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In the case of a primary amine the carbinolamine can also dehydrate with formation of an imine, which is an inhibiting species on the catalyst surface. The acetone excess used, makes that the imine corresponding with acetone is the only one which is formed whereas the formation of the one corresponding with 4-nitrobenzaldehyde is suppressed . In case of a secondary amine the formation of any imine is prevented due to the lack of a second hydrogen on the nitrogen

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