Topic
Bicyclic molecule
About: Bicyclic molecule is a research topic. Over the lifetime, 29587 publications have been published within this topic receiving 451252 citations. The topic is also known as: bicyclic molecule.
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157 citations
TL;DR: In this paper, the ready synthesis of differently substituted 2H-imidazo[1,5-a]pyridin-4-ium bromides is reported, which are precursors for a new class of N-heterocyclic carbene ligands.
157 citations
TL;DR: This reaction represents one of the first examples of the addition of an organopalladium moiety to the carbon-nitrogen triple bond of a nitrile and is compatible with a number of functional groups.
Abstract: 2-Iodobenzonitrile, its derivatives, and various heterocyclic analogues undergo palladium(0)-catalyzed annulation onto diarylacetylenes or bicyclic alkenes to afford 2,3-diarylindenones and polycyclic aromatic ketones in very good to excellent yields. This reaction represents one of the first examples of the addition of an organopalladium moiety to the carbon−nitrogen triple bond of a nitrile. The reaction is compatible with a number of functional groups. A reaction mechanism, as well as a model accounting for the electronic effects of substituents on the aromatic ring of the nitrile, is proposed.
155 citations
155 citations
TL;DR: An MALDI-TOF mass spectrum of the obtainedCopolymer showed that the copolymerization was initiated by the insertion of CO(2) into Zn-alkoxide to give [(S)-diphenyl(pyrroridin-2-ly)methoxy]-[O)O-(1,2-cyclohexylene)-O](n)-H (copolymer I), including chiral ligand 1a as an initiating group.
Abstract: Dimeric zinc complex 2a [ = Et2Zn2(1a)2] has been synthesized by the reaction of Et2Zn and (S)-diphenyl(pyrrolidin-2-yl)methanol (1a-H). X-ray crystallography revealed that the alkoxide ligand replaced one of the two ethyl groups of Et2Zn and formed a five-membered chelate ring through a ZnN dative bond. Two zinc centers were bridged by oxygen atoms to form a Zn2O2 four-membered ring with a syn relationship between the two ethyl groups on the zinc centers. Dimeric zinc complex 2a was an active catalyst for asymmetric alternating copolymerization of cyclohexene oxide and CO2. An MALDI-TOF mass spectrum of the obtained copolymer showed that the copolymerization was initiated by the insertion of CO2 into Znalkoxide to give [(S)-diphenyl(pyrroridin-2-ly)methoxy][C(O)O(1,2-cyclohexylene)O]nH (copolymer I), including chiral ligand 1a as an initiating group. Complex 3a-OEt ( = EtZn(1a)2ZnOEt), in which an ethoxy group replaced one of the two ethyl groups in 2a, also polymerized cyclohexene oxide and CO2 with hig...
155 citations