Detail of "562-90-3"

Reference

Manufacture of poly(ethylene terephthalate)

Manufacture of poly(ethylene terephthalate). Tucek, Eberhard; Seifert, Juergen; Matzke, Bernd; Langner, Siegfried; Wiertelorz, Eberhard; Ahlers, Klaus Dieter; Dinse, Hans Dieter; Jugel, Werner (VEB Chemiefaserwerk Guben "Herbert Warnke", Ger. Dem. Rep.). Ger. (East) DD 230867 A1 11 Dec 1985, 11 pp. (German Democratic Republic) CODEN: GEXXA8. CLASS: ICM: C08G063-14. APPLICATION: DD 83-247884 11 Feb 1983. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 40 Poly(ethylene terephthalate) (I) with a low diethylene glycol content is prepd. simply and economically by reaction of terephthalic acid (II) (or its di-Me ester) with ethylene glycol, followed by polymn. in the presence of 0.Several reagents with their cas registry numbers 562-90-3 and 79-14-1 are used here.2-0.6 mmol Sb glycolate and 0.2-3 mmol Si(OAc)4 based on II. Heating II di-Me ester 2100, ethylene glycol 1650, Mn(OAc)2 0.470, and Co(OAc)2 0.070 kg at 190°, adding H3PO4 0.263, Sb glycolate 1.170, Si(OAc)2 0.570, and TiO2 29.4 kg, and heating at 280°/133 Pa for 210 min gave I contg. 0.7% diethylene glycol vs. 1.6% without Si(OAc)4 and 1.1% without Sb. .

Vibrational spectra of tetrakis(trifluoroacetoxy)silane and methyl(trifluoroacetoxy)silanes

Vibrational spectra of tetrakis(trifluoroacetoxy)silane and methyl(trifluoroacetoxy)silanes. Kozlova, N. V.; Kovalev, I. F.; Kirpichenko, S. V.; Voronkov, M. G. (Nauchno-Issled. Fiz.-Khim. Inst. im. Karpova, Moscow, USSR). Dokl. Akad. Nauk SSSR, 229(6), 1371-4 [Phys. 2182-66-3 and 562-90-3 which are cas registry numbers are also used here. Chem.] (Russian) 1976. CODEN: DANKAS. DOCUMENT TYPE: Journal CA Section: 73 (Spectra by Absorption, Emission, Reflection, or Magnetic Resonance, and Other Optical Properties) The IR spectra of Me, Me4-nSi(OR)n when R = COMe or COCF3 and n = 1-4 were measured at 200-3000 cm-1. The solvents were CCl4 and CS2. For the liqs., a Raman laser spectrophotometer and for the solns. a Perkin-Elmer spectrophotometer were used. The frequencies of the sym. vibration (SiOnC4-n) changes with the symmetry of the mol. and the relation of the no. of Me and trifluoroacetoxy groups. The frequency of the C:O vibration increases (40-50 cm-1) at the transition from acetoxy to trifluoroacetoxy silanes. The asym. valence vibration Si-O lies at 830-930 cm-1. The valence vibrations of C-F and C-O are also discussed. .