Synthesis of photochromic benzopyrans annulated by 15(18)-crown-5(6) ether
作者:S. V. Paramonov、O. A. Fedorova、V. P. Perevalov、V. Lokshin、V. Khodorkovsky
DOI:10.1007/s11172-008-0339-6
日期:2008.11
The reaction of hydroxy-substituted benzo-15(18)-crown-5(6) ether or benzo-18-crown-6 ether with β-phenylcinnamaldehyde in the presence of titanium tetraethoxide yielded crown-annulated 2,2-diphenylbenzopyrans. The compounds are photochromic, and the spectral characteristics of their colored form are unusual for this class of chromenes.