Angewandte
Chemie
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[22] The compounds are sensitive and racemize upon column
chromatography with silica gel as the stationary phase. The
Mannich base products should be stored at À358C.
[23] [a]D = + 50 (c = 1.0, MeOH), (literature: [a]D = + 49.5 (c = 0.8,
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references therein.
Angew. Chem. Int. Ed. 2004, 43, 6528 –6531
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