P. Jindal, Rimpy Bhatia, Sadhika Khullar
Feb 19, 2014
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Journal
Photochemical & Photobiological Sciences
Abstract
5-(Thiophen-3-yl)pyrano[2,3- c ]chromen-2(3 H )-ones ( 2 ), angular tricyclic compounds, were synthesized in significantly high yields through the photoinduced intramolecular coupling of the acetylenic group with the carbonyl centre in 3-(prop-2-ynyloxy)-2-(thiophen-3-yl)-4 H -chromen-4-ones ( 1 ). This photoreaction is a case of an intramolecular Paterno–Buchi reaction and is unprecedented in 3-propynyloxy-chromenones. The structure of 2 has been determined by spectroscopic (FTIR, NMR and mass) and single crystal X-ray crystallographic studies.