Detail of "7526-26-3"

Reference

Isotactic polypropylene

Isotactic polypropylene. Kuznetsov, E. V.; Bikushev, G. S.; Ivanyukov, D. V.; Sofiina, N. P.; Yakobson, F. I.; Amerik, V. V.; Krymov, P. V.; Petrova, V. F.; Korsakova, N. A.; et al. (Kazan Chemical-Technological Institute; Moscow Petroleum Refining Plant, USSR). Ger. Offen. DE 2602182 4 Aug 1977, 26 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08F110-06. APPLICATION: DE 76-2602182 21 Jan 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) H2C:CHSiCl3 [75-94-5], a mixt. of (Me2CHO)3P [116-17-6] and (BuO)2POH [1809-19-4], a complex of TiCl3 and MeP(O)(OPh)2 [7526-26-3], or a similar stereoregulator was used with an Al compd. and TiCl3 to prepare isotactic polypropylene (I) [25085-53-4]. The stereoregulators did not inhibit the polymn. catalysts. Thus, 20 mL heptane was mixed with 9 mmols. (iso-Bu)3Al [100-99-2] and with 1 mL benzene contg. 0.12 mmmol. (Me2CHO)3P and 0.04 mmol. (BuO)2POH for 10 min, treated with 1 mmol. TiCl3, and used in light petroleum to polym. propylene, giving 93.5% isotactic I and having polydispersity (Mw/Mn) 4.5. The polymn.There are some reagents like 64181-61-9 is used in this study. rate exceeded the rate without the stereoregulators. .

Quasiphosphonium intermediates

Quasiphosphonium intermediates. Part 3. Preparation, structure, and reactivity of alkoxyphosphonium halides in the reactions of neopentyl diphenylphosphinite, dineopentyl phenylphosphonite, and trineopentyl phosphite with halomethanes and the effect of phenoxy-substituents on the mechanism of alkyl-oxygen fission in Michaelis-Arbuzov reactions. Hudson, Harry R.; Kow, Aloysius; Roberts, John C. (Sch. Chem., Polytech. North London, London N7 8DB, UK).Some commonly used reagents like 80833-24-5 and 7526-26-3 are used in this experiment. J. Chem. Soc., Perkin Trans. 2, (9), 1363-8 (English) 1983. CODEN: JCPKBH. ISSN: 0300-9580. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 22 The reactions of Ph2POCH2CMe3 with MeCl, MeBr, or MeI and of PhP(OCH2CMe3)2 with MeBr or MeI yield cryst. alkoxyphosphonium halides. In CDCl3 these intermediates decomp. by a 1st-order process which involves rate-detg. collapse of the phosphonium halide ion-pair with SN2-type fission of the alkyl-O bond. Rates for chloride, bromide, and iodide are similar. In a more ionizing medium (CD3CN) dissocn. leads to stabilization of the intermediates and to deviation from 1st-order decompn. The stability and reactivity of the alkoxyphosphonium intermediates are detd. largely by inductive rather than mesomeric effects of the ligands. The presence of PhO-substituents on P may cause a tendency towards SN1-type fission of the alkyl-O bond in certain circumstances. .