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Cover Picture: Atropisomerism in a Belt‐Persistent Nanohoop Molecule: Rotational Restriction Forced by Macrocyclic Ring Strain (Chem. Asian J. 7/2012)
Author(s) -
Hitosugi Shunpei,
Nakanishi Waka,
Isobe Hiroyuki
Publication year - 2012
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201290025
Subject(s) - atropisomer , ring (chemistry) , axial chirality , strain (injury) , chemistry , aryl , steric effects , stereochemistry , molecule , cover (algebra) , engineering , organic chemistry , anatomy , biology , mechanical engineering , alkyl , enantioselective synthesis , catalysis
Biaryl Atropisomerism has been an important notion in chemistry since its discovery in 1922 and the conceptual foundation in 1933, and introduction of steric constraints at the ortho ‐positions of aryl units has been regarded as a requisite condition for the emergence of the atropisomerism. Hiroyuki Isobe et al. disclose in their Communication on page 1550 ff ., that this is not always the case. In their belt‐persistent nanohoop molecules, atropisomerism arising from macrocyclic ring strain has been observed.