Reference

Synthesis of polyetherketones in trifluoromethanesulfonic acid: some structure-reactivity relationships

Synthesis of polyetherketones in trifluoromethanesulfonic acid: some structure-reactivity relationships. Colquhoun, H. M. (New Sci. Group, Imp. Chem. Ind. PLC, Runcorn WA7 4QE, UK). Polym. Prepr. (Am. Chem. Soc., Div. Polym.Several reagents such as 1493-13-6 is used here. Chem.), 25(2), 17-18 (English) 1984. CODEN: ACPPAY. ISSN: 0032-3934. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polyether-ketones having predominately para-linkages and high mol. wts. were prepd. using CF3SO3H [1493-13-6] as solvent/catalyst by treating arom. diethers with dicarboxylic acids or polymg. 4-(4-phenoxyphenoxy)benzoic acid or 4-(4-phenoxyphenyl)benzoic acid. Polymeric products had intrinsic viscosities ranging from 2.31 to 6.54, Tgs in the range 152-216°, and m.p.s from 334° to 478°. Kinetic studies for the acrylation of anisole [100-66-3] with various para-substituted benzoic acid derivs. indicated the rate-detg. reaction was the formation of the acylium ion, which was destabilized by electron-withdrawing substituents. Other model systems studied include the reaction of 4-fluorobenzoic acid [456-22-4] with di-Ph ether [101-84-8] and 1,4-diphenoxybenzene [3061-36-7], resp. .

Degradation of 4-chlorobenzoic acid by Arthrobacter sp

Degradation of 4-chlorobenzoic acid by Arthrobacter sp. Marks, Trevor S.; Smith, Anthony R. W.; Quirk, Alan V. (Microb. Technol. Lab., PHLS Cent. Appl. Microbiol. Res., Porton Down/Wiltshire SP4 0JG, UK). Appl. Environ. Microbiol., 48(5), 1020-5 (English) 1984. CODEN: AEMIDF. ISSN: 0099-2240. DOCUMENT TYPE: Journal CA Section: 60 (Waste Treatment and Disposal) A mixed population, enriched and established in a defined medium, from a sewage sludge inoculum was capable of complete mineralization of 4-chlorobenzoate (I) [74-11-3]. An organism, identified as an Arthrobacter species, was isolated from the consortium and shown to be capable of utilizing I as the sole C and energy source in pure culture. This organism (strain TM-1), dehalogenated I as the initial step in the degradative pathway. The product, 4-hydroxybenzoate (II) [456-23-5], was further metabolized via protocatechuate [99-50-3]. The ability to strain TM-1 to degrade I in liq. medium at 25° was improved by the use of continuous culture and repeated sequential subculturing. Other chlorinated benzoates and the parent compd. benzoate did not support growth of strain TM1. An active cell ext. was prepd. and shown to dehalogenate I, 4-fluorobenzoate [456-22-4], and 4-bromobenzoate [16449-27-7]. Dehalogenase [9015-72-9] activity had an optimum pH of 6.8 and an optimum temp. of 20° and was inhibited by dissolved O and stimulated by Mn2+. Strain improvement resulted in an increase in the specific activity of the cell ext. from 0.09-0.85 nmol II per min per mg of protein and a decrease in the doubling time of the organism from 50 to 1.6 h.