Tertiary phosphine oxides are prepared by oxidation of tertiary phosphine sulfides using H.sub.2 O.sub.2 in a solvent comprising about 2-20% by weight of optionally halogenated lower aliphatic carboxylic acids and the remainder of mono- or polyhydric aliphatic or cycloaliphatic alcohols--if appropriate in mixtures with other inert solvents which are miscible with the carboxylic acid/alcohol mixture. Preferred solvents comprise acetic acid/methanol and acetic acid/ethanol mixtures. The reaction products are final products and intermediates products in various specialized fields such as, for example, the plant protection sector and the polymers sector.
三级膦氧化物是通过在溶剂中加入2-20%的可选择卤代低级脂肪
羧酸和剩余的单元或多元脂肪或环
脂肪醇(如果适用,可以与其他惰性溶剂混合)使用H.sub.2 O.sub.2氧化三级膦
硫醚制备而成。首选溶剂包括
醋酸/
甲醇和
醋酸/
乙醇混合物。反应产物是各种专业领域中的最终产品和中间产品,例如植物保护领域和聚合物领域。