反应详情

To a cold (5° C.) solution of 3 moles of diethanolamine in tetrahydrofuran was added dropwise a solution of 3,5-di-t-butyl-4-hydroxybenzoyl chloride in benzene. The reaction mixture was stirred for about 1 hour, washed with water, separating the benzene layer from the aqueous layer. The benzene solution was evaporated to yieldan oil, which, after crystallization with aqueous ethanol, yielded a white solid. Small amounts of by-product compounds of Examples 1 and 3 were removed by fractional crystallization to yield N-hydroxyethyl-N-(3',5'-di-t-butyl-4'-hydroxybenzoyloxyethyl)-3,5-di-t-butyl-4-hydroxybenzamide; melting point 174°-178° C. When testedby the procedure of Example 2, the sample containing this compound lasted 1,200 hours, about 2.2 times as long as the control.

1. washwashed with water
2. customseparating the benzene layer from the aqueous layer
3. customThe benzene solution was evaporated
4. customafter crystallization with aqueous ethanol
5. customyielded a white solid
6. customSmall amounts of by-product compounds of Examples 1 and 3 were removed by fractional crystallization