... found that the irradiation of 9b (0.013 M) in pyridine-CH$l2 (1 : 7 vol ratio) in the presence of 0.5 ... We found that we could reduce the amount of pyridine to one-eighth volume in CH2Cl2 without any decrease in the ... Oh, SH.: Tamura, K.; Sato, T. Tetrahedron, 1992,48,%87-9694. ...