Synthesis,Crystal Structure and Biological Activities of Novel Di-n-butyl Tin Di-carboxylate

A novel macrocyclic complex 2{[（n-Bu2Sn）4O2-L2]2DMF} was synthesized by the reaction of 4-（1,2- dithioethylene）methylene-3,5-disoxo-1,6-heptadiene-1,7-dis-（o-formy~）-dis-p-phenoxyacetic acid（LH2, compound 1） with di-n-butyltin oxide. Compound 1 and complex 2 were characterized by elemental analysis, FTIR spectroscopy, and ~H NMR spectroscopy. The crystal structure of complex 2 was determined by single crystal X-ray diffraction analysis. There are two crystallographic independent molecules in complex 2, and each molecule structure is centro-symmetric and features a central rhombus cyclic Bu4Sn2O2 unit with two exocyclic Sn atoms linked at the O atoms of the four-membered ring. In molecule A, the four Sn atoms are five-coordinated. However, in molecule B, the four Sn atoms have two different coordination geometries, the endocyclic Sn atoms are five-coordinated and the exocyclic Sn atoms are four-coordinated. The dicarboxylate ligands in molecules A and B bridge exocylic or endocyclic tin atoms, forming two macroheterocycles with 26 atoms. Pilot studies have indicated that complex 2 has good anti- bacterial and antitumour activities.

无毒增塑剂柠檬酸三丁酯的绿色催化合成

以锡粉和碘代正丁烷为原料合成了氧化二正丁基锡,研究了以氧化二正丁基锡为催化剂合成无毒增塑剂柠檬酸三丁酯（TBC）,考察了催化剂用量、醇酸物质的量比、反应温度等因素对反应结果的影响,对产品进行了表征。实验结果表明,氧化二正丁基锡催化合成柠檬酸三丁酯的最佳条件为：n（正丁醇）∶n（柠檬酸）=4.5∶1,催化剂用量为柠檬酸质量的0.5%,反应温度120~130℃,在最佳反应条件下,柠檬酸三丁酯收率可达98%以上。