Facile synthesis of multisubstituted buta-1,3-dienes via Suzuki–Miyaura and Kumada cross-coupling strategy of 2,4-diiodo-buta-1-enes with arylboronic acids and Grignard reagents
Facile Synthesis of Cross-Conjugatedgem-Disubstituted Trienes via Palladium-Catalyzed Cross-Coupling Protocol of 1,1-Disubstituted 2,4-Diiodo-But-1-ene With Alkenes
Facile Synthesis of 2-Alkynyl Buta-1,3-dienes via Sonogashira Cross-Coupling Methodology
作者:Li-Xiong Shao、Min Shi
DOI:10.1021/jo051434l
日期:2005.10.1
[GRAPHIC]2-Alkynyl buta-1,3-dienes 4 can be synthesized in moderate to high yields by the reactions of the corresponding diiodides 1 derived from methylenecyclopropanes with substituted alkynes 2 via Sonogashira cross-coupling in the catalysis of Pd(PPh3)(4)/CuI.
[EN] CATALYST SYSTEM FOR MULTI-BLOCK COPOLYMER FORMATION<br/>[FR] SYSTÈME CATALYTIQUE POUR LA FORMATION D'UN COPOLYMÈRE MULTI-SÉQUENCÉ
申请人:DOW GLOBAL TECHNOLOGIES LLC
公开号:WO2018170227A1
公开(公告)日:2018-09-20
The present disclosure relates to an olefin polymerization catalyst system for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first olefin polymerization procatalyst, (B) a second olefin polymerization procatalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by procatalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.