+++J. Org. Chem., & J. Am. Chem. Soc.

[geizerr]

1. Krystyna Lesiak, Kyoichi A. Watanabe, Jay George, and Krzysztof W. Pankiewicz
2-(4-Nitrophenyl)ethyl Methylenebis(phosphonate): A Versatile Reagent for the Synthesis of Nucleoside 5‘-Methylenebis(phosphonate)s
The Journal of Organic Chemistry, 1998, 63 (6), pp 1906–1909

DOI:

http://dx.doi.org/10.1021/jo971859a

2. Krzysztof W. Pankiewicz, Krystyna Lesiak, and Kyoichi A. Watanabe
Efficient Synthesis of Methylenebis(phosphonate) Analogues of P1,P2-Disubstituted Pyrophosphates of Biological Interest. A Novel Plausible Mechanism
Journal of Americal Chemical Society, 1997, 119 (16), pp 3691–3695

DOI:

http://dx.doi.org/10.1021/ja964058i

[Demcha]

[geizerr]

Demcha, большое спасибо