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Acetate. -Besides the catalyst, reaction temperature and solvent are also optimized and a probable mechanism is discussed. The process presented in the scheme is operationally simple, environmentally benign and the catalyst can be reused for at least three reaction cycles without loss of activity. -(WANG*, L.-M.; WANG, Y.-H.; TIAN, H.; YAO, Y.-F.; SHAO, J.-H.; LIU, B.; J.

An efficient deuterium labelling of theaflavin, aiming at radiolabelling of theaflavin, was accomplished for the first time by using 4-deuterium-labelled epi-catechin as the precursor and the resulting D-labelled theaflavin was fully characterized by 1 H NMR, 13 C NMR, IR spectroscopy and ESI-MS. The synthesis features a novel efficient polyphenol oxidase (PPO) catalyzed benzotropolone formation. PPO was bound onto a selected polymer by a novel efficient method developed in this lab.