References
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- 34 This work was presented as part of an invited lecture by one of the authors (W. N.) at the 3rd International Congress of Heterocyclic Chemistry held at Sendai, Japan, August 24–28, 1971, Abstract of Invited Lectures
- Nagata , W. , Hirai , S. , Kawata , K. and Aoki , T. 1967 . J. Am. Chem. Soc. , 89 : 5045
- Nagata , W. , Hirai , S. , Kawata , K. and Okumura , T. 1967 . J. Am. Chem. Soc. , 89 : 5046