... of water was stirred at O°C while separate solutions Page 4. 38 GESTO, DE LA CUESTA, AND AVENDANO of 54g (0.16 mol) of potassium ferricyanide in 180 a1 of water and 18.6~ (0.33 moll of potassium hydroxide in 80 ml of water were added dropwise at the same rate . ... Chem., 1976, 19, 1138. 3. P ettit , C . R . , Fleming. WC, P aull , KD, J . Org. Chem., 1968, 33. 1089. 4 . Gesto, C. de la Cuesta, E.. Avendaiio, C., Tetrahedron, 1989, ( in press). 5. Foye. WO. ...