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For convenience at the present time racemic auxiliaries are being used that will lead to preferential diastereomeric selectivity
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(a) For convenience at the present time racemic auxiliaries are being used that will lead to preferential diastereomeric selectivity,
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have found evidence for complexation rather than chelation of a metal ion in a 1-hydroxyalkylphosphonate personal communication
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(b) Recently, however, T. A. Modro et al. have found evidence for complexation rather than chelation of a metal ion in a 1-hydroxyalkylphosphonate (personal communication, M. P. Belciug, A. M. Modro, T. A. Modro, P. L. Wessels, J. Phys. Org. Chem., in press).
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(b) Recently, however, T. A. Modro et al. have found evidence for complexation rather than chelation of a metal ion in a 1-hydroxyalkylphosphonate (personal communication, M. P. Belciug, A. M. Modro, T. A. Modro, P. L. Wessels, J. Phys. Org. Chem., in press).
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6444238021
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Although both O-C bond lengths are very similar in 1, Angelova et al. [9b] found that the O-C bond lengths of two sets of diastereotopic ethoxy groups of phosphonates differed by 0.045 and 0.046 Å. These differences should be viewed with caution because of noted thermal disorder in the ethoxy carbons for both structures.
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Dimer formation was also observed in the X-ray crystal structure 2-hydroxyalkylphosphonate by Modro et al. (personal communication) [10].
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