... Biochem., 63 (2), 424-426, 1999 Note ll New Synthesis of Optically Active O-Aryl O-Ethyl Phenylphosphonothionates ... indicate that this method would be useful for investigating phosphorus stereoche— mistry and biochemistry. ... O'/P'(*1 {l 'L9 EtO ' / \ , \OEt E“) E10 OEt (1) (2) __U2 ...