 660:. 656:: 633:. 613:: 589:. 575:: 556:) 536:. 522:: 503:. 491:: 467:. 463:: 457:4 440:. 428:: 329:5 327:) 325:2 300:E 282:2 270:6 266:6 239:5 219:3 215:2 211:2 207:2 203:4 194:3 190:2 105:3 101:5 89:5 20:)

Index

Organotantalum

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

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