Diphosphines, silyl-substituted

Silyl-substituted diphosphines are useful synthetic intermediates in the preparation of longer-chain linear and cyclopolyphosphines. They result through routes involving condensation and coupling (Scheme 17, equations 42 and 43)47. 

This class has been entered only by combination of methylenediphosphines with bifunctional reagents, such as substituted guanidines (82) (72CB2476) and silylated ureas (83) (84CZ402). Under some circumstances, the diphosphine may react with a second mole of urea to produce bicyclic products (84) (84AP1053). 

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