Metallic samarium promoted reductive dimerization cyclization of gem-diactivated alkenes, reductive debromination of vic-dibromides, and reduction of sodium alkyl thiosulfates in aqueous media
作者:Lei Wang、Yongmin Zhang
DOI:10.1016/s0040-4020(99)00602-x
日期:1999.8
solution at room temperature, metallic samarium promoted reductive dimerization cyclization of gem-diactivated alkenes, reductive debromination of vic-dibromides, and reduction of sodium alkyl thiosulfates occur to afford corresponding functionalized cyclopentenes, (E)-alkenes, and disulfides, respectively in good yield. Only sub-stoichiometric quantities of samarium are employed in the former reactions
The reaction of substituted dicyanoalkenes with aqueous titanium(III) chloride was examined. The dicyanoalkenes, which showed irreversible reduction characteristics on cyclic voltammograms, (typically, 2-cyano-3-phenylpropenenitrile), afforded cyclized and/or uncyclized hydrodimers, while those characterized by reversible reduction behavior, (typically, 2-cyano-3,3-diphenylpropenenitrile), yielded
Clarke, Norman C.; Runciman, Peter J. I.; Utley, James H. P., Journal of the Chemical Society. Perkin transactions II, 1987, p. 435 - 440
作者:Clarke, Norman C.、Runciman, Peter J. I.、Utley, James H. P.、Landquist, Justus K.
DOI:——
日期:——
Novel reductive coupling cyclization of 1,1-dicyanoalkenes promoted by metallic samarium in aqueous media
作者:Lei Wang、Yongmin Zhang
DOI:10.1016/s0040-4039(98)00947-2
日期:1998.7
The reductive coupling cyclization of 1,1-dicyanoalkenes was performed with metallic samarium in saturated aqueous NH4Cl-THF solution at room temperature. Sub-stoichiometric quantities of samarium could be employed and trans-isomer was the major product. (C) 1998 Elsevier Science Ltd. All rights reserved.
Novel Reductive Dimerization Cyclization of 1,1-Dicyanoalkenes Mediated by Zinc in Aqueous Media
作者:Lei Wang、Yongmin Zhang
DOI:10.1080/00397919808004432
日期:1998.9
Zinc-mediated reductive dimerization cyclization of 1,1-dicyanoalkenes 1 occurs to give functionalized cyclopentenes 2(cis) and 3(trans) in good yields under saturated aqueous NH4Cl-THF solution at room temperature. 3 is major product.