Synthesis of Unsymmetrical 1,4-Dicarbonyl Compounds by Photocatalytic Oxidative Radical Additions
作者:Ya Dong、Ruining Li、Junliang Zhou、Zhankui Sun
DOI:10.1021/acs.orglett.1c02208
日期:2021.8.20
Herein we report a photocatalytic oxidative radical addition reaction for the synthesis of unsymmetrical 1,4-dicarbonyl compounds. This reaction utilizes a desulfurization process to generate electrophilic radicals, which add to α-halogenated alkenes and undergo further oxidation to deliver 1,4-dicarbonyl compounds. This mild and highly efficient method provides a valuable alternative to known strategies
Catalyst-free hydrochlorination protocol for terminal arylalkynes with hydrogen chloride
作者:Cai-Xia Xu、Cun-Hua Ma、Fu-Rong Xiao、Hong-Wei Chen、Bin Dai
DOI:10.1016/j.cclet.2016.04.019
日期:2016.11
present a simple and straightforward protocol for hydrochlorination of terminal arylalkynes to vinyl chlorides using hydrogenchloride under mild reaction conditions. This protocol does not involve any metal catalysts or additives. It is simple, inexpensive, and easy to prepare, and exhibits good reaction activity. The hydrochlorination proceeds smoothly to yield unique regioselective products via the
HCl in solution accepts electron density from Au NPs and partially reduces at room temperature, as occurs with other simple diatomic molecules, such as O2 and H2. The activation can be run catalytically in the presence of alkynes to give exclusively E-vinyl chlorides, after the regio- and stereoselective transfer of HCl. Based also on this method, vinyl chloride monomer (VCM) can be produced in a milder
POLYISOCYANATE COMPOSITION AND ISOCYANATE POLYMER COMPOSITION
申请人:Asahi Kasei Chemicals Corporation
公开号:EP2915803A1
公开(公告)日:2015-09-09
The present invention relates to a polyisocyanate composition comprising, on the basis of the total mass of the polyisocyanate composition, 97 weight % or more of a polyisocyanate, and 2.0 mass ppm or more and 1.0×104 mass ppm or less of a compound having at least one unsaturated bond in which the compound is a different compound from the polyisocyanate, or 5.0 mass ppm or more and 2.0×104 mass ppm or less of at least one inactive compound selected from the group consisting of a hydrocarbon compound, an ether compound, a sulfide compound, a halogenated hydrocarbon compound, a Si-containing hydrocarbon compound, a Si-containing ether compound, and a Si-containing sulfide compound.
ISOCYANATE COMPOSITION, PRODUCTION METHOD FOR ISOCYANATE COMPOSITION, AND PRODUCTION METHOD FOR ISOCYANATE POLYMER
申请人:ASAHI KASEI KABUSHIKI KAISHA
公开号:EP3527593A1
公开(公告)日:2019-08-21
An isocyanate composition according to the present invention contains an isocyanate compound of formula (1) and/or (2) (wherein R1 represents a hydrogen or a monovalent organic group, and R2 represents a monovalent organic group), and, relative to the total mass of the isocyanate compound in the composition, 1.0 ppm by mass to 10% by mass of a compound of formula (3): R13-(COO-R14)a (wherein R13 represents an organic group with a valence of a, R14 represents a monovalent organic group, and a represents an integer of 1 or 2), which is different from the isocyanate compound, and/or, 1.0 ppm by mass to 10% by mass of a compound having an UV absorption in an area of decamer or higher isocyanates in a measurement spectrum of gel permeation chromatography.