Sodium orthohydroxymandelate/phenol/water complex, preparation process and use for isolation of sodium orthohydroxymandelate
US5750775A · kind A · utility
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Key dates
| Filing date | Sep 18, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Sep 18, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C59/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A crystallized sodium orthohydroxymandelate-phenol-water complex, its preparation process in which phenol (P.sub.2) is introduced into an aqueous solution S at a pH comprised between 7 and 9.5 in order to obtain the expected product which is crystallized, the aqueous solution S being such as that resulting from the reaction of phenol (P.sub.1) with glyoxylic acid in the presence of a tertiary amine and of a trivalent cation, then treatment using a solution of an alkaline hydroxide, use of this complex for the preparation of sodium orthohydroxymandelate (NaOHM), preparation process for the latter from the starting complex.
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