Reference

Polyesters derived from furan and tetrahydrofuran nuclei

Polyesters derived from furan and tetrahydrofuran nuclei. Moore, J. A.; Kelly, J. E. (Dep. Chem., Rensselaer Polytech. Inst., Troy, N. Y., USA). Macromolecules, 11(3), 568-73 (English) 1978. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 27 Polyester derived from 2,5-furandicarboxylic acid [3238-40-2] and 2,5-bis(hydroxymethyl)furan [1883-75-6] or 1,6-hexanediol, as well as polyesters derived from cis- [2240-81-5] and trans-tetrahydrofuran-2,5-dicarboxylic acid [2044-00-0] and ethylene glycol or 2,5-cis- [2144-40-3] and 2,5-trans-bis(hydroxymethyl)tetrahydrofuran [1122-89-0] were prepd. and characterized. The sensitivity of the heterocyclic monomers to traces of O at high temps. made soln. polymn. the most effective route for polymer prepn. The polymer with lowest glass transition temp. in the completely reduced furan system was that in which diacid and diol were both of cis configuration.

Anion-exchange liquid chromatography for biological compounds

Anion-exchange liquid chromatography for biological compounds. (Mitsubishi Chemical Industries Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58216955 A2 16 Dec 1983 Showa, 9 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: G01N031-08; B01D015-08; B01J020-26; G01N033-50. APPLICATION: JP 83-50888 26 Mar 1983. DOCUMENT TYPE: Patent CA Section: 9 (Biochemical Methods) Biol. compds. are detected or detd. in body fluids by high-performance anion-exchange chromatog. on an anion-exchange resin that is a copolymer of divinylbenzene and styrene which is chloromethylated and treated with Me3N to introduce quaternary ammonium groups. This porous copolymer has a sp. surface area >0.5 m2/g, particle size <20 mm, and pore vol. >0.05 mL/g. For example, a copolymer of divinylbenzene and styrene was prepd., extd. with C6H6, and treated with (ClCH2)2O followed by trimethylamine in C6H6 to introduce quaternary ammonium groups into the polymer. This polymer was packed in a HPLC column for urine anal. The column was eluted with HOAc-NH4OAc buffer (pH 4.4) with a gradient from 0.006 to 6. 3238-40-2 and 9003-70-7 which are cas registry numbers of chemicals are mentioned.0M at a flow rate of 0.71 mL/min. The column temp. was also increased from 22 to 60° at a rate of 1.52°/min. With 100 mL of filtered urine, 27 biol. compds., e.g., amino acids, drugs, creatine, were detected at 254 nm. .