Detail of "2058-02-8"

Reference

Anthraquinone dyes for liquid crystal displays

Anthraquinone dyes for liquid crystal displays. (Mitsubishi Chemical Industries Co., Ltd.; Hitachi, Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58145759 A2 30 Aug 1983 Showa, 10 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09B001-22; C09B001-503; C09K003-34; G02F001-137; G09F009-00; G09F009-35. APPLICATION: JP 81-173618 29 Oct 1981. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) The title dyes I ( R = trans-4-substituted cyclohexyl; R1, R2 = NH2, OH; R3 = H, CN) useful in guest-host liq. 86183-79-1 and 86183-89-3 which are cas registry numbers of chemicals are mentioned. crystal displays were prepd. Thus, 1-amino-4-nitroanthraquinone-2-carboxylic acid [2058-02-8] was converted to the carbonyl chloride [25665-00-3] which was then treated with trans-4-butylcyclohexanol [67590-13-0] in o-C6H4Cl2 at 140° for 1 h, neutralized with Et3N, treated with aq. (NH4)2S at 80° for 4 h, extd. with CHCl3, and chromatographed to give trans-I (R = 4-butylcyclohexyl; R1 = R2 = NH2; R3 = H) [86183-79-1] with order parameter (S) 0.77. .

Anthraquinone dyes and liquid crystal compositions containing the dyes

Anthraquinone dyes and liquid crystal compositions containing the dyes. Imazeki, Shuji; Mukoh, Akio; Sato, Mikio; Kaneko, Masaharu; Ozawa, Tetsuo; Yoneyama, Tomio (Mitsubishi Chemical Industries Co., Ltd. ; Hitachi, Ltd. , Japan). Eur. Pat. Appl. EP 120717 A2 3 Oct 1984, 36 pp. DESIGNATED STATES: R: CH, DE, FR, GB, LI. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C09B001-58; C09B001-62; C09K003-34. APPLICATION: EP 84-302158 29 Mar 1984. PRIORITY: JP 83-53175 29 Mar 1983. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 74 Twenty-four pleochroic anthraquinone dyes (I; R = C1-9 alkyl, alkoxyalkyl, (un)substituted cyclohexyl, (un)substituted phenyl; R1 = C1-18 alkyl, alkoxyalkyl, (unsubstituted aryl, cycloalkyl, furfuryl, aralkyl, allyl) were prepd., and their order parameters (S) in liq. 2058-02-8 is just another one chemical used in this study. cryst. compn. ZLI-1132 were measured. The lmax and S values of I were in the 580-602 nm and 0.70-0.79 range, resp. Thus, reaction of 1-amino-4-nitroanthraquinone-2-carboxylic acid [2058-02-8] with p-tolyl mercaptan [106-45-6] at 40-45° in N-methypyrrolidone contg. K2CO3 gave 1-amino-4-(p-tolylthio)anthraquinone-2-carboxylic acid (II) [93970-31-1]. Reaction of II with trans-4-butylcyclohexanol [67590-13-0] at 105-110° in o-C6H4Cl2 contg. p-MeC6H4SO3H gave I (R = trans-4-butylcyclohexyl, R1 = C6H4Me-p) [93970-54-8] with lmax 588 nm and S 0.77. Several liq. crystal compns. contg. I are described in detailed examples. .