Ring-Opening Polymerization and Copolymerization of Propylene Oxide Catalyzed by N-Heterocyclic Carbenes
作者:Ronald Lindner、Michael L. Lejkowski、Séverine Lavy、Peter Deglmann、Kerstin T. Wiss、Sirus Zarbakhsh、Lars Meyer、Michael Limbach
DOI:10.1002/cctc.201300802
日期:2014.2
Herein, we demonstrate the application of adducts of various N‐heterocycliccarbenes (NHCs) with CO2 (i.e., NHC–CO2) as precatalysts in the ring‐opening homopolymerization of propylene oxide (PO) onto diethylene glycol as a chain starter to give well‐defined polyether diols. The influence of various NHCs on the structure of the polymers and the mechanism of this reaction were investigated both experimentally
CATALYST FOR DISSOCIATION OF BLOCKING AGENT FOR BLOCKED ISOCYANATES, AND THERMOSETTING COMPOSITION CONTAINING SAID CATALYST FOR DISSOCIATION OF BLOCKING AGENT
申请人:Koei Chemical Company, Limited
公开号:EP3689931A1
公开(公告)日:2020-08-05
A blocking agent dissociation catalyst for blocked isocyanates comprising a nitrogen-containing compound represented by Formula (1a):
wherein D is represented by Formula (2):
wherein R1, R2, R3, R4, and a are as described in the specification.
一种用于封端异氰酸酯的封端剂解离催化剂,由式(1a)代表的含氮化合物组成:
其中 D 由式(2)表示:
其中 R1、R2、R3、R4 和 a 如说明书所述。
Synthesis of rhodium N-heterocyclic carbene complexes and their catalytic activity in the hydrosilylation of alkenes in ionic liquid medium
作者:Jiayun Li、Jiajian Peng、Ying Bai、Guoqiao Lai、Xiaonian Li
DOI:10.1016/j.jorganchem.2010.11.017
日期:2011.5
Rhodiumcomplexes bearing N-heterocyclic carbene (NHC) ligands were prepared from bis(η4-1,5-cyclooctadiene) dichlorodirhodium and 1-alkyl-3-methylimidazolium-2-carboxylate, and the catalytic properties of rhodiumcomplexes prepared in the hydrosilylation of alkenes in ionic liquid media were investigated. It was found that both the catalytic activity and selectivity of the rhodiumcomplexes bearing