Reference

Phase-transfer catalysis of phosphonium ions derived from poly[(p-phenyl)trimethylenephosphine]

Phase-transfer catalysis of phosphonium ions derived from poly[(p-phenyl)trimethylenephosphine]. Kobayashi, Shiro; Suzuki, Masato; Sakaya, Taiichi; Saegusa, Takeo (Fac. Eng.In this study， 143-33-9 and 78869-65-5 are also used., Kyoto Univ., Kyoto 606, Japan). Makromol. Chem., 188(3), 457-62 (English) 1987. CODEN: MACEAK. ISSN: 0025-116X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 38 Polymeric phosphonium ion species having different content of phosphonium units were prepd. from reduced poly(2-phenyl-1,2-oxaphospholane) which was then treated with 1-iodohexadecane. Phase-transfer catalysis of the phosphonium polymers was examd. by means of a typical SN2 reaction between 1-bromooctane [111-83-1] and NaCN in a biphase system. The apparent rate const. (kobs) was detd., its magnitude being smaller by about one order than that of the corresponding monomeric model dibutylhexadecylphenylphosponium iodide [107701-58-6]. Crosslinked polymeric phosphonium ion species were coated on powd. alumina and used as a phase-transfer catalyst for the SN2 reaction in a triphase system. Due to the inhomogeneous reaction, the kobs value was much smaller (1/5) than that in the presence of the uncrosslinked phosphonium polymer. .

Polymer-supported poly(alkyleneglycol ethers)

Au, Andrew T.; Freedman, Harold H. (Dow Chemical Co., USA). U.S. US 4173693 6 Nov 1979, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08F008-00; C08F008-18. NCL: 525329000. APPLICATION: US 78-868942 12 Jan 1978. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 23, 25, 27 Polyalkylene glycols linked to solid polymeric supports such as chloromethylated polystyrene (I) are useful as phase-transfer catalysts for a variety of reactions, including displacement and alkylation. Thus, 2 g chloromethylated I (1 mequiv Cl/g) and 2 g polyethylene glycol monotridecyl ether of d.p. 6.5 were stirred at 65° in THF with 2 g NaOH, treated with 0.9 g Bu4NCl over 8 h, and stirred an addnl. 7 h, giving catalyst beads (A) contg. 45% glycol ether. Treating octyl bromide [111-83-1] with an equimolar amt. of NaI in toluene at 80° for 5 h in the presence of 5.7 mol% A gave a 53.0% yield of the displacement product octyl iodide [629-27-6]. The catalyst was recycled 5 times to the reaction with no apparent loss of activity.