Zuo Hong-liang
2007
Citations
0
Influential Citations
2
Citations
Journal
Fine chemicals
Abstract
Four bifunctional light stabilizers which have a benzotriazole and a hindered amine moieties in the same molecule were synthesized from 3-(3'-tert-butyl-4'-hydroxyphenyl)propionic acid and o-nitroaniline or o-nitro-p-chloroaniline by the reactions of diazotization and diazo coupling,reduction,esterification and finally transesterification with 2,2,6,6-tetramethyl-4-hydroxypiperidine or 1,2,2,6,6-pentamethyl-4-hydroxypiperidine in the absence of solvent.The total yields of the four steps are 2,2,6,6-tetramethylpiperidin-4-yl 3-{3-(2H-benzo[d][1,2,3]triazol-2-yl)-5-tert-butyl-4-hydroxyphenyl} propionate 48.3%,1,2,2,6,6-pentamethylpiperidin-4-yl 3-{3-(2H-benzo[d][1,2,3]triazol-2-yl)-5-tert-butyl-4-hydroxyphenyl} propionate 47.0%,2,2,6,6-tetramethylpiperidin-4-yl 3-{(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-5-tert-butyl-4-hydroxyphenyl} propionate 45.7%,and 1,2,2,6,6-pentamethylpiperidin-4-yl 3-{(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-5-tert-butyl-4-hydroxyphenyl} propionate 44.4%.Their structures were characterized by 1HNMR,MS and IR.Their UV-spectra were measured.These compounds have bifunctional effects of UV-absorbing and radical trapping.