Symmetrical 1,3-disubstituted tetraphenyldisilthianes a pearson “soft” acid-base match

Abstract Symmetrical disilthianes of the type M(C 6 H 5 ) 2 SiSSi(C 6 H 5 0 2 M(M  CH 3 ; CH 2  CH 3 , C 6 H 4 X; X  H, F, Cl, Br and CH 3 ) has been prepared by reaction of the appropriate chlorosilane in the presence of triethylamine with hydrogen sulfide. Selected alcoholysis attempts indicate that these symmetrical aromatic disilthianes are resistant to electrophylic cleavage of the SiSSi linkage. Physical properties of the new disithianes as well as their IR and PMR spectra are discussed.