Abstract The cleavage of the silicon-phenyl bonds of 1, 2-di-tert-butyltetraphenyldisilane with hydrogen halides HCl, HBr and HI produces 1, 2-di-tert-butyltetrachlorodisilane, 1, 2-di-tert- butyltetrabromodisilane and 1, 2-di-tert-butyltetraiododisilane in good yields. t BuBr 2 SiSiBr 2 t Bu easily reacts with ZnF 2 in diethylether to form the tetrafluoroderivative. With trifluormethanesulfonicacid, two phenyl groups can be removed selectively from t BuPh 2 ...