Abstract

Conformational control of a cyclophane with intermolecular hydrogen bonding was accomplished through the first synthesis of a carbamoyloxa-bridged cyclophane 3, with the result that the crystal structures of two isolable conformers 3a and 3b were elucidated to be anti-(E,E) and anti-(Z,Z) by X-ray analysis. The convenient conversion of 3a to 3b was carried out with hydrogen bonding assisted by polar solvents

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