References
- Shusherina , N. P. 1974 . Russ. Chem. Rev. , 43 : 851
- Bosshard , P. , Fumagalli , S. , Good , R. , Trueb , W. , Phillips‐born , W. v. and Eugster , C. H. 1964 . Helv. Chim. Acta , 47 : 796 A. Bahl and W. Kemp, J. Chem. Soc., (C) 2268 (1971)
- Composition established by satisfactory CH analysis
- Based on recovered starting material
- IR, NMR, and mass spectra are in accord with the structure
- Horaguchi , T. , Shimiza , T. and Abe , T. 1976 . Bull. Chem. Soc. Japan , 49 : 737
- The hydroxyl hydrogen appears to be statistically disordered between the two positions given for atoms Ha and Ha. The final cycle of refinement gave R1 and R2 both equal to 0.036
- Cain , D. and Smith , T. L. 1980 . J. Am. Chem. Soc. , 102 : 7568 R. C. Larock, B. Riefling, and C. A. Fellows, J. Org. Chem., 43, 131 (1978)
- Eugster , C. H. and Bosshard , P. 1963 . Helv. Chim. Acta , 46 : 815
- It has been reported recently11 that the reaction of ethyl 4‐oxobutynoate with furan gives a Diels‐Alder adduct under neutral conditions and a Michael adduct under acidic ones
- Gorgues , A. , Simon , A. , Le Coq , A. and Corre , F. 1981 . Tetrahedron Lett. , 22 : 625