Heteroleptic tin (II) dialkoxides stabilized by intramolecular coordination Sn(OCH 2CH 2NMe 2)(OR) (R = Me, Et, iPr, tBu, Ph). Synthesis, structure and catalytic activity in polyurethane synthesis

Abstract

A straightforward method of synthesis of heteroleptic tin (II) alkoxides stabilized by one intramolecular coordination bond was developed. Addition of one equivalent of dimethylamino ethanol to diamide Sn(N(SiMe 3) 2) 2 ( 5) yields alkoxy-amido derivative Sn(OCH 2CH 2NMe 2)(N(SiMe 3) 2) ( 2). Further addition of alcohol leads to corresponding heteroleptic dialkoxides Sn(OCH 2CH 2NMe 2)(OR) (R = Me ( 6), Et ( 7), i Pr ( 8), t Bu ( 9), Ph ( 10)). Catalytic activity of tin (II) compounds in polyurethane formation was tested.