Polyfluoroheterocyclic compounds. Part XVIII. Reactions of heptafluoro-quinoline and -isoquinoline and pentafluoropyridine with hydrogen halides
作者:R. D. Chambers、M. Hole、W. K. R. Musgrave、J. G. Thorpe
DOI:10.1039/j39710000061
日期:——
When pentafluoropyridine and heptafluoro-quinoline and -isoquinoline react with hydrogen halides in tetrahydro-thiophen dioxide, replacement of fluorine ortho and para to ring nitrogen by the other halogen occurs. The order of reactivity is heptafluoroquinoline ⋙ heptafluoroisoquinoline > pentafluoropyridine. Reaction with heptafluoro-quinoline occurs at room temperature with substitution first at
Chromium oxide is a good catalyst for scrambling halogens among polyhaloaromatic compounds. Chloropentafluorobenzene and bromopentafluorobenzene disproportionate to hexafluorobenzene and the respective tetrafluorodihalobenzenes. Pentachloro- and pentafluoropyridines produce pyridines with intermediate numbers of both types of halogens. Cyano, trifluoromethyl and a single hydrogen can be present on the aromatic rings without interfering with the chemistry.
Musgrave, W. K. R., Chemistry and industry
作者:Musgrave, W. K. R.
DOI:——
日期:——
BANKS R. E.; BARLOW M. G.; MAMACHANI M., J. FLUOR. CHEM., 1981, 17, NO 2, 197-203