Mechanism‐Guided Design of Chain‐Growth Click Polymerization Based on a Thiol‐Michael Reaction
摘要:
AbstractThe development of chain‐growth click polymerization is challenging yet desirable in modern polymer chemistry. In this work, we reported a novel chain‐growth click polymerization based on the thiol‐Michael reaction. This polymerization could be performed efficiently under ambient conditions and spatiotemporally regulated by ultraviolet light, allowing the synthesis of sulfur‐containing polymers in excellent yields and high molecular weights. Density functional theory calculations indicated that the thiolate addition to the Michael acceptor is the rate‐determining step, and introducing the phenyl group could facilitate the chain‐growth process. This polymerization is a new type of chain‐growth click polymerization, which will provide a unique approach to creating functional polymers.
Mechanism‐Guided Design of Chain‐Growth Click Polymerization Based on a Thiol‐Michael Reaction
摘要:
AbstractThe development of chain‐growth click polymerization is challenging yet desirable in modern polymer chemistry. In this work, we reported a novel chain‐growth click polymerization based on the thiol‐Michael reaction. This polymerization could be performed efficiently under ambient conditions and spatiotemporally regulated by ultraviolet light, allowing the synthesis of sulfur‐containing polymers in excellent yields and high molecular weights. Density functional theory calculations indicated that the thiolate addition to the Michael acceptor is the rate‐determining step, and introducing the phenyl group could facilitate the chain‐growth process. This polymerization is a new type of chain‐growth click polymerization, which will provide a unique approach to creating functional polymers.
Regioselective synthesis of poly-substituted thiophenes from Baylis–Hillman adducts
作者:Hyun Seung Lee、Se Hee Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2009.09.012
日期:2009.11
The reaction of Baylis–Hillman acetates and ethyl mercaptoacetate in the presence of DBU in DMF produced 2,3,4-trisubstituted tetrahydrothiophenes at room temperature as a diastereomeric mixture via the sequential SN2′ and Michael addition. Aromatization of tetrahydrothiophenes by DDQ oxidation produced 2,3,4-trisubstituted thiophenes in good yields.
在DBU中,在DBU中,Baylis–Hillman乙酸盐和巯基乙酸乙酯的反应通过连续的S N 2'和Michael加成反应,在室温下生成2,3,4-三取代的四氢噻吩,为非对映异构体混合物。通过DDQ氧化对四氢噻吩进行芳香化处理,可得到高产率的2,3,4-三取代噻吩。