(BUTADIENE)(CYCLOPENTADIENYL)NIOBIUM COMPLEXES

被引：24

作者：

HERBERICH, GE ^{[1
]}

ENGLERT, U ^{[1
]}

LINN, K ^{[1
]}

ROOS, P ^{[1
]}

RUNSINK, J ^{[1
]}

机构：

[1] RHEIN WESTFAL TH AACHEN,INST ORGAN CHEM,W-5100 AACHEN,GERMANY

来源：

CHEMISCHE BERICHTE | 1991年 / 124卷 / 05期

关键词：

NIOBIUM COMPLEXES; CYCLOPENTADIENYL DERIVATIVES; BUTADIENE DERIVATIVES; ACETYLENE DERIVATIVES;

D O I：

10.1002/cber.19911240502

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The known bis(butadiene)(cyclopentadienyl)niobium complex (C5H4R)Nb(C4H6)2(1, R = H) exists in solution as a 1:1 mixture of a bis(cis-butadiene) isomer 1a and a (cis-butadiene)(transbutadiene) isomer 1 b. In solution the barrier to isomerisation is 80 +/- 2 kJ/mol. New derivatives 2 (R = Me) and 3 (R = SiMe3) of 1 are described. One of the butadiene ligands in 1-3 is readily substituted with CO, CNtBu, P(OMe)3, and PMe3. CpNb(PMe3)2(C4H6) (7) reacts with disubstituted acetylenes to form acetylene complexes CpNb(PMe3)(C4H6)(RC = CR') 8: R, R' = Ph, 9: R = Me, R' = Ph, and 10: R = Ph, R' = SiMe3). The structure of 9 resembles that of bent metallocene derivatives with the acetylene acting as a 2-e ligand.

引用

页码：975 / 980

页数：6

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