Synthesis and Photochromic Properties of Cycloalkylidene Fulgides
作者:Teck-Peng Loh、Wei-Woon Wayne Lee、Leong-Ming Gan
DOI:10.1055/s-2005-917082
日期:——
A series of cycloalkylidene fulgides have been synthesized using β,γ-unsaturated diesters, instead of the usual α,β-unsaturated diesters. A study of their photochromic properties revealed that an increase in the cycloalkylidene ring size caused a subsequent decrease in the formation of the closed form from the open form.
The reaction of carbon monoxide with substituted 2-butyne-1,4-diols by pd(OAc)2/I2 catalyst gives derivatives of dimethylenesuccinic anhydride, “fulgides”, in high yields.
three photochromic fulgide derivatives in toluene solution were investigated by means of picosecond and femtosecond laserphotolysis methods. Femtosecond laser irradiation revealed that the cycloreversion processes upon visible one-photon excitation took place within a few ps in these three derivatives. On the other hand, drastic enhancements of the reaction yield were observed under picosecond laser