References
- Sasaki , T. , Kanematsu , K. and Hayakawa , K. J. Amer. Chem. Soc , Part VI of this series, submitted to
- Battiste , M. A. and Barton , T. J. 1967 . Tetrahedron Letters , : 1227
- Steigel , A. , Sauer , J. , Kleir , D. A. and Binsch , G. 1972 . J. Amer. Chem. Soc. , 94 : 2772
- Hamer , J. , ed. 1967 . l,4-Cycloaddition Reactions New York, N. Y. : Academic Press . The subject has been reviewed in, 182
- Paquette , L. A. and Leichtes , L. M. 1970 . J. Amer. Chem. Soc. , 92 : 1765
- Evnin , A. B. , Arnold , D. R. , Karnischky , L. A. and Strom , E. 1970 . J. Amer. Chem. Soc. , 92 : 6218
- Overberger , C. G. , Anselme , J. P. and Hall , J. R. 1963 . J. Amer. Chem. Soc. , 85 : 2752 ref.(2a)
- The anisotropy of the azo linkage has been remarked upon, see ref. (5) and cited therein
- Sasaki , T. 1970 . J. Amer. Chem. Sco. , 92 : 3192 Analogical chemical shifts of gem-dimethyl protons in the medium-membered heterocycles have shown, see et. al
- Maier , G. and Heep , U. 1968 . Chem. Ber. , 101 : 1371 Similarly, the reaction of 2,5-diphenyl-3,4-diazanorcaradiene with dimethyl acetylenedicarboxylate gave a 1:2 adduct arising from dipolar attack at the C[dbnd]N bond, see