Studies on Phenanthrene Derivatives. IV. Syntheses of 2, 3 : 5, 6-Bismethylenedioxy and 2, 3 : 6, 7-Bismethylenedioxyphenanthrene and Ultraviolet Absorption Spectra of Certain Methylenedioxyphenanthrenes.

Abstract

2, 3 : 5, 6-Bismethylenedioxyphenanthrene (X) and 2, 3 : 6, 7-bismethylenedioxyphenanthrene (XI) were synthesized from 6-nitropiperonal (I) and homopiperonylic acid (II) by the Pschorr reaction. The structure of the compounds was determined by an unequivocal synthesis using 6-bromopiperonylic acid. The ultraviolet absorption spectra of several kinds of phenanthrenes possessing methylenedioxy group at 2, 3-or 3, 4-position were determined in ethanolic solution.