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Donor‐Induced Helical Inversion of 1,1′‐Binaphthyl Connecting with Two Molybdenum Complexes
Author(s) -
Ma Li,
Jin Rizhe,
Bian Zheng,
Kang Chuanqing,
Chen Yu,
Xu Jingwei,
Gao Lianxun
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201671
Subject(s) - intramolecular force , chemistry , crystallography , molybdenum , stereochemistry , inversion (geology) , molecule , enantiomer , structural basin , biology , inorganic chemistry , paleontology , organic chemistry
An atropisomeric biaryl molecule with a given absolute configuration could present two opposite helical conformations through the rotation around CC single bond. To the best of our knowledge, the biaryl system is the simplest helical inversion model apart from stereomutation between two enantiomers. Herein, we first report such true helical inversion phenomena of biaryl compounds. Two [Mo VI O 2 (L)]‐type complexes, in which L is a tridentate dioxoanionic pyridine O,N,O‐ligand, are coalesced on the 2,2′,3,3′‐positions of an ( R )‐1,1′‐binaphthyl unit and an intramolecular dioxo bridge is formed by two MoO⋅⋅⋅Mo interactions. Exterior strong donors can coordinate to molybdenum to interrupt this dioxo bridge and inversions from negative to positive chirality are explicitly observed by circular dichroism spectroscopy, consistent with single‐crystal X‐ray diffraction analyses.