References
- Lansbury , P. T. 1972 . Acc. Chem. Res. , 5 : 311
- Thornberry , N. A. , Bull , H. G. , Taub , D. , Greenlee , W. J. , Patchett , A. A. and Cordes , E. H. 1987 . J. Am. Chem. Soc. , 109 : 7543
- Cousseau Gouin , J. 1977 . J. Chem. Soc. Perkin Trans. , 1 : 1797
- Cousseau , J. 1980 . Synthesis , : 805
- Engman , L. 1987 . Tetrahedron Lett. , 28 : 1463
- Raucher , S. 1977 . Tetrahedron Lett. , : 3909
- Lespieau , R. and Bourguel , M. 1941 . Org. Syn. Coll. , 1 : 180
- Zhu , L. , Wehmeyer , R. M. and Rieke , R. D. 1991 . J. Org. Chem. , 56 : 1445
- Zhu , L. and Rieke , R. D. 1991 . Tetrahedron Lett. , 32 : 2865
- Knochel , P. , Yeh , M. C. P. , Berk , S. C. and Talbert , J. 1988 . J. Org. Chem. , 53 : 2392
- In this experiment, we modified the method (ref. 5) for the preparation of highly reactive zinc by using 5–10 mol% of naphthalene based on lithium as an electron carrier. After the mixture of lithium and naphthalene in THF was stirred for about 5 min, ZnCl2/THF solution was transferred by cannula to it at a rate such that the greenish color persisted until all the lithium was consumed. The activity of the zinc was the same as the method reported earlier.5 The advantages of this method are three fold: using a catalytic amount of naphthalene, shortening the reduction times and ease of product purification