A) ethyl butyrate
B) acetoacetic ester
C) methyl acetoacetate
D) ethyl propionate
Correct Answer: B
Solution :
On condensation of two moles of ethyl acetate in presence of sodium ethoxide, gives ethyl acetoacetate (ester). This condensation is an example of Claisen condensation because it is possible in those ester which have a-hydrogen atom. \[C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,--C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\] \[\xrightarrow[{}]{NaO{{C}_{2}}{{H}_{5}}}\underset{ethyl\text{ }acetacetate\text{ }(ester)}{\mathop{C{{H}_{3}}\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}}}\,+{{C}_{2}}{{H}_{5}}OH\]
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