Reference

Poly(phenylene sulfides)

Poly(phenylene sulfides). (Asahi Glass Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58185625 A2 29 Oct 1983 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G075-02. APPLICATION: JP 82-67143 23 Apr 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Poly(phenylene sulfides) (I, R = H, Cl, Br, I, NO2, NH2, C1-4 alkyl, C1-2 alkoxyl, CN, carboxylic ester, dialkylamino, aldehydo, or carboxyl; m = 0-4) are prepd. in high yields from a halothiophenol (II, X = Cl, Br, I) and a hydrogen halide scavenger or from a II salt in the presence of a catalyst under ordinary pressure and at a low temp. with excellent rate of polymn. Thus, 4-bromothiophenol 20.08, tert-BuOK [865-47-4] 18.51, tetrakis(triphenylphosphine)palladium [14221-01-3] 1.27, and BuOH 125 parts were mixed under N and filtered to give 11. 14221-01-3 and 25212-74-2 are just another two chemicals used in this study.03 parts poly(4-thiophenylene) [25212-74-2] with melt viscosity 286 P. .

Use of alcoholates as volumetric solutions for alkalimetry in nonaqueous medium

Use of alcoholates as volumetric solutions for alkalimetry in nonaqueous medium. I.Several substances are used for example 18983-02-3 and 3999-70-0 which are their cas registry numbers. Preparation of titrants and stability examination. Determination of some barbiturates. Blesova, Marie; Bachrata, Maria; Bezakova, Zelmira (Dep. Pharm. Chem., Fac. Pharm., Bratislava, Czech.). Acta Fac. Pharm. Univ. Comenianae, 37, 65-87 (English) 1983. CODEN: AFPCAG. ISSN: 0301-2298. DOCUMENT TYPE: Journal CA Section: 64 (Pharmaceutical Analysis) K alcohalates 0.1 and 0.05 M, were prepd. from K and a C3-5 alc. for use in titrating barbiturates in DMF or DMSO. The higher alcoholates do not require an inert atm. for titrn. as MeOH does, and were stable for several wks. tert-BuOK [865-47-4] also was prepd. by its dissoln. in tert-BuOH-toluene (1:1 or 1:5). For end point detection by potentiometry, DMSO and iso-PrOK [6831-82-9] gave the greatest change in potential. Results for 4 barbiturates are compared with those of the 3rd Czech Pharmacopeia method. .