Cobalt-Catalyzed Allylic C(sp<sup>3</sup>)–H Carboxylation with CO<sub>2</sub>
作者:Kenichi Michigami、Tsuyoshi Mita、Yoshihiro Sato
DOI:10.1021/jacs.7b02775
日期:2017.5.3
tolerability, so that selective addition to CO2 occurred in the presence of other carbonyl groups such as amide, ester, and ketone. Since styrylacetic acidderivatives can be readily converted into optically active γ-butyrolactones through Sharpless asymmetric dihydroxylation, this allylic C(sp3)-H carboxylation showcases a facile synthesis of γ-butyrolactones from simple allylarenes via short steps.
借助 Co/Xantphos 复合物开发了末端烯烃的烯丙基 C(sp3)-H 键与 CO2 的催化羧化。广泛的烯丙基芳烃和 1,4-二烯以中等至高产率成功转化为线性苯乙烯乙酸和六-3,5-二烯酸衍生物,并具有出色的区域选择性。羧化显示出显着的官能团耐受性,因此在其他羰基(如酰胺、酯和酮)存在的情况下,会发生选择性加成到 CO2 中。由于苯乙烯乙酸衍生物可以通过 Sharpless 不对称二羟基化很容易地转化为光学活性的 γ-丁内酯,这种烯丙基 C(sp3)-H 羧化展示了从简单的烯丙基芳烃通过短步骤轻松合成 γ-丁内酯。
Retardation of the putrefaction of hides and skins
申请人:——
公开号:US04224028A1
公开(公告)日:1980-09-23
Process for the prevention and/or retardation of the putrefaction of skins, hides, or pelts of freshly slaughtered animals. The skins, hides or pelts, which have not yet been tanned, tawed or otherwise similarly treated, are treated with an effective amount of a solution. The solution contains an effective amount of a non-necrotic sclerosing fatty acid salt, an effective amount of ethanol, a buffering agent and a water carrier. The fatty acid salt is one prepared from an unsaturated fatty acid having one double bond and from an alkali metal, alkaline earth metal, alkali metal compound or alkaline earth metal compound. The pH of the solution is between 9 and 11.
An Unusual Iron-Dependent Oxidative Deformylation Reaction Providing Insight into Hydrocarbon Biosynthesis in Nature
作者:Benjamin R. Ellington、Bishwajit Paul、Debasis Das、Andrew K. Vitek、Paul M. Zimmerman、E. Neil G. Marsh
DOI:10.1021/acscatal.6b00592
日期:2016.5.6
enzymes, aldehyde decarbonylases, catalyze unusual deformylation reactions in which long-chain fatty aldehydes are converted to alkanes. These enzymes are all iron-dependent and in insects are represented by a cytochrome P450 enzyme that releases the aldehyde carbon as CO2. Here we describe a novel nonenzymatic reaction of an α-cyclopropyl-substituted aldehyde that mimics the enzyme reaction. This aldehyde