Total syntheses of all tri-oxygenated 16-phytoprostane classes <i>via</i> a common precursor constructed by oxidative cyclization and alkyl–alkyl coupling reactions as the key steps
作者:Jakub Smrček、Radek Pohl、Ullrich Jahn
DOI:10.1039/c7ob02505j
日期:——
A unified strategy for the total synthesis of the methyl esters of all phytoprostane (PhytoP) classes bearing two ring-oxygen atoms based on an orthogonally protected common precursor is described. Racemic 16-F1t-, 16-E1-PhytoP and their C-16 epimers, which also occur as racemates in Nature, were successfully obtained. The first total synthesis of very sensitive 16D1tPhytoP succeeded, however, it
Precise Isomerization Polymerization of Alkenylcyclohexanes: Stereoregular Polymers Containing Six-Membered Rings along the Polymer Chain
作者:Daisuke Takeuchi
DOI:10.1021/ja2043968
日期:2011.7.27
Pd and Ni diimine complexes catalyze the isomerization polymerization of alkenylcyclohexanes to afford polymers composed of alternating trans-cyclohexane-1,4-diyl rings and oligomethylene spacers with high selectivity. The melting points of the polymers vary from 130 to 226 °C depending on length of the oligomethylene spacer.
Pd 和 Ni 二亚胺配合物催化烯基环己烷的异构化聚合,以高选择性提供由交替的反式环己烷-1,4-二基环和低聚亚甲基间隔基组成的聚合物。聚合物的熔点从 130 到 226 °C 不等,这取决于低聚亚甲基间隔物的长度。
Bourguel, Bulletin de la Societe Chimique de France, 1927, vol. <4> 41, p. 1476