Page 1. Tetrahedron. 1%5, Vol. 21. pp. 1701 CO 1709. Pcrgrmon Prcar Ltd. Printed in Norlhcm ... 4 DE Applequist and ND Werner, J. Org. Chem. 28,48 (1963). s HM Walborsky, L. Barash and TC Davis, Tetrahedron 19, 2333 (1963). 4 GA Haggis and LN Owen, J. Chem. Sex. ...