Process for preparing ester compounds
AssigneeDaihachi Chemical Industry Co., Ltd.
InventorsNoriaki Tokuyasu, Shin Nakamura
Life of this patent
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Abstract
A process for preparing an ester compound comprising reacting a halogen-substituted aliphatic hydroxy compound or aromatic hydroxy compound with a phosphorus oxyhalide or phosphorus pentahalide in the presence of 0.005 to 10 mol % of a phosphorus trihalide with respect to the hydroxy compound to obtain a phosphoric ester compound. Phosphoric ester compounds of high purity containing less coloring components can be prepared without using an antioxidant.
Claims17
A process for preparing an ester compound comprising adding phosphorus trihalide to a mixture of at least one of a halogen-substituted aliphatic hydroxy compound, an aromatic hydroxy compound which may be substituted by substituents other than an alkyl group, and an aromatic dihydroxy compound selected from the group consisting of hydroguinone, resorcinol, bisphenol A, bisphenol S and (2,2′-, 3,3′- and 4,4′-biphenyldiol or a mixture thereof, with a phosphorus oxyhalide or phosphorus pentahalide, wherein the phosphorus trihalide is added in the amount of 0.005 to 10 mol % of the hydroxy compound to obtain a phosphoric ester compound represented by the general formula (I):
- wherein R1, R2, R3 and R4 are, the same or different, an alkyl group of 1 to 10 carbon atoms substituted by a halogen atom, or an aryl group of 6 to 12 carbon atoms which may be substituted by substituents other than an alkyl group, X is a bivalent residue corresponding to hydroquinone, resorcinol, bisphenol A, bisphenol S or (2,2′-, 3,3′- or 4,4′-)biphenyldiol, and y is an integer from 0 to 10.
A process for preparing an ester compound comprising adding phosphorus oxyhalide or phosphorus pentahalide to a mixture of at least one of a halogen-substituted aliphatic hydroxy compound, an aromatic hydroxy compound which may be substituted by substituents other than an alkyl group, and an aromatic dihydroxy compound selected from the group consisting of hydroquinone, resorcinol, bisphenol A, bisphenol S and (2,2′-, 3,3′- and 4,4′-)biphenyldiol or a mixture thereof, with a phosphorus trihalide, wherein the phosphorus trihalide is in the amount of 0.005 to 10 mol % of the hydroxy compound to obtain a phosphoric ester compound represented by the general formula (I):
- wherein R1, R2, R3 and R4 are, the same or different, an alkyl group of 1 to 10 carbon atoms substituted by a halogen atom, or an aryl group of 6 to 12 carbon atoms which may be substituted by substituents other than an alkyl group, X is a bivalent residue corresponding to hydroquinone, resorcinol, bisphenol A, bisphenol S or (2,2′-, 3,3′- or 4,4′-)biphenyldiol, and y is an integer from 0 to 10.
Dependencies are inferred from the claim text.