References
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- Gassman , P. G. 1970 . Acc. Chem. Res. , 3 : 26 R. Huisgen, H. Stangl, H. J. Sturm, R. Raab and K. Bunge, Chem. Ber. 105, 1258, 1279, 1307 (1972)
- Reetz , M. T. and Maier , W. F. 1977 . unpublished results W. F. Maier, Diplomarbeit, Univ. Marburg 1975; E. U. Würthwe in (private communication) comes to similar conclusions using more refined methods. Amino-substituted derivates appear to prefer the 2-aza-allyl geometry
- Burchill , P. J. , Brownstein , S. and Eastham , A. M. 1967 . Can. J. Chem. , 45 : 17