4-PHENYL-1,2,3,5-DITHIADIAZOLYL - A NOVEL COUPLING REAGENT FOR THE FORMATION OF E-E BONDS (E = C, P, SI)

[PhCNSSN]2 reacts under mild conditions with molecules containing bond s of the types P-Cl (Ph2PCl and PhPCl2), Si-Br (Me3SiBr) and activated C-Cl or C-Br (ortho-chloranil or MeCOBr) with the formation of [PhCNS SN]X (X = Cl or Br) and the corresponding E-E (E = P, Si or C) bonded compounds; the application of dithiadiazolyl radicals as coupling reag ents is discussed in the context of the strength of the E-Hal bond.