Some oxidative addition reactions with a diphosphadibora[1.1.0]bicyclobutane: formation of cage compounds and of an unusual trinuclear coordination compound of palladium

Abstract

Diphosphadibora-bicyclo[1.1.0]butane ( 3) oxidatively adds the stannylene [(Me 3Si) 2CH] 2 Sn providing the cage compound 4 having a trigonal bipyramidally shaped P 2B 2Sn skeleton. Other low valent main group IV species such as GeCl 2·dioxane, Sn(NMe 2) 2, p-chlorophenylcarbene and even Cp 2Zr did not react. However, (Ph 3P) 2PtC 2H 4 adds 3 to its (Ph 3P) 2Pt fragment, and this leads to the cage compound 5 having a B 2P 2Pt skeleton. In contrast, the interaction between 3 and Pd(PPh 3) 4 yields two compounds: (Ph 3P) 2Pd( 3) 2 ( 6) is the first addition product while the second compound, (Ph 3P) 2Pd 3( 3) 2 ( 7) results in a slow reaction from 6 and Pd(PPh 3) 4. The structure of compound 7 shows a linear array of three Pd atoms which are bridged by four P atoms of the oxidatively added 3.