EXPERIMENTS ON THE SYNTHESIS OF CYANOMACLURIN AND RELATED SUBSTANCES. PART II

6-Methoxycoumaranone has been condensed with salicylaldehyde, \(\beta\)-resorcylaidehyde, 2-hydroxy-4- methowyhenzaldehyde, 2-hydroxy-4 :6-dimethoxybenzaidehyde and 2-hydroxynaphthaldehvde in presence of pipenidine to give the corresponding arylidene-coumaranones in good yields. Excepting 6-methoxy-2- (2 :4-dihydroxybenzylidene)-coumaranonc, all these arylidene-coumaranones are reduced to the corresponding aryl derivatives. The aryl-coumaranones have been cyclised by means of phosphorus pentoxide the corresponding chromene derivates.