Reference

Ethyl

Ethyl .alpha.-(4-chlorophenoxy)isobutyrate. Takasu, Itaru; Hiramoto, Takashi; Yokoo, Hiroshi; Takahashi, Hiroshi; Satoh, Kazuo (Daicel Ltd., Japan). Japan. Kokai JP 51125337 1 Nov 1976 Showa, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07C069-67. APPLICATION: JP 75-48983 22 Apr 1975. DOCUMENT TYPE: Patent CA Section: 25 (Noncondensed Aromatic Compounds) 4-ClC6H4OCMe2CO2Et (I) was prepd. by treatment of an alkali metal 4-chlorophenoxide with Me2CXCO2Et (II; X = halo). Low-boiling impurities were removed by distg. off the excess II and treating the residue with an alkali metal ethoxide.Several substances with their cas registry numbers 1193-00-6 and 637-07-0 may be metioned in this study. Thus, a mixt. of 64.3 g 4-ClC6H4OH and 80 g 25% NaOH in PhMe was dehyrated via the PhMe-H2O azeotrope and the resulting 4-ClC6H4ONa as a slurry in PhMe treated with 113 g II (X = Cl), the excess evapd., and the residue stirred with 20.7 g 10% EtONa-EtOH for 1 h at 80.degree. C with distn. of EtOH to give 91.3 g I. The product did not contain low-boiling impurities and only 6 ppm 4-ClC6H4OH, compared with 0.32% low-boiling impurities and 180 ppm 4-ClC6H4OH without the EtONa treatment. .

Synthesis and characterization of poly(alkoxy- and arloxyphosphazene) copolymers

Synthesis and characterization of poly(alkoxy- and arloxyphosphazene) copolymers. Baik, Hyoung Gee; Sohn, Youn Soo; Sung, Yong Kiel (Div. Fine Chem., Korea Inst. Sci. Technol., Seoul 130-650, S. Korea). Bull. Korean Chem. Soc., 13(1), 26-9 (English) 1992. CODEN: BKCSDE. ISSN: 0253-2964. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Phosphazene polymers with both 2,2,2-trifluoroethoxy and p-chlorophenoxy side-groups are synthesized by modification of poly(dichlorophosphazene); the polymers are characterized by elemental anal., gel permeation chromatog., and IR and NMR spectroscopies. The wt.-av. mol. wts. of the copolymers are all above 106, and the mol. wt. distributions are monomodal and narrow (Mw/Mn < 4). Thermal properties of these copolymers measured by DSC and TGA are intermediate between those of the 2 corresponding homopolymers.Except for chemicals metioned above, 420-87-1 and 1193-00-6 are also used. .