| 摘要 |
A monoester compound of a 2,2'-alkylidene bis(4,6-di-substituted phenol) useful as an antioxidant in synthetic polymers having good resistant to oxides of nitrogen fumes, represented by the formula (I), <IMAGE> (I) wherein R1 and R2, which may be the same or different, each represents a C1-4 alkyl group, a C5-6 cycloalkyl group or a methyl-substituted C5-6 cycloalkyl group; and one of R3 and R4 represents a hydrogen atom and the other represents a hydrogen atom or a C1-10 alkyl group or both of them represent a methyl group; R5 represents a C4-9 alkyl group, a C3-7 cycloalkyl group, a C2-4 alkenyl group, a phenyl group, a C1-4 alkyl-substituted phenyl group, a C1-4 alkoxy-substituted phenyl group, a mono- or di- C1-4 alkyl-substituted hydroxyphenyl group, a styryl group, a benzyl group or a pyridyl group, and a method of preparing such a monoester compound.
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