Journal
ORGANIC LETTERS
Volume 14, Issue 1, Pages 276-279Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol203053q
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Axially chiral binaphthyl-azobenzene cyclic dyads in which the two moieties are connected by two linkers of different lengths were synthesized. In the case of benzylated-binaphthyl analogue 2b, photoirradiation resulted in a dramatic change of the CD spectrum and optical rotation. Experimental and theoretical analyses indicated that the dihedral angle of the two naphthalene rings is strongly coupled to the azobenzene photoisomerization; cis-azobenzene induces a transoid-binaphthyl structure, while trans-azobenzene Induces a cisold-binaphthyl structure.
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