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Considerably improved yields are obtained in the title reaction if the reaction is performed in an external magnetic field (1 T).

Various Aldehydes. -The addition of bis(trimethylsilyl)phosphite, generated in situ by the reaction of diethyl phosphite with bromotrimethylsilane, to two groups of imines is performed, the chiral Schiff bases (I) and imines (III). The diastereoselectivity of the formation of phosphonic acids (II) varies from 9 up to 82% diastereoisomeric excess. In the case of imines (III) the diastereoselectivity varies from 14 to 100% diastereomeric excess in the case of ferrocene derivative (IVc). Interestingly, the separation of predominant diastereoisomers of aminophosphonic acids (IIa), (IIc), (IId), and (IIe), as well as (IVa), which easily crystallize from the postreaction mixture, is observed. -(LEWKOWSKI*, J.; KARPOWICZ, R.; Heteroat. Chem. 21 (2010) 5, 326-331,