Et3N in benzene byproducts: Et3N*HCl; hot soln. of ligand in C6H6 was added dropwise with stirring to hot soln. of Sn compd. in C6H6; mixt. was refluxed for 2 h; Et3N was added; refluxed for 1.5 h; cooled to room temp.; filtered; volatiles removed and dried (vac.); extd. (hexane); hot filtered; evapd.; recrystd. (acetone); slowly evapd.; elem. anal.;