References
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- For other methods see ref. 3–9 and references cited therein.
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- Klein , R. F. X. , Bargas , L. M. , Horak , V. and Navarro , M. 1988 . Tetrahedron Lett , 29 : 851
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- The use of 1N hydrochloric acid was found to be equally effective.
- We are grateful to the Natural Science and Engineering Research Council of Canada and the University of Alberta for financial support. J. M. N. wished to thank the National Council for Scientific Research. Zambia for granting the study leave.