PROCESS FOR REDUCING ALDEHYDES OR KETONES.

摘要

Damp zirconium hydroxide (I) can be prepd. easily by treating zirconium oxychloride with alkali with (I) being stable toward water, organic cpd(s)., heat, and insoluble in organic solvent(s) so it can be recovered easily from reaction mixt.. Typical reducing procedure involves mixt. of carbonyl cpd(s). (1 mmol.), (I) (0.1-10g, esp. 1-3g) and iso-propanol (0.5-10 ml, esp. 1-3 ml), being refluxed with distilling off by-prod. acetone. Being reaction complete, (I) is filtered off, and filtrate is conc. to yield prod. quantitatively. Redn. can be carried out in vapour-phase also with vaporised mixt. contg. iso-propanol, carbonyl cpd(s). and carrier (air, nitrogen, helium etc.) being fed on (I) to obtain reduced prod.