| abstract |
New cpds. are of formula (I), where R1, R2 = H, 1-8C alkyl, 5-8C cycloalkyl, 7-12C aralkyl, 7-14C cycloalkylalkyl, aryl or carbon ester, or R1 with R2 = tetra- to hexa-methylene gp. or opt. substd. fluorene-type ring of specified formula; X, Y = O, S or NR8 where R8 = H, 1-8C alkyl, or 7-12C aralkyl; R3, R4 = 1-22C alkyl (opt. substd. by ether O, S or N), 1-22C alkenyl, 3-12C cycloalkyl, opt. substd. 7-12C aralkyl, OH, 3-12C alkynyl, opt. substd. nonaromatic heterocyclic gp. (except 2,2,6,6-tetra-alkylpiperidine when R3=R4), 1-22C alkyl substd. by heterocyclic gp. (except 2,2,6,6-tetra-alkylpiperidine when R3=R4), 1-22C alkyl substd. by amino, OH, Cl, Br, I, sulphone, sulphoxide, urethane or urea gp., COOH, carbon ester and/or opt. substd. carbamoyl, or together = B-A-, where A = bridge member and B = SH or CN or gp. of formula -COOR5, -CONR6R7, -SO2NR6R7; R5 = H, 1-22C alkyl, 5-8C cycloalkyl, 7-12C cycloalkylalkyl, aralkyl, opt. substd. aryl, heterocyclic, or 1-22C alkyl contg. heterocyclic gp.; R6, R7 = H, 1-22C alkyl, 2-9C alkyl contg. ether O, 7-12C aralkyl, opt. substd. aryl, heterocyclic, or 1-22C alkyl contg. heterocyclic gp., or R6 and R7, together with atom(s) to which they are linked, form 3- to 12-membered ring. Pref. R1 and R2 = organic gps., or one = H, or if both = H then X and Y are not both = O, and range of substits. in alkyl gps. is restricted. |