polar solvents the ratio of O vs. C alkylation products of ethyl 4,4,4-trifluoroacetoacetate (ETFAA)can be dependent on reaction time; in hexamethylphosphorictriamide (HMPA) or acetone, the SN2 cleavage of enol ethers of ETFAA with sodium iodide was observed with concomitant formation of the sodium enolate and the corresponding iodides, and in the case of an activated iodide the mono- and di-alkylation
在非质子极性溶剂中,4,4,4-三氟乙酰乙酸乙酯(ETFAA)的O与C烷基化产物之比取决于反应时间。在六甲基磷酸三酰胺(HMPA)或丙酮中,观察到ETFAA的烯醇醚与碘化钠的S N 2裂解,同时形成了烯醇酸钠和相应的碘化物,在活化碘化物的情况下,单和二碘化物定量得到烷基化产物。
High resolution NMR investigation of enolization of ethyl α-alkylacetoacetates and 3-alkylacetylacetones with branched substituents