Dyarylacetylenes, their preparation and their use

Abstract From the Canadian patent

Disclosed are novel diarylacetylene of the formula I:, I, where R1 and R2 are each hydrogen or methyl R3 is hydrogen, methyl, hydroxyl or C1-C6-alkoxy R4 is hydrogen, methyl or, methoxy, R5 is hydrogen halogen, methoxy or C1-C4-alkyl, A, is a methylene or ethylene radical which is unsubstituted or substituted by C1-C4-alkyl or is -CH=CH- -CHOH-CH2- or, -CO-CH2-, and R is hydrogen methyl, nitrile, tetrazolyl, C2-C10-ketal or a radical -CHR7-OR8 -CHR7-NR9R10, -COR11, -CR12=CH-COOR13 or -CR12=CH-CO-NR14R15 where R7 is hydrogen, or C1-C4-alkyl, R8 is hydrogen C1-C4-alkyl, C1-C20-, alkanoyl, unsubstituted or substituted benzoyl or a radical -P(0) (OR13)2 or -P(0) (NR14R15)2 (where R13 is …