应用 Reagent/catalyst for various organic transformations, e.g. allylation of aldehydes, ketones, and quinones; Diels-Alder reaction; the aldol reaction; Michael additions; the reductive Friedel-Crafts; Application Reagent/catalyst for various organic transformations, e.g. allylation of aldehydes, ketones, and quinones; Diels-Alder reaction; the aldol reaction; Michael additions; the reductive Friedel-Crafts;