... 11; a T. Hosokawa, S. Aoki, M. Takano, T. Nakahira, Y. Yoshida, S.-I. Murahashi; We have recently reported the effect of HMPA on Pd(II)-catalyzed oxidation of alkenes with O 2 ; see, J. Chem. Soc., Chem. Commun. (1991), p. 1559. b T. Hosokawa, T. Nakahira, M. Takano, S.-I. Murahashi; J. Mol. Catal (1992) in press. ...