Synthesis and properties of diphenylphosphanyl and di-isopropylphosphanyl triphenylsilanes and pentaphenyldisilanes

• A less hazardous synthetic pathway to ClSi 2 Ph 5 has been developed. • The previously unknown compounds ( i -Pr) 2 PSiPh 3 , Ph 2 PSi 2 Ph 5 , and ( i -Pr) 2 PSi 2 Ph 5 were prepared. • Single crystal structure analyses of ClSi 2 Ph 5 and ( i -Pr) 2 PSiPh 3 were carried out. A new, less hazardous synthetic pathway to chloropentaphenyldisilane, ClSi 2 Ph 5 , has been developed. Starting from this compound and lithium diorganophosphides, the two previously unknown diorganophosphanyldisilanes (diphenylphosphanyl)pentaphenyldisilane, Ph 2 PSi 2 Ph 5 , and (di-isopropylphosphanyl)pentaphenyldisilane, ( i -Pr) 2 PSi 2 Ph 5 , were prepared. To compare these compounds with the corresponding monosilanes, the known (diphenylphosphanyl)triphenylsilane, Ph 2 PSiPh 3 , and the unknown (di-isopropylphosphanyl)triphenylsilane, ( i -Pr) 2 PSiPh 3 , were prepared, too. The former was prepared via new synthetic routes. The compounds were characterized with IR-, Raman-, 31 P-, 29 Si-, and 1 H NMR spectroscopy and melting point determination. Single crystal structure analyses of ClSi 2 Ph 5 and ( i -Pr) 2 PSiPh 3 were carried out and confirm the results presented.