Detail of "52184-29-9"

Reference

2-Phenylbenzotriazole N-oxides

2-Phenylbenzotriazole N-oxides. Seino, Shuichi (Chempro Kasei K.In this study， 51656-57-6 and 52184-29-9 are also used. K., Japan). Jpn. Kokai Tokkyo Koho JP 61197571 A2 1 Sep 1986 Showa, 5 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C07D249-20. ICS: B01J031-02. APPLICATION: JP 85-38218 27 Feb 1985. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) The title compds. (I; R = H, Cl, C1-4 alkyl, C1-4 alkoxy, CO2H, SO3H; R1 = H, Cl, C1-4 alkyl, C1-4 alkoxy; R2 = H, Cl, C1-12 alkyl, C1-4 alkoxy, Ph, C1-8 alkyl-substituted Ph, OPh, phenyl-C1-4 alkyl; R3 = H, Cl, OH, C1-4 alkoxy; R4 = H, C1-12 alkyl, phenyl-C1-4 alkyl), useful as intermediates for UV-absorbing 2-phenylbenzotriazoles, were prepd. by reducing o-nitroazobenzene derivs. II with sugars in the presence of a hydrogen transfer catalyst and a base. Thus, treating II (R = Cl, R1 = R3 = H, R2 = Me, R4 = Me3C) with 2,3-dichloro-1,4-naphthoquinone and glucose in alk. MeOH at 40-45° gave 96.0% I (R = Cl, R1 = R3 = H, R2 = Me, R4 = Me3C). .

2-(2-Hydroxyphenyl)benzotriazoles

2-(2-Hydroxyphenyl)benzotriazoles. (Ciba-Geigy A.-G., Switz.). Fr. Demande FR 2292708 25 Jun 1976, 12 pp. (French). (France). CODEN: FRXXBL. CLASS: IC: C07D249-20. PRIORITY: CH 73-16636 27 Nov 1973. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Benzotriazoles I (R = Cl, R1 = H, R2 = R3 = Me3C, n = 0; R = H, R1 = Cl, R2 = PhCHMe, R3 = Ph, n = 0) were prepd. in 90-91.5% yields by reductive cyclization of azobenzenes II by refluxing in (R4OCH2CH2)2O (R4 = Me, Et) contg. H2NNH2 in presence of alk. hydroxide. Thus, II ( R = Cl, R1 = H, R2 = R3 = Me3C) in (EtOCH2CH2)2O contg. NaOH heated at 85.degree. followed by the addn. of H2NNH2 and subsequent heating at 90.degree. for an h gave 90% I (R = Cl, R1 = H, R2 = R3 = Me3C, n = 0). Heating a mixt. of the oxide I (R = Cl, R1 = H, R2 = Me3C, R3 = Me, n = 1) in (MeOCH2CH2)2O contg.In this experiment, several chemicals are used like 22617-00-1 and 52184-29-9 KOH at 135.degree. for 3 h in the presence of H2NNH2 gave 92% I (R = Cl, R1 = H, R2 = Me3C, R3 = Me, n = 0). .