Synthesis, Molecular Structure, and Spectroscopical Properties of Alkenylphosphonic Derivatives. 1. Vinyl-, Propenyl-, (Bromoalkenyl)-, and (Cyanoalkenyl)phosphonic Compounds
摘要:
Several vinyl-, propenyl-, (bromoalkenyl)-, and (cyanoalkenyl)phosphonate derivatives have been synthesized. The (2-cyanovinyl)phosphonates have been obtained with an important improvement in the yield (40% versus 6%). The separation of the E and Z isomers of the cyano derivatives and their hydrolysis to the corresponding phosphonic acids have been studied. The bromination and dehydrobromination of some alkenylphosphonic derivatives have also been studied. Spectroscopical studies from UV, IR, Raman, and H-1, C-13, and P-31 NMR have been performed in most of these derivatives. The C=C/P-O pi conjugation exists but it is weak in all these compounds. Dipole moments and C=C/P=O conformational populations have been calculated theoretically by ab initio methods. The effect of the solvent polarity on the conformational population has been observed by IR spectroscopy disclosing two C=C/P=O conformers. Experimental and theoretical results have been compared, a high level of agreement has been found.
Use of indium hydride (Cl2InH) for chemoselective reduction of the carboncarbon double bond in conjugated alkenes
作者:Brindaban C. Ranu、Sampak Samanta
DOI:10.1016/s0040-4039(02)01668-4
日期:2002.10
Indium hydride (Cl2InH) generated in situ from a combination of a catalytic amount of indium(III) chloride and sodium borohydride selectively reduces the carboncarbondoublebond in conjugatedalkenes such as α,α-dicyano olefins, α,β-unsaturated nitriles, cyano esters, cyanophosphonate, diesters and ketones.
Synthesis of Substituted 2-Alkoxycarbonyl or 2-Cyano-1,3-butadienes
作者:Yu-Xiu Liu、Cheng-Fu Xu、Ru-Zhen Cao、Lun-Zu Liu
DOI:10.1081/scc-120024875
日期:2003.10
A series of 2-butoxycarbonyl-1,4-diaryl-1,3-butadienes and 2-cyano-1,4-diaryl-1,3-butadienes are synthesized by one pot reaction of 2-butoxycarbonyl or 2-cyanoethenylphosphonate with aromatic aldehyde and tributylphosphine.
Synthesis, Molecular Structure, and Spectroscopical Properties of Alkenylphosphonic Derivatives. 1. Vinyl-, Propenyl-, (Bromoalkenyl)-, and (Cyanoalkenyl)phosphonic Compounds
作者:C. I. Sainz-Diaz、E. Galvez-Ruano、A. Hernandez-Laguna、J. Bellanato
DOI:10.1021/jo00106a017
日期:1995.1
Several vinyl-, propenyl-, (bromoalkenyl)-, and (cyanoalkenyl)phosphonate derivatives have been synthesized. The (2-cyanovinyl)phosphonates have been obtained with an important improvement in the yield (40% versus 6%). The separation of the E and Z isomers of the cyano derivatives and their hydrolysis to the corresponding phosphonic acids have been studied. The bromination and dehydrobromination of some alkenylphosphonic derivatives have also been studied. Spectroscopical studies from UV, IR, Raman, and H-1, C-13, and P-31 NMR have been performed in most of these derivatives. The C=C/P-O pi conjugation exists but it is weak in all these compounds. Dipole moments and C=C/P=O conformational populations have been calculated theoretically by ab initio methods. The effect of the solvent polarity on the conformational population has been observed by IR spectroscopy disclosing two C=C/P=O conformers. Experimental and theoretical results have been compared, a high level of agreement has been found.
Reduction of activated conjugated alkenes by the InCl3–NaBH4 reagent system
作者:Brindaban C Ranu、Sampak Samanta
DOI:10.1016/j.tet.2003.08.022
日期:2003.9
catalytic amount of indium (III) chloride and sodium borohydride in acetonitrile reduces selectively the carbon–carbon double bonds in conjugated alkenes such as α,α-dicyano olefins, α,β-unsaturated nitriles, cyanoesters, cyanophosphonate and dicarboxylic esters. However, reduction of chalcones is little different. They are reduced to a mixture of saturated ketones and alcohols if the reaction mixture is quenched