COORDINATION ABILITY OF ALKYNYLPHOSPHINES RNP(C = C-R')3-N

被引:33
作者
LANG, H
ZSOLNAI, L
机构
[1] Anorganisch-Chemisches Institut, Universität Heidelberg, Heidelberg, D-6900
关键词
ALKYNYLPHOSPHINES; COBALT COMPLEXES;
D O I
10.1002/cber.19911240203
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Alkynylphosphines RP(C = C - R')2 (2) react with one equivalent of octacarbonyldicobalt to yield selectively the eta-2-pi side-on-coordinated alkyne complexes (R)(R' - C = C)P[(eta-2-C = C - R')Co2(CO)6] (6); with another equivalent of Co2(CO)8 the dicoordinated compounds (R)P[(eta-2-C = C - R')Co2(CO)6]2 (7) are obtained. 7 may also be synthesized directly by the reaction of 2 with two equivalents of Co2(CO)8. However, P(C = C - Ph)3 yields with two equivalents of Co2(CO)8 the cyclic Co2P2C2 system {(Ph - C = C)(R')P[(eta-2-C = C - Ph)Co2(CO)5]}2 (4) [R' = (eta-2-C = C - Ph)Co2(CO)6]. Decarbonylation of 6 a gives the six-membered cyclic compound {(Ph)(Ph - C = C)P[(eta-2-C = C - Ph)Co2(CO)5]}2 (8), while 6 b yields the cluster Co3(CO)9(mu-3-PtBu) (9). The structure of (tBu)P[(eta-2-C = C - H)Co2(CO)6]2 (7b) is elucidated by an X-ray analysis.
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页码:259 / 264
页数:6
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