Steric effects on the formation of isolable products in the reactions of dibutyltin oxides with carboxylic acids
作者:V.B. Mokal、V.K. Jain
DOI:10.1016/0022-328x(92)83381-q
日期:1992.12
(CH3)2CH (iPr) and (CH3)3C (tBu)] in 1:1 and 1:2 stoichiometry were investigated. The products formed in these reactions were characterized by elemental analyses, IR and NMR (1H, 13C and 119Sn) data. Reactions in 1:2 stoichiometry afforded dibutyltin dicarboxylates which have six-coordinate tin atom. Steric effects of the butyl group and the R group of the carboxylate ligand play an important role in
氧化二丁基锡,x Bu 2 SnO [ x = n(正态),i(异),s(仲)和t(叔)]与羧酸[RCOOH; řCH 3,(Me)时,CH 3 CH 2(ET),(CH 3)2 CH(我PR)和(CH 3)3 C(吨丁基)]在1:1和1:2的化学计量进行了研究。在这些反应中形成的产物通过元素分析,IR和NMR(1 H,13 C和119Sn)数据。以1:2化学计量比的反应得到具有六配位锡原子的二羧酸二丁基锡。丁基和羧酸酯配体的R基团的立体效应在1:1反应中起重要作用。与n Bu 2 SnO形成二羧基四有机锡氧烷类,而[ t Bu 2 Sn(μ-OH)(OOCR)] 2羟基配合物是唯一与t Bu 2 SnO形成的产物。所有这些配合物的立体化学都基于NMR数据进行了讨论。