232 PRACTICAL ORGANIC CHEMISTRY undergoes hydrolysis giving benzyl alcohol and the alkali salt of benzole acid. The final result is equivalent to the reduction of one molecule of benzaldehyde C 8 H 5 CHO + OHCC 6 H 6 = C 6 H 5 COOCH 1 C 6 H 6 C 6 H 6 COOCH 2 C 6 H 6 + KOH = C 8 H 6 CH 2 OH + C 8 H 6 COOK to the corresponding alcohol, and oxidation of the second molecule to the corres-ponding acid. The two products can be readily separated by treatment with water, in which the potassium benzoate dissolves, whilst the benzyl alcohol separates as an insoluble oil which can be removed by extraction with ether: acidification of the residual aqueous solution by concentrated hydrochloric acid then precipitates the benzoic acid. This reaction is given by most aromatic aldehydes having the aldehyde group directly joined to the benzene ring: it is also given by formaldehyde, with the formation of methanol and formic acid. Other aliphatic aldehydes do not give Cannizzaro's reaction under these conditions. Required:
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.