Reactions of Alkynes with [Fe2(CO)6(-PPh2){
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- 作者：Simon Doherty ; Graeme Hogarth ; Mark Waugh ; William Clegg ; and Mark R. J. Elsegood
- 刊名：Organometallics
- 出版年：2000
- 出版时间：October 30, 2000
- 年：2000
- 卷：19
- 期：22
- 页码：4557 - 4562
- 全文大小：105K
- 年卷期：v.19,no.22(October 30, 2000)
- ISSN：1520-6041
文摘
Reaction of [Fe2(CO)6(
-PPh2){-
1:2
,
-(H)C=C=C
H2}] (1) with PhC
CPh results inallenyl-alkyne-phosphido coupling to give [Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Ph)C(Ph)C(H)C(=CH2)PPh2}] (2), bridged by a diphenylvinylphosphine-substituted vinyl carbene.Under similar conditions 1 reacts with PhCCMe to give an equal mixture of the two possibleregioisomers, [Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Ph)C(Me)C(H)C(=CH2)PPh2}] (3a) and[Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Me)C(Ph)C(H)C(=CH2)PPh2}] (3b). In contrast, 1reacts with 2 equiv of PhCCH to give the vinyl carbene bridged 47a10001">[Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-(Ph)CCC(H)MeCH=CPh C(PPh2)}] (4), which results from a complex sequenceof carbon-carbon and carbon-phosphorus bond formation and hydrogen migration steps.
-PPh2){-1:2,-(H)C=C=CH2}] (1) with PhCCPh results inallenyl-alkyne-phosphido coupling to give [Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Ph)C(Ph)C(H)C(=CH2)PPh2}] (2), bridged by a diphenylvinylphosphine-substituted vinyl carbene.Under similar conditions 1 reacts with PhCCMe to give an equal mixture of the two possibleregioisomers, [Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Ph)C(Me)C(H)C(=CH2)PPh2}] (3a) and[Fe2(CO)6(-PPh2){-1(P):3(C):1(C)-C(Me)C(Ph)C(H)C(=CH2)PPh2}] (3b). In contrast, 1reacts with 2 equiv of PhCCH to give the vinyl carbene bridged -PPh2){-1(P):3(C):1(C)-(Ph)C