References
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- Zieliński , W. S. , Leśnikowski , Z. and Stec , W. J. 1976 . J. Chem. Soc., Chem. Comm. , : 772
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- Eto , M. 1974 . Organophosphorus Pesticides: Organic and Biological Chemistry , 327 CRC Press Inc. . p.
- Evaporation of the solvent under reduced pressure leaves 2, δ 31P=−39.0 ppm (acetone). In a similar way 4, 6 were isolated; 4: δ 31P=−62.4 ppm (acetone), 6: δ 31p=−88.1 ppm (acetone).
- 31P nmr spectra were recorded on Jeol FX-60 operating at 24.3 MHz. Negative chemical shift was assigned for all compounds absorbing at higher field than H3PO4. 1H nmr spectra were obtained with Perkin -Elmer 60 MHz and fully proved the structures of 3, 5 and 7. Ms spectra were obtained with LKB 2091 Spectrometer.