A [C1 + C2] route to propargylidyne complexes†
Anthony F.
Hill 
*a
and
Richard A.
Manzano
a
*a
and
Richard A.
Manzano
a
Abstract
The reactions of [W(![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CBr)(CO)2(Tp*)] (Tp* = hydrotris(dimethylpyrazolyl)borate) with a range of terminal alkynes (RCCH), mediated by [Pd(PPh3)4] and CuI, afford new proparylidynes [W(C–CCR)(CO)2(Tp*)] [R = tBu, C6H4X (X = H, NH2, NO2), ferrocenyl, APh3 (A = C, Si, Ge), B(O2CCH2)2NMe]. Similar treatment of [W(CBr)(CO)2(Tp*)] with Ph2Si(CCH)2 affords the ditungstaoctatetrayne [W2(μ-C6)(CO)4(Tp*)2] while the bimetallic complex [W2{μ-(CCC)2SiPh2}(CO)4(Tp*)2], which is obtained from [W(CBr)(CO)2(Tp*)] and Ph2Si(CCSnPh3)2, reacts with [AuCl(THT)] (THT = tetrahydrothiophene) to provide the tetrametallic complex [W2Au2{μ-(CCC)2SiPh2}Cl2(CO)4(Tp*)2].
![Graphical abstract: A [C1 + C2] route to propargylidyne complexes](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C9DT00876D&imageInfo.ImageIdentifier.Year=2019)
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