Crystal structure and coordination chemistry of (2-carbomethoxyethyl)iododiphenylstannane, Iph 2SnCh 2Ch 2CO 2Me

Abstract

The crystal structure of IPh 2SnCH 2CH 2Co 2Me: C 16H 17IO 2Sn ( 10; X = I) has been determined; the tin atom adopts a distorted trigonal bipyramidal geometry, with iodine and the internal carbonyl oxygen in axial sites. The chelated structure of 10 (X = I) [ v(CO) 1684 cm −1] persists in such solvents as dichloromethane, chloroform, tetrahydrofuran and acetonitrile. Pyridine is able to compete with the intramolecular ester coordination in CH 2Cl 2 solution with the formation of unchelated IPh 2Sn(py)CH 2CH 2CO 2Me ( 11) [ v(CO) 1734 cm −1]; the formation constant of 11 is 0.07 ± 0.01 1 mol −1 at 25°C.