3171
Acknowledgements
The Institute for Advanced Studies in Basic Sciences (IASBS) is thanked for supporting this work.
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15. Procedure for the preparation of 1-hydroxyphosphonates (1): Magnesium oxide (2 g) was added to a stirred mixture
of diethyl phosphite (0.02 mol) and aldehyde (0.02 mol) at room temperature. After 2 h the mixture was washed by
dichloromethane (4×50 mL) and dried with CaCl2; evaporation of the solvent gave the crude product. The products were
crystallized from CH2Cl2:n-hexane (1:2) or distillated under reduced pressure.
16. All products gave satisfactory spectral data in accord with the assigned structures and literature reports8 (e.g., for 2a δH
(CDCl3, TMS): 1.15–1.30 (2t, 6H, J=6 Hz, 2-OCH2CH3), 4.05–4.7 (2q, 4H, J=6 Hz, 2-OCH2CH3), 7.13–8.1 (m, 5H); IR
(neat): ν 1659 (C_O), 1610 (Ar), 1258 (P_O), 1103–1025, 978 (P–O–Et) cm−1].