References
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- Marshall , J. A. and Andersen , N. H. 1967 . Tetrahedron Letters , : 1219 J. A. Marshall, N. H. Andersen, and J. W. Schlicher, J. Org. Chem., 35, 858 (1970)
- Brown , J. J. , Lenhard , R. H. and Bernstein , S. 1964 . J. Amer. Chem. Soc. , 86 : 2183 Oxalic acid has been used as a catalyst previously using the normal Dean-Stark method of azeotropic water removal:
- Barton , D. H. R. , Magnus , P. D. , Smith , G. and Zurr , D. 1971 . Chem. Commun. , : 861
- Corey , E. J. , Andersen , N. H. , Carlson , R. M. , Paust , J. , Vedejs , E. , Vlattas , I. and Winter , R. E. K. 1968 . J. Amer. Chem. Soc. , 90 : 3245
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