Cycloadditions with clays and alumina without solvents

Article abstract of DOI:10.1016/S0040-4039(98)00159-2

The utilization of unactivated K-10 montmorillonite or alumina for Diels-Alder reactions in the absence of solvents, either with symmetrically- or unsymmetrically-substituted carbonyl dienophiles, constitutes an environmentally-friendly alternative providing excellent selectivities under mild conditions.