A Modification of the Knorr Oxidative Coupling Method for Preparation of 1,4-Diketones

Diethyl 2,3-bis(4-methoxybenzoyl)succinate

“…Compound (I) was synthesized as reported previously (Wu et al, 1997). Crystals appropriate for data collection were obtained by slow evaporation of a methanol-ethyl acetate (1:1 v/v) solution of (I).…”

(2R,3S)-Diethyl 2,3-dibenzoylsuccinate

“…The title compound was synthesized according to the literature procedure of Wu et al (1997). Crystals appropriate for data collection were obtained by slow evaporation of a methanol-ethyl acetate (1:1 v/v) solution of (I).…”

(2RS,3SR)-Diethyl 2,3-bis(3,4-dimethoxybenzoyl)succinate

“…Compound (I) was synthesized as reported previously (Wu et al, 1997). Crystals of (I) appropriate for data collection were obtained from a methanol-ethyl acetate solution by slow evaporation.…”