REFERENCES
- Doyle , M. , Parker , W. , Gunn , P. A. , Martin , J. and MacNicol , D. D. 1970 . Tetrahedron Lett. , : 3619
- Leonard , N. J. and Coll , J. C. 1970 . J. Am. Chem. Soc. , 92 : 6685
- Coll , J. C. , Crist , D. R. , Barrio , M. d.C.G. and Leonard , N. J. 1972 . 94 : 7092
- Foote , C. S. and Woodward , R. B. 1964 . Tetrahedron , 20 : 687
- Bingham , R. C. and Schleyer , P. v. R. 1971 . J. Org. Chem. , 36 : 1198
- The crystrals of 4 are colorless prisms. The crystal structure consists of two molecules and a single water molecule per asymmetric unit (monoclinic, P21/n). There are some disorders on the two non-amide arms. There is no disorder in the -NH-CO-CH2- arm