An efficient Co-catalyzed 1,4-addition reaction of alkyl/aryl triflates and tosylates with activated alkenes is described. In this reaction, air-stable cobalt(II) complex, mild reducing agent Zn and simple proton source (H2O) are used. A radical mechanism for the addition of alkyl tosylates to activated alkenes is likely involved.
(PhMe2Si−Bpin), a large panel of electron-withdrawing alkenes was successfully converted into the hydrosilylated product in good to excellent yields. This direct electrochemical hydrosilylation does not require exogenous oxidants and catalysts. Preliminary mechanistic study supported the involvement of a silyl radical, which reacted on the alkene.
Conjugate addition is among the most important synthetic protocols for constructing carbon skeletons and is widely used to synthesize natural products and drugs. However, asymmetric catalysis studies have mainly focused on constructing stereogenic centers arising from conjugate alkenes. Here, we report the first photoinduced cobalt-catalyzed dynamic kinetic reductive conjugate addition reaction that
METHOD FOR PRODUCING FIBER-REINFORCED RESIN COMPOSITE MATERIAL
申请人:NICCA CHEMICAL CO., LTD.
公开号:US20170058087A1
公开(公告)日:2017-03-02
A method for producing a fiber-reinforced resin composite material includes a step of curing a composition for producing a fiber-reinforced resin composite material, which includes a reinforcing fiber material and a resin composition including a radical reactive resin having at least one polymerizable unsaturated double bond, by irradiating the composition with ionizing radiation.
Cobalt-catalyzed dimerization of alkenes
作者:Chun-Chih Wang、Pao-Shun Lin、Chien-Hong Cheng
DOI:10.1016/j.tetlet.2004.04.085
日期:2004.8
PPh3 and zinc metal conjugated alkenes (CH2CHCOOR, CH2CHCN, CH2CHSO2Ph and CH2CHCONEt2) undergo reductive tail-to-tail dimerization to yield the corresponding saturated linear products. Under similar reaction conditions, vinylarenes (ArCHCH2) give stereoselective head-to-tail dimerization products, trans-1,3-diarylbut-1-ene, in good to excellent yields.