The reaction of ozonides from mono-substituted alkenes with stabilized phosphorus ylides
作者:Yung-Son Hon、Ling Lu、Shyh-Yuan Li
DOI:10.1039/c39900001627
日期:——
Ozonides derived frommono-substitutedalkenes react with methyl (triphenylphosphoranylidene)acetate or (triphenylphosphoranylidene)acetophenone to form trans-α,β-unsaturated esters or ketones, respectively, in high yields.
The structures of 1,2,4-trioxolanes (ozonides) (2a-2f) derived from mono-substituted alkenes (1a-1f), respectively, were determined by spectroscopic methods, such as H-1-nmr, C-13-nmr, ir, two-dimensional nmr, and mass spectra. The coupling constant of the geminal protons on the trioxolane ring is zero. This unusual coupling constant resulted from the electronegativity of two oxygen atoms near the geminal protons.
HON, YUNG-SON;LU, LING;LI, SHYH-YUAN, J. CHEM. SOC. CHEM. COMMUN.,(1990) N2, C. 1627-1628
作者:HON, YUNG-SON、LU, LING、LI, SHYH-YUAN
DOI:——
日期:——
Syntheses of α,β-Unsaturated Carbonyl Compounds from the Reactions of Monosubstituted Ozonides with Stable Phosphonium Ylides
作者:Yung-Son Hon、Ling Lu、Rong-Chi Chang、Sheng-Wun Lin、Pei-Pei Sun、Chia-Fu Lee
DOI:10.1016/s0040-4020(00)00903-0
日期:2000.11
Ozonides derived from terminal alkenes reacted with 1.3 mol equiv. of stable phosphonium ylides to give (E)-α,β-unsaturated carbonyl compounds in good to excellent yields. No reducing agent is needed in the reaction. However, alkoxyalkyl-substituted ozonides afforded a mixture of (Z)- and (E)-α,β-unsaturated carbonyl compounds under similar condition. The E/Z isomeric ratio is affected by the position