Showing papers on "Benzopyran published in 1971"
TL;DR: In this article, the 2H-compounds are converted into the 4H-isomers when heated with alkoxy- or phenoxy-magnesium bromides, which is the most straightforward route to 2-phenyl-4H-1-benzopyrans (flav-2-enes).
Abstract: Phenoxymagnesium bromides react with cinnamaldehyde selectively in the position ortho to the oxy-substituent to yield diphenyl(styryl)methane derivatives (III). When a suitable substituent is located near the position of electrophilic attack, the reaction leads to mixtures of 2-phenyl-4H- and 2H-1-benzopyrans in a ratio which depends on the experimental conditions. The 2H-compounds are converted into the 4H-isomers when heated with alkoxy- or phenoxy-magnesium bromides. This method is the most straightforward route to 2-phenyl-4H-1-benzopyrans (flav-2-enes).
9 citations
9 citations
Patent•
16 Jul 1971
TL;DR: CERTAIN AMINO ACID ESTER DERIVATIVES and their ACID ADDITON SALTS as discussed by the authors have anti-dePRESSENT and anti-ANXIETY PROPERTIES.
Abstract: CERTAIN AMINO ACID ESTER DERIVATIVES AND THEIR ACID ADDITON SALTS WHICH HAVE ANTI-DEPRESSENT AND ANTI-ANXIETY PROPERTIES. THE AMINO ACID ESTER GROUP IS AN ESTERIFIED 5OH PYRIDYL BENZOPYRAN.
1 citations
Patent•
10 Sep 1971
1 citations