Reference

Simple method for iodination of polystyrene

Simple method for iodination of polystyrene. Stefanenko, G. M.; Siyanko, P. I.; Merkushev, E. B. (Tomsk. Politekh. Inst., Tomsk, USSR). Vysokomol.Several substances with their cas registry numbers 9003-53-6 and 76-05-1 may be metioned in this study. Soedin., Ser. B, 29(3), 181-2 (Russian) 1987. CODEN: VYSBAI. ISSN: 0507-5483. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polystyrene was iodinated in presence of a system of PhI(OAc)2 (I) [3240-34-4] and F3CCO2H (II) [76-05-1]. A rapid exchange reaction between I and II led to the in-situ generation of PhI(O2CCF3)2, which reacted with iodine to form CF3C(O)OI as the source of electrophilic iodine to attack the polymer. Iodination occurred at the para position. .

New dyes based on 3-arylbenzo- and -naphtho-1,4-thiazines

MacKenzie, Neil E.; Thomson, Ronald H.; Greenhalgh, Colin W. (Dep. Chem., Univ. Aberdeen, Aberdeen AB9 2UE, Scot.). J. Chem. Soc., Perkin Trans. 1, (12), 2923-32 (English) 1980. CODEN: JCPRB4. ISSN: 0300-922X. DOCUMENT TYPE: Journal CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 26, 28 3-Aryl-2H-1,4-benzothiazines were converted into cyanine dyes by condensing their perchlorates with aldehydes, and into azo compds. by coupling with reactive diazonium salts. E.g., condensation of the perchlorate [76149-00-3] of benzothiazine I with 4-Me2NC6H4CHO [100-10-7] gave 70% blue perchlorate II [76149-01-4], the free base of which was orange, whereas I [76148-93-1] coupled with 4-MeO2CC6H4N2+SO4- [76148-96-4] to give 65% azo dye III (R = OMe, R1 = CO2Me) [76148-95-3]. The azo compds. were also obtained by condensing arylglyoxal hydrazonyl bromides with 2-H2NC6H4SNa [52380-58-2]. E.g., PhCOCBr:NNHPh [55716-62-6] condensed with 2-H2NC6H4SNa to give 84% III (R = R1 = H) [76148-94-2]. 2-Amino-3-mercapto-1,4-naphthoquinone (IV) [76148-76-0] condensed with w-bromoacetophenones to give naphthothiazinequinones. E.g., IV with BrCH2COC6H4OMe-4 [2632-13-5] gave 95% naphthothiazinequinone V (R = OMe, R1 = R2 = H) [76148-98-6]. Attempts to dehydrate the naphthothiazinequinones gave a variety of products; reactions included extrusion of S and loss of H2O giving indolequinones and oxidative dimerization of the quinones. Oxidn. of V (R = R1 = R2 = H) [76148-97-5] with iodosobenzene diacetate [3240-34-4] in AcOH gave 45% V (R = H, R1 = Et, R2 = OAc) [76148-99-7] by an indirect Pummerer oxidn.