C Benzoin - Encyclopedia

GEOGRAPHICAL NAMES Spanish Simplified Chinese French German Russian Hindi Arabic Portuguese

C 6 H BENZOIN 5 [[ChohCo. C 6 H]] 5, a ketone-alcohol, which may be prepared by boiling an alcoholic solution of benzaldehyde with potassium cyanide; by reducing benzil (C6H5COCOC6H5) with zinc and acetic acid; or by the oxidation of hydrobenzoin (C 6 H 5. [[ChohChohC 6 H]] 5). It is a colourless, crystalline solid, readily soluble in alcohol and ether, melting at 137° C. and boiling at 343-344°C. On passing the vapour of benzoin over heated lead oxide, it is converted into benzil and benzophenone. Owing to the readiness with which it is oxidized, it acts as a reducing agent, giving a red precipitate of cuprous oxide with Fehling's solution in the cold. Chlorine and nitric acid oxidize it to benzil; chromic acid mixture and potassium permanganate, to benzoic acid and benzaldehyde. On heating with zinc dust, desoxybenzoin (C 6 H 5 COCH 2 C 6 H 5) is obtained; sodium amalgam converts it into hydrobenzoin; and fuming hydriodic acid at 130° C. gives dibenzyl (C 6 H 5 CH 2 CH 2 C 6 H 5). By fusion with alkali it is converted into benzil; and with an alcoholic solution of benzaldehyde in presence of ammonia it forms amarine (triphenyl dihydro-glyoxaline). In the presence of sulphuric acid it condenses with nitriles to oxazoles.

Custom Search

Encyclopedia Alphabetically

A * B * C * D * E * F * G * H * I * J * K * L * M * N * O * P * Q * R * S * T * U * V * W * X * Y * Z

Advertise Here


- Please bookmark this page (add it to your favorites)
- If you wish to link to this page, you can do so by referring to the URL address below.


This page was last modified 29-SEP-18
Copyright © 2021 ITA all rights reserved.