Other Methods
Why we were doing this chemistry
Known Methodology
Summary of Results

The NMR of some incompletely dried (but distilled) epoxide revealed something rather startling to us - 13C NMR and GC/MS quickly confirmed these peaks to be those of napthalene! (see below)

With further experimentation we were able to drive the raction to completion by employing a 10 fold excess of o-bromofluorobenzene and Mg to furan. Just as the key to identifying the cause of the reduced yields of endoxide lay the detection of the volatile naphthalene, so too did the key to understanding the mechanism lie in the identificaton of the by-products of reaction.