Dm. Du et al., SYNTHESIS AND PHOTOREACTION OF POLYMETHYLENEDIAMINE BIS(4-METHYL-7-COUMARINYL)OXYACETIC AMIDES, Chinese journal of chemistry, 16(5), 1998, pp. 468-472
A series of polymethylenediamine bis(4-methyl-7-coumarinyl)oxyacetic a
mides have been synthesized and their intramolecular photochemical cyc
lodimerizations have been investigated. It was found that only syn-HT
configuration products were obtained when these bisamides were directl
y irradiated in dimethyl sulfoxide solution and the yields of the prod
ucts decreased with the increase of the chain length. The structures o
f long chain amides and their intramolecular photocyclization products
were determined by IR, MS, H-1 NMR and elemental analysis.