聚乳酸(PLA)是一种完全可生物降解和可回收的塑料,由生物衍生的单体制成:它是一种循环经济型塑料。它的性质取决于其立体化学,等规聚乳酸显示出优异的热机械性能。在这里,描述了一种通过利用轮烷构象动力学来控制战术性的新手段。动态的非手性[2]轮烷可以显示出较高的等选择性(P i = 0.8,298 K),而无需任何手性添加剂,并且可以通过链端控制机制进行链合。有机催化的动态立体选择性可能适用于其他小分子和聚合催化剂。
Nickel-Catalyzed Reductive Cross-Coupling of Oxalates Derived from α-Hydroxy Carbonyls with Vinyl Bromides
作者:Fan Wu、Cheng Ye、Weiqi Tong
DOI:10.1055/s-0040-1719881
日期:2022.5
A nickel-catalyzed cross-electrophile coupling is disclosed in which a range of vinyl bromides were utilized as electrophiles with oxalates derived from α-hydroxy carbonyls as precursors to carbonyl radical coupling partners. This method is compatible with a broad range of functional groups, providing a complementary solution for the construction of β,γ-unsaturated carbonyl compounds.