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document Angle Strain
Angle strain is destabilization due to distortion of a bond angle from its optimum value caused by the electrostatic repulsion of the electrons in the bonds.  Many organic compounds cannot exist with all ideal bond angles, take cyclobutane for instance.  If the ring was...
31 Jan, 2011 Comments: 0
document Heterocyclic Molecules
v\:* { behavior: url(#default#VML) } o\:* { behavior: url(#default#VML) } .shape { behavior: url(#default#VML) } Of course atoms other than C can occur as part of the cyclic structure. Such atoms, which are known as heteroatoms,...
25 Jan, 2012 Comments: 0
document Ring Strain
The destabilization of a cyclic structure compared to a related non-cyclic structure, mainly due to angle (desire to be tetrahedral) and torsional (desire to minimize eclipsed or unfavorable bond interactions) strain. This extra energy is released when the ring is broken.  Ring strain is a...
16 Mar, 2011 Comments: 0
document Steric Strain
A composite of the other strains (angle, torsional, Van der Waals) within a molecule. Steric strain is usually connected with spatial conflicts of atoms or bonds within a molecule.
16 Mar, 2011 Comments: 0
document Multiple Substituents on Cyclohexanes
Substituents on cyclohexane can, in principle, occupy either axial or equatorial positions. However, in general, equatorial substituents are more preferred since they are more stable because of reduced steric interactions. In the images below, the 1,3-diaxial interaction can be highlighted and...
01 Sep, 2011 Comments: 0
document Torsional Angle
Angle between C-X and C-Y bonds in a X-C-C-Y system when viewed along the C-C bond. Rotation about the C-C bond will change this torsional angle.  This is also known as a dihedral angle.
16 Mar, 2011 Comments: 0
document Torsional Strain
Destabilization due to the repulsion between pairs of bonds caused by the electrostatic repulsion of the electrons in the bonds.
16 Mar, 2011 Comments: 0

Department of Chemistry & Chemical Biology