A study of trialkyltin β‐aryl‐β‐triphenylgermyl propionates

Twenty new compounds of the form Ph 3 GeCHArCH 2 COOSnR 3 (R = n‐Bu, cyclohexyl; Ar = substituted phenyl) have been synthesized. Their structures were characterized by IR and 119 Sn and 1 H NMR spectroscopy. The compounds are five‐coordinated carboxylate bridged polymers when R = n– Bu; when R = cyclohexyl (Cy) they are four‐coordinate. 119 Sn NMR measurements of chemical shift for the two series of compounds have shown that there is a good linear relationship for the chemical shift of 119 Sn NMR between the tributyltin and tricyclohexyltin propionates, viz. δ 119 Sn(Bu 3 Sn) = 1.0474 δ 119 Sn(Cy 3 Sn) + 95.8076, n = 5, r = 0.993. The structure of one compound was determined by X‐ray diffraction. It exists as a monomeric four‐coordinated species in a distorted tetrahedronal geometry.