1985 Volume 1985 Issue 7 Pages 1516-1517
Syntheses of several N-octadecylsquarylium dyes were studied in order to improve their preparation so far in use. In one typical run, a mixture of 1-octadecyl-2, 3, 3-trimethyl-3H-indolium p-chlorobenzenesulfonate (2 mol) and squaric acid (1 mol) was refluxed in 1pentanolchlorobenzene (3: 2 vol.) for 24 h to form the bluish green dye. In another typical run, the above mixture was heated at 160°C for 5 h in the presence of Nafion-H catalyst. Yield of the squarylium dye obtained by the second method was better than that by the first method.
The analogous s quarylium dyes were also produced by using N-octadecyl intermediates derived from 2-methylbenzoselenazole, 2-methylbenzothiazole, N-methylaniline and Nmethylm-toluidine according to those two methods.
This article cannot obtain the latest cited-by information.
