Sorry for the error in logic. Doubly enriched 13C TFA would only have
a relative abundance of 10^-4. We would be happy to achieve single
enrichment TFA, F.W. 115. That would give 50% enrichment in the 2
position but a 50X improvement in signal intensity in carbon/fluorine
HSQC. Any helpful comments and ideas would be greatly appreciated.
Paul J. Franklin(moderator - sci.chem.organic.synthesis) [Only registered users see links. ]
Georgia State University <[Only registered users see links. ].edu>