REACTIONS WITH PRIMARY STANNYLPHOSPHINES - SYNTHESIS OF OPEN-CHAIN AND CYCLIC-OLIGOMERIC TIN PHOSPHORUS-COMPOUNDS

Metathetical reactions of P-lithio salts of sterically crowded primary stannylphosphines (t)Bu(3)SnPH(2) and (t)Bu(2)Sn(PH2)(2) with organoc hlorosilanes and -stannanes were investigated. Reactions of (t)Bu(3)Sn PHLi (I) with dichlorides R(2)ECl(2) or (R(2)SnCl)(2)PH yield the seco ndary stannylphosphines ((t)Bu(3)SnPH)(2)ER(2) (III: E = Si, R = Me; I V: E = Sn, R = (t)Bu) and ((t)Bu(3)SnPHSn(t)Bu(2))(2)PH (V), respectiv ely. In the corresponding reaction of I with Me(2)SnCl(2), the cyclic tertiary stannylphosphine (Me(2)SnPSn(t)Bu(3))(2) (VI) is formed by co ndensation of (t)Bu(3)SnPH(2). Cyclocondensations yielding tertiary st annylphosphines also occur in the salt reactions of chlorostannanes or -silanes with the dilithio compound (t)Bu(2)Sn(PHLi)(2) (II). With Me (3)SnCl, the P,P'-bis(stannyl)-subst. diphosphadistannetane ((t)Bu(2)S nPSnMe(3))(2) (VII) is obtained. Me(3)SiCl reacts to give the homologo us P,P'-bis(silyl) derivative ((t)Bu(2)SnPSiMe(3))(2) (VIII). Some pro perties of these new compounds are reported.