Reactions of 3-alkyl- and 3,3-dialkyl-1-bromoallenes with organocuprates: Effects of the nature of the cuprate reagent on the regio- and stereoselectivity
作者:Anna Maria Caporusso、Carmela Polizzi、Luciano Lardicci
DOI:10.1016/s0040-4039(00)96867-9
日期:1987.1
Organocuprates induce 1,3- and direct substitution in 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes leading respectively to either terminal acetylenes or allenic hydrocarbons. The nature of the cuprate exerts a prominent role in determining both the regio- and the stereochemistry of these reactions.
Reaction of 1-bromo-1,2-dienes with alkylcuprates as a regio- and stereo-selective route to acetylenic or allenic compounds
作者:Carmela Polizzi、Carla Consoloni、Luciano Lardicci、Anna Maria Caporusso
DOI:10.1016/0022-328x(91)80179-n
日期:1991.10
Alkylcuprates react with 1-bromo-1,2-dienes to give allenic and/or acetylenic products. The selectivity of the crosscoupling is markedly dependent on the nature of the copper reagent, which plays a prominent role in determining both the regio- and the stereo-chemistry. The preparative aspects of these copper-induced reactions are discussed and their possible mechanism discussed.
作者:Dennis G. Garratt、Pierre L. Beaulieu、M.Dominic Ryan
DOI:10.1016/s0040-4020(01)83115-x
日期:1980.1
Benzeneselenenyl chloride reacts with 1,3-dialkyl-substituted allenes in methylene chloride solution to give 1:1-adducts. Attack by selenium is found to occur exclusively at the central allenic carbon. In contrast to the analogous reaction of arenesulphenyl chlorides, the preferential formation of the Z-alkene is observed. A mechanism involving the preequilibrium formation of alkylideneseleniranium
Dinuclear Zinc Hydride Supported by an Anionic Bis(N-Heterocyclic Carbene) Ligand
作者:Arnab Rit、Thomas P. Spaniol、Jun Okuda
DOI:10.1002/asia.201301268
日期:2014.2
Methylene‐linked bis(N,N′‐di‐tert‐butylimidazol‐2‐ylidene) 1 reacted with diethylzinc to give dinuclearzinc ethyl compound 2, which contains a formally anionicbis(carbene) ligand as a result of deprotonation of the methylene bridge. The reaction of 2 with PhSiH3 gave the phenylsilyl compound 3. The zinchydride 4 was obtained by the reaction of 2 with LiAlH4 or Ph3SiOH followed by treatment with
A Ni(cod)2–aminophosphine complex catalyzed the addition of aryl- and alkenylboronates to 1,2-dienes to give the hydroarylation and hydroalkenylation products of the 1,2-dienes, whereas the hydroarylation products of a 1,2-diene and an alkyne were obtained with a Ni(cod)2–PPh3 catalyst.