| 摘要 |
<p>p-Hydroxybenzoic acid can be prepared by reacting an alkali metal salt of phenol (excluding lithium and sodium salts) with carbon dioxide in the presence of at least one compound represented by general formulae (I) or (II) wherein, M represents an alkali metal other than lithium and sodium. In formula (I) R represents a substituent other than an aliphatic hydroxy group containing up to 4 carbon atoms, an aliphatic mercapto group containing up to 4 carbon atoms, a substituent containing at least one of these as a structural unit, and a hydrogen atom. In formula (II) R' represents a substituent other than an aliphatic hydroxy group containing up to 4 carbon atoms, an aliphatic mercapto group containing up to 4 carbon atoms, and a substituent containing at least one of these as a structural unit. In formula (I) n represents an integer of 1 to 5 and the R groups may be the same or different when n is 2 or more. In formula (II) m represents an integer of 1 to 5 and l represents an integer of 0 to 4 provided that the M atoms may be the same or different when m is 1 or more and the R groups may be the same or different when l is 2 or more. The above-described reaction may be conducted using or not using an inert reaction medium.</p> |
