| 摘要 |
<p>1502052 Preparation of 3,5-ditert-butyl-4- hydroxybenzaldehyde GULF OIL CORP 23 April 1976 [7 May 1975] 16520/76 Heading C2C The invention relates to a method of manufacturing a 3,5-disubstituted 4-hydroxybenzaldehyde of formula in which R and R<SP>1</SP> each represents a methyl or tertiary hydrocarbon substituent having up to 5 carbon atoms, comprising reacting the corresponding 2,6-disubstituted phenol with hexamethylene tetramine or a mixture of formaldehyde and ammonium acetate in aqueous acetic acid. The reaction is preferably carried out at 90‹ to 120‹ C., and the aqueous acetic acid is of from 65 to 85 volume per cent concentration.</p> |
