Six (chloromethylstanny1) methanes with structures CH2 (SnMe, C13-,)(SnMe, C13-,) with n= 0-3 and m= 0-2 have been prepared by chlorine-methyl exchange from bis (trimethylstanny1) methane or bis-(trivinylstanny1) methane. Four 2, 2-bis (chloromethylstannyl) propanes have been similarly prepared from 2, 2-bis (trimethylstannyl) propane. Correlations between'H and 13C magnetic resonance parameters have been ...