Regio- and Stereoselective Synthesis of 1,2-Dihaloalkenes Using In-Situ-Generated ICl, IBr, BrCl, I2, and Br2
作者:Xiaojun Zeng、Shiwen Liu、Yuhao Yang、Yi Yang、Gerald B. Hammond、Bo Xu
DOI:10.1016/j.chempr.2020.03.011
日期:2020.4
2-trans-dihalogenation of alkynes with an unprecedented substrate scope and exclusive regio- and stereoselectivity. This versatile dihalogenation system—a combination of NX1S electrophile and alkali metal halide (MX2) in acetic acid—is applicable for diverse categories of alkynes (electron-rich or poor alkynes, internal and terminalalkynes, or heteroatoms such as O-, N-, S-substituted alkynes). The hydrogen
我们描述了炔烃的无催化剂的1,2-反式二卤代反应,具有空前的底物范围和排他性和立体选择性。这种多功能的二卤化系统-NX 1 S亲电试剂和乙酸中的碱金属卤化物(MX 2)的组合-适用于各种类型的炔烃(富电子或弱炔烃,内部和末端炔烃,或杂原子,例如O- ,N-,S-取代的炔烃)。氢键供体溶剂乙酸对于就地生成X 1 X 2亲电试剂(包括ICl,IBr,BrCl,I 2和Br 2)是必不可少的。
Role of the polymer backbone on the reactivity of polymer-supported (dichloroiodo)benzene
作者:Boris Šket、Marko Zupan、Pavle Zupet
DOI:10.1016/s0040-4020(01)91811-3
日期:1984.1
chlorine addition with polyaryliododichloride to cis or trans-1-phenylpropene is very similar to that observed in the reaction with Cl2 under ionic conditions, and its reactivity differs markedly from (dichloroiodo)benzene, which reacts via radical intermediates. Similar studies with 1-phenylalkynes and norbornene are described.
Stereochemistry of chlorination and chloroiodination of alkylphenylacetylenes by CuCl2
作者:Sakae Uemura、Akira Onoe、Masaya Okano
DOI:10.1039/c39750000925
日期:——
Reaction of alkylphenylacetylenes, PhCCR (R = H or alkyl)(1), with CuCl2–LiCl or CuCl2–I2 in acetonitrile gives the corresponding dihalogenoalkenes in good yields; E-addition is favoured except in the chlorination of (1, R = But) where Z-addition predominates.
Energy barrier for 1,2-chlorine migration in α-methyl-α-chlorobenzyl(chloro)carbene
作者:Michael T. H. Liu、Shawn K. Murray、Jianhuan Zhu
DOI:10.1039/c39900001650
日期:——
An activation energy of 3.4 kcal mol–1(1 cal = 4.184 J) was obtained for the 1,2-chlorinemigration in α-methyl-α-chlorobenzyl(chloro)carbene.
在α-甲基-α-氯苄基(氯)卡宾中进行1,2-氯的迁移时,活化能为3.4 kcal mol –1(1 cal = 4.184 J)。
Method for producing vicinal dihalogenated products and uses thereof, and process for preparing epoxides using the same
申请人:CETUS CORPORATION
公开号:EP0082006A2
公开(公告)日:1983-06-22
A method for the manufacture of vicinal dihalogenated products from alkenes and alkynes by enzymatic reaction. The respective alkene oraikyne is reacted with a halogenating enzyme, an oxidizing agent and a halide ion source. The inventional- so provides a process for preparing epoxides using such products and includes various uses of the aforesaid products.