C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/566.7
C07C 47/56 (2006.01) C07C 45/39 (2006.01) C07C 47/565 (2006.01)
Patent
CA 1125788
ABSTRACT OF THE DISCLOSURE The invention relates to sodium paraformylphenolate cry- stallised with two molecules of water, as a novel product. It is manufactured by: a) condensing glyoxylic acid with an excess of phenol in water in the presence of sodium hydroxide at a temperature comprised between 30°C and 100°C ; b) neutralising the solution thus obtained and then freeing it from the unconverted phenol by steam distillation or ex- traction with a water-immiscible organic solvent and then sub- jecting it hot under a pressure of oxygen, to a catalytic decarboxylating oxidising degradation in the presence of sodium hydroxide ; c)allowing the aqueous solution so-obtained,after removal of the catalyst by filtration, and then concentration hot un- der vacuum to 60% plus or minus 10% of its initial volume, to crystallise ; and d) draining the precipitated crystals, washing them and then drying them to constant weight under vacuum of 1 mm of mercury at 20°C, to obtain sodium paraformylphenolate crystal- lised with 2 molecules of water or dried to constant weight under a vacuum of 1 mm of mercury at 100°C to obtain it in arhydrous form. The product is useful for preparing parahy- droxy bepzaldehyde quantitatively and without other purifica- tion reactions.
351172
Christidis Yani
Schouteeten Alain
George H. Riches And Associates
Societe Francaise Hoechst
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