Novel ruthenium-catalyzed vinylic substitution reactions of vinylic trifluoromethanesulfonates with nucleophiles such as cyclic 1,3-diketones and alcohols have been found to give the corresponding vinylic-substituted products in good to high yields. This catalytic reaction is considered to be a new type of vinylic substitution reaction. Reactions of α-ketoacetylenes with alcohols have also been found
σ-Cumulenic transition metal compounds. Remarkably stable cobaloxime complexes; (R)2CCCHCo(dmg)2py
作者:Peter J. Stang、Lars G. Wistrand
DOI:10.1016/s0022-328x(00)80509-4
日期:1981.1
Interaction of NaCo(dmg)2py with (R)2CC(OSO2CF3)CCH in methanol provides a simple route to novel, stable cumulenyl complexes (R)2CCCCHCo(dmg)2py, where R = CH3 or C6H5. In the case of R = H the stable ene-yne complex H2CC(CCH)Co(dmg)2py was isolated. The formation and properties of these complexes are discussed.
Reaction of nucleophiles with enyne triflates R1R2CC(OTf)CCR31, via an SN-2′ process, results in functionalized enynes by way a 1,3-hydride shift from the initially formed butatrienes.
Extended unsaturated carbenes. Novel silicon, germanium, and tin-functionalized cumulenes, R2C:C:C:CHMR'3 via insertion of alkadienylidenecarbenes into Group (IV) hydrides
作者:Peter J. Stang、Mitchell R. White
DOI:10.1021/ja00408a025
日期:1981.9
Extended unsaturated carbenes. Generation and nature of alkadienylidenecarbenes