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A process for producing an epoxide derivative, comprising reacting an alcohol of formula (I) with an epoxide of formula (II) in the presence of a simple metal salt of rare earth element as a catalyst, in formula (I)-(II), R1 represents the skeleton moiety of the alcohol, R2 represents a linear or branched alkyl group, p is an integer ranging from 1 to 100, and q is 0 or 1. A process for preparing a sulfation product of the epoxide derivative is also provided.