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The reaction between two equivalents of {(Me 3 Si) 2 CH}(Ph)PH(BH 3 ) (1) and Bu 2 Mg, followed by two equivalents of BH 3 ·SMe 2 , gives the corresponding phosphido-bis(borane) complex, which may be crystallised as two distinct chemical species: the complex [{(Me 3 Si) 2 CH}(Ph)P(BH 3 ) 2 ] 2 Mg(THF) 4 ·THF (2a), and two different THF solvates (1 : 1 and 1 : 2) of the solvent-separated ion triples [{(Me 3 Si) 2 CH}(Ph)P(BH 3 ) 2 ] 2 [Mg(THF) 6 ]·THF (2b) and [{(Me 3 Si) 2 CH}(Ph)P(BH 3 ) 2 ] 2 [Mg(THF) 6 ]·2THF (2c). Similar reactions between two equivalents of 1 and either (4-tBuC 6 H 4 CH 2 ) 2 Ca(THF) 4 or [(Me 3 Si) 2 CH] 2 Sr(THF) 2 , followed by two equivalents of BH 3 ·SMe 2 , give the heavier alkali metal complexes [{(Me 3 Si) 2 CH}(Ph)P(BH 3 ) 2 ] 2 M(THF) 4 [M = Ca (3), Sr (4)]. Surprisingly, compounds 2a, 3 and 4 adopt almost identical structures in the solid state, which differ only in the geometrical arrangement of the phosphido-bis(borane) ligands and the hapticity of the borane groups.

Phosphido-bis(borane) complexes of the alkaline earth metals