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Some 2,6-di(para-x-phenyl)-4,4-diphenyl-4h-pyrans and analogous 1,4-dihydropyridines from 1,5-dione precursors

A. Kurfȕrst, J. Zelený, M. Schwarz, and J. Kuthan

Department of Organic Chemistry, Institute of Chemical Technology, CS-166 28 Prague

 

Abstract: Substituted l,3,3,5-tetraphenyl-l,5-pentadiones Ia—Id obtained by al­kaline ketolization of the corresponding acetophenones with benzophenone, have been subjected to intramolecular cyclocondensation to give 4H-pyrans Ha—lid and 1,4-dihydropyridines Ilia—11If. Mass spectrometric frag­ mentation of the above-mentioned compounds is discussed. The compounds la, lb, lIb—lId, IlIa—IIIf in crystalline state showed photochromy.

Full paper in Portable Document Format: 415a623.pdf

 

Chemical Papers 41 (5) 623–634 (1987)

Wednesday, June 26, 2019

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