Marcin Kwit et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 13(31), 8688-8695 (2007-07-31)
Aliphatic dialdehydes of rigid structures having a cyclohexane, a bicyclo[2.2.2]octane or a triangulane skeleton, have been condensed with enantiomerically pure trans-1,2-diaminocyclohexane to give [3+3] or [2+2] macrocyclization products. Unlike acyclic aliphatic imines, these macrocyclic oligoimines show enhanced stabilities and their...
Jana Hodacová et al.
Organic letters, 9(26), 5641-5643 (2007-11-22)
2,2'-Bipyridine-5,5'-dicarbaldehyde has been prepared in two steps by enamination of 5,5'-dimethyl-2,2'-bipyridine with Bredereck's reagent, and subsequent oxidative cleavage of the enamine groups with sodium periodate. On condensation of this dialdehyde with enantiomerically pure trans-1,2-diaminocyclohexane, the macrocyclic [3+3] hexa Schiff base...
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