作者:Alexandru C. Razus、Carmen Nitu、Victorita Tecuceanu、Valentin Cimpeanu
DOI:10.1002/ejoc.200300346
日期:2003.12
An easy and efficient solvent-free synthesis of 1-(azulen-1-yl)-2-aryl- and heteroarylethenes is described. The reaction was performed simply by melting solid mixtures of azulenic Schiff bases and arylacetic acids, the crude products being purified by column chromatography. Limitations of the method were established by study of a large range of aryl and heteroarylacetic acids and also by examination
Photochemical Cis to Trans One-Way Isomerization of Styrylazulenes on Their Triplet Excited State. Examination of Ethylenes with Non-Benzenoid Substituents of Low Triplet Energies
one-way isomerization from the cis to the trans isomer on triplet sensitization. Their triplet states as intermediates of the isomerization were observed by laserflashphotolysis. However, their excitation to either the lowest excited singlet state (S1) or the second excited singlet state (S2) by direct irradiation afforded photostationary mixtures comprising 98% of the trans and 2% the cis isomers