1. F. Ramirez, C. P. Smith, J. F. Pilot, and A. S. Gulati, J. Org. Chem.,33, No. 10, 3787 (1968).
2. J. B. Hynes, R. C. Price, W. S. Brey, et al., Can. J. Chem.,45, No. 19, 2278 (1967).
3. J. Burgess, J. G. Chambers, D. A. Clarke, and R. D. W. Kemmitt, J. Chem. Soc., Dalton Trans., No. 19, 1906 (1977).
4. N. P. Gambaryan, Chemical Sciences Doctoral Dissertation, Institute of Heteroorganic Compounds, Academy of Sciences of the USSR, Moscow (1965).
5. R. K. Mackie, in: J. I. G. Cadogan (ed.), Organophosphorus Reagents in Organic Synthesis, Academic Press, London (1979), p. 446.