Reference

Fluoro and alkoxy derivatives of benzobisthiazole and imidazobenzothiazole

Fridman, S. G.; Kotova, L. I. (Inst. Org. Khim., Kiev, USSR). Ukr.There are some reagents like 42222-48-0 is used in this study. Khim. Zh. (Russ. Ed.), 44(6), 637-44 (Russian) 1978. CODEN: UKZHAU. ISSN: 0041-6045. DOCUMENT TYPE: Journal CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 28 Benzobisthiazoles I (R = CF3, p-FC6H4, p-MeOC6H4) and imidazobenzothiazoles II (R = CF3, p-FC6H4) were prepd. by condensation of RCO2H or RCOCl with 6-amino-2-methyl-7-benzothiazolethiol (III) [42222-48-0] or K 5-amino-2-methyl-1-phenyl-1H-benzimidazole-4-thiolate [67748-35-0], resp., quaternized with p-MeC6H4SO3Et [80-40-0], and converted to cyanine dyes (20) by std. reactions. In unsym. cyanines the benzo[1,2-d:4,3-d']bisthiazole and imidazo[4,5-g]benzothiazole nuclei showed basicities close to that of the benzothiazole nucleus. Attempts to prep. I (R = 2-benzothiazolyl) from III and benzothiazole-2-carbonyl chloride [67748-61-2] gave only the N,S-diacyl deriv. [67748-65-6]. .

Nonclassical urea oligomers

Nonclassical urea oligomers. 2. Solvation-assisted polymerization of 1-(N-phenylcarbamoyl)aziridine by sulfur:oxygen or phosphorus:oxygen containing compounds and specific absorption of the compounds to the polymer. Araki, Takeo; Tsukube, Hiroshi; Nogami, Fumio; Nagata, Koichi (Fac. Sci., Osaka Univ., Toyonaka, Japan). Macromolecules, 10(4), 831-7 (English) 1977. CODEN: MAMOBX. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The coarse of the polymn. reaction of 1-(N-phenylcarbamoyl)aziridine (I) was controlled by a solvation-assisted mechanism in the presence of a no. of S:O and P:O compds. Polymers were obtained in EtOAc at 60.degree. in the presence of Et2SO4 [64-67-5] and 12 other S:O and P:O compds. and in all cases the I polymer [64069-52-9], d.p. 8, obtained had absorbed different amts. of the compd. Of the S:O compds. used only Et2SO4 and Et p-toluenesulfonate [80-40-0] were catalytically active without a cocatalyst. The activity of the P:O compd. was weaker than that of the corresponding S:O compds. but the solvating effect was clearly obsd. for all the P:O compds. when a catalytic amt. of Et2SO4 was present. Triphenyl phosphate [115-86-6] was the only P:O compd. which initiated polymn. without a cocatalyst. The affinity of the polymer was estd. by detg. the reabsorption of Et2SO4 after the other absorbed compds. were removed. The compds. were classified into 3 types on the basis of the affinity for the I polymer as a function of catalyst activity. These types were, S:O compds. in which both catalyst activity and affinity were in the reverse order of the H bond accepting nature; S:O compd. in which catalyst activity is the reverse of the H bond accepting property and affinity is the same as this factor; and P:O compds. which behaved similarly to these later S:O compds. The I monomer did not form stable mol. complexes with the S:O or P:O compds. but the solvation of these compds. by the monomer involved an interaction which caused dissocn. of monomer aggregates. The solvated monomer was more active than the aggregated monomer and the solvation prevented side reactions.