Reference

Preparation of tris(2,4,6-bromophenyl) phosphite useful as flame retardant for polystyrene

Preparation of tris(2,4,6-bromophenyl) phosphite useful as flame retardant for polystyrene. Shimizu, Kozo; Arai, Takeshi (Kawaguchi Chemical Industry Co., Ltd., Japan).In this study， 7046-65-3 and 9003-53-6 are also used. Japan. Kokai JP 52028539 3 Mar 1977 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08K005-51. APPLICATION: JP 75-104147 29 Aug 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Tris(2,4,6-tribromophenyl)phosphite (I) [7046-65-3], useful as a flame retardant for polystyrene (II) [9003-53-6], is prepd. Thus, a mixt. of 99.3 g 2,4,6-tribromophenol [118-79-6] and 23.7 g pyridine was heated at 80-5.degree., mixed with 13.8 g PCl3, heated to 130.40.degree., strirred 4 h, cooled, and filtered. The filtrate was washed and concd. to give I (m.p. 166.5-7.5.degree.) which (2 parts) was mixed with 100 II and molded to give a 10-mm flame-resistant sheet. .

Poly(oxydihalophenylene)

Poly(oxydihalophenylene). III. The effect of copper(II) salts or certain bases on the condensation polymerization of 2,4,6-tribromophenol. Hirose, Masanori; Kurahashi, Tsuneo; Imamura, Yoshio (Fac. Sci., Sci. Univ. Tokyo, Tokyo, Japan). Nippon Kagaku Kaishi, (3), 403-8 (Japanese) 1977.Several reagents with their cas registry numbers 64-20-0 and 108-48-5 are used here. CODEN: NKAKB8. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) When 2,4,6-tribromophenol [118-79-6] was polymd. in DMF at room temp. in the presence of CuCl2 and NaHCO3, the polymer yield reached 100% in <10 min, and the mol. wt. of the polymer increased for several h. The effect of various bases on the polymer yield and polymer mol. wt. was examd., and the results indicated that bases interacted with the monomer to promote dissocn. The catalytic activities of Cu(II) salts were closely related to Taft's substituent const. .