Photoinduced Cross-Coupling of Aryl Iodides with Alkenes
作者:Yuliang Liu、Haoyu Li、Shunsuke Chiba
DOI:10.1021/acs.orglett.0c03935
日期:2021.1.15
A protocol for photoinduced cross-coupling of aryliodides having polar π-functional groups or elongated π-conjugation with alkenes has been developed. The radical cascade mechanism involving generation of aryl radicals via C–I bond homolysis of photoexcited aryliodides and their subsequent addition to alkenes is proposed. The method enables iodide-selective cross-coupling over other halogen leaving
Toward a mild dehydroformylation using base-metal catalysis
作者:Dylan J. Abrams、Julian G. West、Erik J. Sorensen
DOI:10.1039/c6sc04607j
日期:——
biosynthesis of cholesterol and related sterols under mild conditions using base-metal catalysts. In contrast, chemists have recently developed a non-oxidative dehydroformylation method; however, it requires high temperatures and a precious-metal catalyst. Careful study of both approaches has informed our efforts to design a base-metal catalyzed, mild dehydroformylation method that incorporates benefits from
and -stannane, the photosubstitution occurred at both α- and γ-positions of the allylic moiety in a constant ratio, regardless of the kinds of metals. 1,3-Dicyanobenzene (m-DCB) was less reactive to the photosubstitutionreaction. The reactivity of group 14 organometallic compounds increased in the order: Si- < Ge- < Sn-compounds. The photoreactions were sensitized by aromatic hydrocarbons such as
Direct one-pot syntheses of 4-(ω -alkenyl)-benzonitriles in high yields have been achieved via the reaction of terephthalonitriledianion with allyl or co-alkenyl bromides in liquidammonia.
Photochemical nucleophile–olefin combination, aromatic substitution (photo-NOCAS) reaction, Part 15. Investigations involving fluoride anion as the nucleophile and the effect of fluorine substitution on the relative stability of the reaction intermediates
作者:Mary S.W. Chan、Donald R. Arnold
DOI:10.1139/v97-614
日期:1997.12.1
The scope of the photochemical nucleophile–olefin combination, aromatic substitution (photo-NOCAS) reaction has been extended to include fluoride anion as the nucleophile. The 4-cyanophenyl substituted fluoroalkanes were obtained in moderate yields with 2,3-dimethyl-2-butene and 2-methyl-2-butene reacting as the olefin. The yields were lower with 2-methylpropene, and no photo-NOCAS products were detected