When R2 sé H, the yields are obviously improved when catalysts such as copper (I) bromide and triethylamine are used. All the structures of these products have been confirmed by spectroscopic determinations. These ketoester acids 1 are slightly soluble in water and sometimes they decompose to a small extent during distillation. Thus, as the NMR spectra of the crude products are correct. they were used as such for further reactions. The ...
