Comprehensive Summary A visible light photocatalytic[3+2]cycloaddition of alkynes with readily accessible organic iodides as the C3 synthon is developed herein.By merging halogen atom transfer(XAT)and hydrogen atom tr...Comprehensive Summary A visible light photocatalytic[3+2]cycloaddition of alkynes with readily accessible organic iodides as the C3 synthon is developed herein.By merging halogen atom transfer(XAT)and hydrogen atom transfer(HAT),alkyl/aryl iodides serve as a formal diradical precursor and add across C-C triple bonds to deliver a number of functionalized cyclopentanes in moderate to high yields with exceptional regio-and diastereoselectivity.A reductive radical-polar crossover mechanism,involving the cascade XAT,radical addition,1,5-HAT,polar effect-promoted 5-endo annulation,single electron transfer(SET)reduction,and protonation,may account for this unprecedented dehalogenative[3+2]cycloaddition.This work not only expands the repertoire of the traditional RATC methodology,but also provides a robust platform for the expedient assembly of cyclopentanes,a valuable structural motif in the realms of medicinal chemistry and material sciences.展开更多
A novel graft macromolecular coupling agent with well-defined structure was synthesized by atom transfer radical polymerization(ATRP). Since the silicon of graft polymers possesses a strong affinity to hydroxyl minera...A novel graft macromolecular coupling agent with well-defined structure was synthesized by atom transfer radical polymerization(ATRP). Since the silicon of graft polymers possesses a strong affinity to hydroxyl mineral, it gives fillers some new properties such as the increase of the interaction of fillers with matrix. The properties, structure of macromolecular coupling agent and its composite were studied by dynamic mechanical spectra, IR, UV, NMR, GPC and SEM.展开更多
基金supported by the Natural Science Foundation of Zhejiang Province(LZ20B020001 and LY23B020004)the Ten Thousand Talents Plan of Zhejiang Province(2020R52021)+1 种基金the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang Province(2022R01007)the National Natural Science Foundation of China(22371262,22071218,and 22203076).
文摘Comprehensive Summary A visible light photocatalytic[3+2]cycloaddition of alkynes with readily accessible organic iodides as the C3 synthon is developed herein.By merging halogen atom transfer(XAT)and hydrogen atom transfer(HAT),alkyl/aryl iodides serve as a formal diradical precursor and add across C-C triple bonds to deliver a number of functionalized cyclopentanes in moderate to high yields with exceptional regio-and diastereoselectivity.A reductive radical-polar crossover mechanism,involving the cascade XAT,radical addition,1,5-HAT,polar effect-promoted 5-endo annulation,single electron transfer(SET)reduction,and protonation,may account for this unprecedented dehalogenative[3+2]cycloaddition.This work not only expands the repertoire of the traditional RATC methodology,but also provides a robust platform for the expedient assembly of cyclopentanes,a valuable structural motif in the realms of medicinal chemistry and material sciences.
文摘A novel graft macromolecular coupling agent with well-defined structure was synthesized by atom transfer radical polymerization(ATRP). Since the silicon of graft polymers possesses a strong affinity to hydroxyl mineral, it gives fillers some new properties such as the increase of the interaction of fillers with matrix. The properties, structure of macromolecular coupling agent and its composite were studied by dynamic mechanical spectra, IR, UV, NMR, GPC and SEM.
