Detail of "678-78-4"

Reference

Perfluoroalkylene ether imidate and thioimidate esters

Perfluoroalkylene ether imidate and thioimidate esters. Evers, Robert C. (United States Dep. of the Air Force, USA). 63037-59-2 are also occured in this study. U. S. Pat. Appl. US 710089 30 Jul 1976, 16 pp. Avail. NTIS. (English). (United States of America). CODEN: XAXXAV. APPLICATION: US 76-710089 30 Jul 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 23 Perfluoroalkylene ether (thio)imidates, (HN:)RCZCR(:NH) (I) (R = SEt or OCH2CF3, Z = (CF3)CF[OCF2CF(CF3)]xO(CF2)5O[CF(CF3)CF2O]yCF(CF3), (CF3)CFOCF2CF(CF3)O(CF2)4, x + y = 0, 4, 5), were prepd. from EtSH [75-08-1] or CF3CH2OH [75-89-8] and the corresponding dinitrile to prep. fluorinated polybenzoxazoles which are heat and hydrolysis stable. Thus, hexafluoroglutaryl fluoride [678-78-4] was added to a slurry of CsF, and the product was treated with hexafluoropropylene oxide [428-59-1] to form an acid fluoride analog [63055-43-6] of I, which was in turn converted into the Me ester, amidated, and reduced to the analogous dinitrile (II) [63055-42-5] (Z = oligomeric deriv., x + y = 4 or 5). Treatment of II with EtSH in the presence of Et3N gives the thioimidate [63055-45-8], which polymns. with 4,4'-(decafluoropentamethylene)bis[[oxy(tetrafluoroethylene)]-3-aminop henol] to give a fluorinated polybenzoxazole [63143-13-5]. .

Chelation of gas-phase anions

Chelation of gas-phase anions. An ion cyclotron resonance study of cooperative binding to fluoride and chloride ions. Larson, J. W.; McMahon, T. B. (Dep. Chem., Univ. New Brunswick, Fredericton, NB E3B 6E2, Can.). J. Phys. Chem., 88(6), 1083-6 (English) 1984. CODEN: JPCHAX. ISSN: 0022-3654. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The energetics of binding of F- and Cl- to some compds. capable of binding anions at >1 site were detd. and compared to that of similar compds. with only 1 possible binding site. The data obtained show a definite increase in stability of adducts produced by anion attachment to (CHF2)2O, (CHF2)2CO and FCO(CF2)3COF, compared with those of CHF2OCF3, CHF2COCF3, and F(CF2)nCOF, resp. Thus, chelation of halide ions in the former, multiple-binding-site compds. 2699-79-8 and 678-78-4 are just another two chemicals used in this study. is occurring. The chelation effect is more pronounced for Cl- than for F-, a consequence of the largely electrostatic nature of Cl- binding compared to covalent binding in F- adducts. .