R. Singh, Gary V. Eggers, J. Shreeve
May 1, 2003
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Synthesis
Abstract
Reactions of N,N-difluoro-2,2'-bipyridinium bis(tetrafluoroborate) (MEC-31) (1) with fluorinated alcohols R f CH [R f = CF 3 CH 2 , CH 2 FCH 2 , CF 3 CF 2 CH 2 , CHF 2 CF 2 CH 2 . (CF 3 ) 2 CH] 2a-e, in the presence of a base at 70 °Cwithout solvent, gave good yields of 6,6'-di(polyfluoroalkoxyl)-2,2'-bipyridines 3a-e with 100% regioselectivity. Triethylamine with 1, produced 6.6'-difluoro-2,2-bipyridine (4).