taddol stands for tetraaryl-1,3-dioxolane-4,5-dimethanol. the broad application of titanium taddolate catalysts towards carbonyl additions and cycloadditions has been introduced by seebach and coworkers, and has been thoroughly summarized in a seminal review, in which a working stereoinduction model that agreed with the observed selectivity in a wide variety of reactions was put forth, despite the lack of a clear picture of the mechanism.