1. For a review, see: Lindley, J. Tetrahedron 1984, 40, 1433.
2. Moroz, A. A.; Shvartsberg, M. S. Russ. Chem. Rev. 1974, 43, 679.
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4. Koval, I. V. Russ. Chem. Rev. 1993, 62, 769.
5. Cohen, T.; Cristea, I. J. Am. Chem. Soc. 1976, 98, 748.