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Describe the following: (a) Crossed Aldol condensation. |
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Answer» Solution :When two aldehydes each containing at least ONE -hydrogen atom are treated with dilute alkali, four different products are obtained of which two are cross-ALDOL condensation products and the other two are self aldol condensation products as shown:`CH_(3) - CH_(2) - CHO + CH_(3) CHO overset("OH")to CH_(3)-CH_(2)-CH_(2)-CHO` PropanalEthanal`underset("3-hydroxypentana"l)(OH)`. (b) SAPONIFICATION: When an ester is hydrolysed in a basic medium it is known as saponification. `CH_(3)underset("Ethyl ACETAT"e)(COOC_(2))H_(5)+NaOHtoCH_(3)underset("sod acetate")(COO^(-))Na^(+)+C_(2)underset(E"thano"l)(H_(5))OH` |
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