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
Water accelerated reduction system: Pinacolic coupling of aromatic carbonyl compounds and reductive dimerization cyclization of 1,1-dicyanoalkenes
作者:Lei Wang、Yongmin Zhang
DOI:10.1016/s0040-4020(98)00666-8
日期:1998.9
By action of in THF at room temperature, aromatic carbonylcompounds produce the corresponding 1,2-diols via reductive coupling reaction and 1,1-dicyanoalkenes produce the functionalized cyclopentenes through reductive dimerization followed by intramolecular cyclization in one-pot. The former gives approximately equal amounts of (dl)- and (meso)-1,2-diols and the later gives the major trans-form products
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.