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- W2170805210 abstract "Four isomeric products were isolated and purified from the reaction of 1,3-propanediol with the tri-spirane cyclophosphazene-organophosphate compound 1: viz. the di-monospiro (2a), di-monoansa (2b) and two monospiro-monoansa derivatives (2c and 2d). It is shown by 31P NMR spectroscopy on addition of a chiral solvating agent (CSA) that both the di-monospiro 2a and di-monoansa 2b derivatives are racemates, as expected, whereas no splitting of NMR signals occurred on addition of CSA to solutions of 2c and 2d. It is found by X-ray crystallography that the two monospiro-monoansa spirane derivatives, 2c and 2d, are meso diastereoisomers, which represent a new case of the stereochemistry of bis(disubstituted) cyclophosphazene derivatives of 1. It is also observed from the 31P NMR spectrum of the reaction mixture, supported by the yields of pure compounds, that formation of a spiro group is about 4.5 times more likely than that of an ansa moiety under the conditions of the reaction. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)" @default.
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- W2170805210 date "2005-03-01" @default.
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- W2170805210 title "Stereoisomerism in Pentaerythritol‐Bridged Cyclotriphosphazene Tri‐Spiranes: Spiro and Ansa 1,3‐Propanediyldioxy Disubstituted Derivatives" @default.
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- W2170805210 doi "https://doi.org/10.1002/ejic.200400796" @default.
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