Detail of "2396-68-1"

Reference

Anthraquinone dyes and their use in dichroic material

Anthraquinone dyes and their use in dichroic material. Blunck, Martin; Claussen, Uwe; Kroeck, Friedrich Wilhelm; Neeff, Ruetger (Bayer A.-G. , Fed. Rep. Ger.There are some reagents like 81-50-5 is used in this study.). Ger. Offen. DE 3244815 A1 7 Jun 1984, 84 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C09B001-00; C08K005-08; C09K003-34; G02B001-06. APPLICATION: DE 82-3244815 3 Dec 1982. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 74 Yellow to blue dyes of general structure I are described, where R = alkyl, aralkyl, carboxylic ester, thiocarboxylic ester, carbamoyl, aryl, alkoxy, CN, etc.; R1 = H or R; R2-R5 = H, NH2, OH, halogen, or NO2 and at least one arylthio. I, which are prepd. by known methods, have good light fastness and high order parameter (S) and are esp. useful as dyes in liq. crystal compns. for guest-host electrooptical display devices. Thus, reaction of 1-amino-4-bromo-2-methylanthraquinone [81-50-5] with 4-Me3CC6H4SH [2396-68-1] in DMF at 125-130° in the presence of K2CO3 gave bluish red I (R = Me, R1 = R4 = R5 = H, R2 = NH2, R3 = 4-Me3CC6H4S) [94176-30-4] which showed an S value of 0.69 at 0.5% concn. in a liq. cryst. mixt. of substituted cyclohexanes. The prepn. and S values of numerous other I are given. .

Pleochroic anthraquinone dyes

Pleochroic anthraquinone dyes. Thompson, David J. (Imperial Chemical Industries PLC, UK). U.S. There are some commonly used reagents like 81-58-3 in this article. US 4446047 A 1 May 1984, 14 pp. Cont.-in-part of U.S. Ser. No. 352,05. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C09K003-34; G02F001-13; C09B001-58; C09B001-60. NCL: 252299100. APPLICATION: US 82-411094 24 Aug 1982. PRIORITY: GB 81-5888 25 Feb 1981; GB 81-5890 25 Feb 1981; GB 81-29518 30 Sep 1981; US 82-352058 24 Feb 1982; GB 82-23718 18 Aug 1982. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 74 Unsym. anthraquinones I (R2, R3 = OH or SR1; R, R1 = alkyl, mono- or bicyclic aryl, cycloalkyl; R 1 R1; R2 = SR1 when R3 = OH; R3 = SR1 when R2 = OH) are prepd. for use in coloration of liq. crystals for electrooptic displays. I have high order parameters and good soly. and stability in liq. crystal materials. Thus, reaction of 1,4,5,8-tetrachloroanthraquinone [81-58-3] with PhSH [108-98-5] and 4-Me3CC6H4SH [2396-68-1] at 130-140° in DMF contg. K2CO3 gave a mixt. of anthraquinone thio derivs. with lmax 550 nm, order parameter 0.80, and soly. in liq. crystal mixt. E43 14.7% at 20°. Numerous other I were similarly prepd., and their properties in E43 were described. .