Abstract
The reaction between the phosphine-borane-stabilised dicarbanion complex [1,2-C6H4{CHP(BH3)Cy2}2][Li(THF)n]2 and Cp2Sn gives the unusual stannyl-stannylene [[1,2-C6H4{CHP(BH3)Cy2}2]Sn]2·1½PhMe, in which one dicarbanion ligand chelates a tin centre, while the other bridges a tin-tin bond. The stannylene centre is stabilised by an agostic-type B-H···Sn interaction.
Highlights
The reaction between the phosphine–borane-stabilised dicarbanion complex [1,2-C6H4{CHP(BH3)Cy2}2][Li(THF)n]2 and Cp2Sn gives the unusual stannyl–stannylene [[1,2-C6H4{CHP(BH3)Cy2}2]Sn]2Á121PhMe, in which one dicarbanion ligand chelates a tin centre, while the other bridges a tin–tin bond
The stannylene centre is stabilised by an agostic-type B–HÁ Á ÁSn interaction
We have recently shown that agostic-type B–HÁ Á ÁE interactions stabilise monomeric dialkylstannylenes, significantly disfavouring dimerisation to the corresponding distannene.[6]
Summary
The reaction between the phosphine–borane-stabilised dicarbanion complex [1,2-C6H4{CHP(BH3)Cy2}2][Li(THF)n]2 and Cp2Sn gives the unusual stannyl–stannylene [[1,2-C6H4{CHP(BH3)Cy2}2]Sn]2Á121PhMe, in which one dicarbanion ligand chelates a tin centre, while the other bridges a tin–tin bond. The stannylene centre is stabilised by an agostic-type B–HÁ Á ÁSn interaction.
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