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]. .

Octafluoroisobutylene epoxide derivatives

Octafluoroisobutylene epoxide derivatives. 62884-06-4 is also in the experiment. Hill, J. T. (Elastomer Chem. Dep., E. I. du Pont de Nemours and Co., Inc., Wilmington, Del., USA). J. Fluorine Chem., 9(2), 97-112 (English) 1977. CODEN: JFLCAR. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) Section cross-reference(s): 23, 27 Octafluoroisobutylene epoxide (I) [707-13-1] reacts with alkoxides in a manner similar to hexafluoropropylene (II) [428-59-1], but no difunctional polymers of I with mol. wt. as high as those obtained with II could be made. Unsatd. ether derivs. from I dimer derivs. and from K pentafluorophenoxide [4615-85-4]-I reaction products were incorporated into fluoropolymers. Perfluoro(2-phenoxypropane) (III) [62884-12-2] gives a crosslinking site for the nucleophilic vulcanization of elastomeric perfluoro(methyl vinyl ether)-III-tetrafluoroethylene copolymer [63069-20-5]. .