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Oligomerization of perfluoropropylene catalyzed by π-bis-(arene)chromium(0) gave two dimers(ⅡA and ⅡB), two trimers(ⅢA and ⅢB) and two defluorotrimers(ⅣA and ⅣB). The last were found to arise from hydrogenation of ⅢB followed by dehydrofluorination. Hydrogen fluoride evolved was added to perfluoropropylene to give 2-hydroheptafluoropropane. By using labeling technique, hydrogen was found to arise from ligand presumably through π-σ rearrangement, A possible mechanism was proposed, π-Bis(benzene)chromium(0) was able to catalyze the polymerization of perfluorobut-2-yne to form its polymer, a white powder. The same catalyst could catalyze copolymerization of CF_3CCCF_3 and CF3CFCF_2 to give solid copolymer. Three perfluoro-2-alkynenitriles (CF_3CC-CN,C_2F_5CC-CN, n-C_3F_7CC-CN) were successfully synthesized by intramolecular Wittig reaction and one of them, i.e, C_2F_5C CCN was polymerized catalytically by π-bis(benzene)chromium(0) to give its polymer. a black powder.
Oligomerization of perfluoropropylene catalyzed by π-bis- (arene) chromium (0) gave two dimers (ⅡA and ⅡB), two trimers (ⅢA and ⅢB) and two defluorotrimers (ⅣA and ⅣB). The last were found to arise from hydrogenation of IIIB followed by dehydrofluorination. Hydrogen fluoride fluoride evolved was added to perfluoropropylene to give 2-hydroheptafluoropropane. By using labeling technique, hydrogen was found to arise from ligand presumably through π-σ rearrangement, A possible mechanism was proposed, π-Bis (benzene) chromium (0) was able to catalyze the polymerization of perfluorobut-2-yne to form its polymer, a white powder. The same catalyst could catalyze copolymerization of CF_3CCCF_3 and CF3CFCF_2 to give a solid copolymer. Three perfluoro-2-alkynenitriles (CF_3CC- C_2F_5CC-CN, n-C_3F_7CC-CN) were successfully synthesized by intramolecular Wittig reaction and one of them, ie, C_2F_5C CCN was polymerized fedtically by π-bis benzene (0) to give its polymer.