Synthesis and reactivity of selenium functionalised allylidynes and propargylidynes†
Anthony F.
Hill, 
*a
Jas S.
Ward
a
*a
Jas S.
Ward
a
Abstract
The reactions of the trimethylsilylpropargylidyne [W(![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CCCSiMe3)(CO)2(Tp*)] (1: Tp* = hydrotris(dimethylpyrazolyl)borate) towards selenium centred reagents when treated with tetrabutylammonium fluoride (TBAF) were explored in order to prepare alkynylselenolato propargylidynes, e.g., [W(CCCSePh)(CO)2(Tp*)]. Treating 1 with TBAF and PhSeSePh resulted in E and Z isomers of the vinylcarbyne (allylidyne) complex [W{CC(SePh)![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CHSePh}(CO)2(Tp*)] in addition to traces of the trisubstituted derivative [W{CC(SePh)C(SePh)2}(CO)2(Tp*)]. Reactions with PhSeCl resulted in the isolation of bimetallic bis-substituted allylidyne complex [(Tp*)(CO)2WCC(SePh)C(SePh)CCCW(CO)2(CO)2(Tp*)] as well as the desired selenolatopropargylidyne [W(CCCSePh)(CO)2(Tp*)].
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