stirred for 2 h at the same temperature and transferred into a centrifuge vial through a double ended needle 18 gauge centrifugation results in the separation of the enolborinate solution from the solid et 3 n hi in representative cases this solid was collected and weighed essentially quantitative yields are obtained the enolborinate solution is then transferred into an nmr tube by a double ended needle the 1 h nmr olefinic proton analysis gives the extent of enolization and the 11 b nmr spectrum borinate region usually broad 50 56 ppm confirms the formation of enolborinates in representative cases the enolborinates were treated with benzaldehyde and the enolates proved to be highly reactive even at 78 u00b0 c chx 2 bi is easy to prepare and very stable even at room temperature under an inert atmosphere no cleavage of ester has been observed the reaction is essentially instantaneous even at 0 u00b0 c in all cases except for the sterically hindered tert butyl propionate visual observation of the formation of et 3 n hi as a pale yellow precipitate as the enolization progresses is an added advantage for this reagent providing a convenient guide to the course of the reaction chx 2 bi thus has proved to be a valuable practical reagent for the enolization of ester and teriary amides and has achieved for the first time the facile enolization of.