References
- Gibson , M. S. and Bradshaw , R. W. 1968 . Angew. Chem. Int. Ed. Engl. , 7 : 919 and references therein
- Sheenan , J. C. and Bohlofer , W. A. 1950 . J. Am. Chem. Soc. , 72 : 2786
- Landini , D. and Rolla , F. 1976 . Synthesis , : 389
- Nefkens , G. H. L. 1960 . Nature , 185 : 309
- Nefkens , G. H. L. , Tesser , G. I. and Nivard , R. J. F. 1960 . Rec. Trav. Chim. Pays Bas , 79 : 688 C. A. 55, 1461h (1961)
- Worster , P. M. , Leznoff , C. C. and McArthur , C. R. 1980 . J. Org. Chem. , 45 : 174 A very recent paper reports similar difficulties and describes a new preparation of (3a); see
- Reuschling , D. , Pietsch , H. and Linkies , A. 1978 . Tetrahedron Lett. , : 615
- 1972–73 . Handbook of Chemistry and Physics , 53rd Edn. , Cleveland, Ohio : The Chemical Rubber Co. .