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The addition of the alkyllithium reagent to the imine generates a new stereocenter in the resulting compounds 1-4 and 6. Of course both enantiomers are formed in a 1:1 ratio, but what is the configuration in the crystal structures of compounds 1-4 and 6? Furthermore, the addition of sec-Buli generates two adjacent stereocenters in compound 2. What are their configurations/stereochemical relation in the crystal structure? These stereochemical aspects should be addressed in the text.

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