SYNTHESIS OF PHOTOREACTIVE POLYMERS BY A DISTANNOXANE CATALYZED TRANSESTERIFICATION - POLYCONDENSATION OF ALPHA,OMEGA-DICARBOMETHOXY-1,4-OLIGOBUTADIENE WITH A PHOTOREACTIVE DIOL

Optimal conditions for distannoxane catalyzed transesterification of m ethyl esters with benzylic alcohols were established by studying the p olycondensation of hex-3-ene-1,6-bis(methyl oate) (1) with 1,4-bis(hyd roxymethyl)benzene (2). alpha,omega-Dicarbomethoxy-1,4-oligobutadiene (3) was obtained by cross metathesis between cycloocta-1,5-diene and 1 . The synthesis of 1,4-bis[4-(hydroxymethyl)cinnamoyl]-benzene (4) wer e conducted starting from 4-(diethoxymethyl)benzaldehyde (5) and 1,4-d iacetylbenzene Finally the organosoluble polyester (PE3/4)were synthes ized by reacting 3 with 4 and the occurrence of crosslinkings by UV ir radiation was checked.