responding to the exchange of half the hydrogen atoms, i.e., to cycloheptane C 7HTDT. This may be evidence of a planar arrangement of the molecule on the ...
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www.springerlink.com/index/J7K675215077732X.pdf
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being 0.977 and --0.893 A. Ring F is planar. The cycloheptane ring G (the atoms C(1), C(5),. C(6), C(7), C(8), C(9), and C(10)) is a S'6C9 chair, ...
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www.springerlink.com/index/M8469H238739W255.pdf
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The oxobutyl group forms a planar extended configuration giving a dihedral angle of 48.3 (1)° with the mean plane passing through the cycloheptane ring. ...
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scripts.iucr.org/cgi-bin/paper?sk1261
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Cyclopropane is necessarily planar (flat), with the carbon atoms at the corners of an equilateral triangle. The 60º bond angles are much smaller than ... Cycloheptane and cyclooctane have greater strain than cyclohexane, in large part due to transannular crowding (steric hindrance by groups on opposite sides of the ring).
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www.cem.msu.edu/~reusch/VirtualText/sterism2.htm
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and the terms pseudo-axial and pseudo-equatorial in the context of the non-planar structures of cyclopentane and cycloheptane. (See apical, basal, equatorial for an alternative use of axial and equatorial with bipyramidal structures...
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www.chem.qmul.ac.uk/iupac/stereo/A.html
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For cycloheptane, most simply desorbs but about 30% is dehydrogenated; interestingly, ... Between 325 and 375 K, all of the cyclic C7 hydrocarbons dehydrogenate further and eventually yield a planar η7-cycloheptatrienyl (C7H7) species on the surface, although for cycloheptene this conversion is inefficient.
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pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/1999/103/i32/a...
pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/1999/103/i32/abs/jp990501a.html
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Hence cyclobutane and cyclopentane, because of rapid conformational change, are assigned symmetry numbers as if they were planar (8 and 10). But cyclohexane and cycloheptane are assigned values of 6 and 1, reflecting the symmetry of the conformer presumed to be most stable.
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webbook.nist.gov/chemistry/grp-add/S-and-P.html
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The larger the angle deviation, larger the strain and hence greater is the reactivity of the molecule. Assuming all cycloalkanes to be planar, the angle strain in various cycloalkanes are, ... Cycloalkane: cyclopropane Cyclobutane Cyclopentane Cyclohexane Cycloheptane...
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www.tutorvista.com/content/chemistry/chemistry-iii/hydr...
www.tutorvista.com/content/chemistry/chemistry-iii/hydrocarbons/alkanes-and-cycloalkanes.php
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The cycloheptane ring adopts a chair conformation. ... The indene ring system is planar, with an r.m.s. deviation of 0.025 Å. The unsubstituted and ...
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scripts.iucr.org/cgi-bin/paper?ci6650
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