engleski

Chelating P2-Bis-phosphazenes with a (R, R)-1, 2- Diaminocyclohexane Skeleton : Two New Chiral Superbases

The linkage of two P2-phosphazenyl groups through a C2-symmetric (R, R)-1, 2-diaminocyclohexane (DACH) backbone yielded the new chiral superbases DACHP2NMe2 and DACH-P2Pyr (Pyr=pyrrolidinyl). These bases were prepared by a Kirsanov reaction and studied with respect to their spectroscopic and structural characteristics. Theoretical calculations concerning their basicity properties revealed remarkable pKBH + values of 38.1 and 39.9 on the acetonitrile scale ; this makes them the strongest nonionic chiral superbases known to date.

basicity ; chirality ; density functional calculations ; phosphazenes ; superbases

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