Process for preparing polyalkyl-2-alkoxy-7-hydroxychroman derivatives.

摘要

Process for preparing polyalkyl-2-alkoxy-7-hydroxychroman derivative of the general formula (V) : <CHEM> wherein R<1> denotes C1-C4 primary alkyl, R<2> denotes hydrogen or C1-C4 primary alkyl and R<3> denotes C1-C4 alkyl, by reacting resorcin with either an aliphatic ketone of the general formula(I) : <CHEM> wherein R<1> and R<2> are as defined above, and an alcohol of the formula(II) : R<3>OH (II) wherein R<3> is as defined above, in the presence of an acid catalyst, or an aliphatic ketone acetal of the general formula(III) : <CHEM> wherein R<1> , R<2> and R<3> are as defined above, in the presence of an acid catalyst.