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document Conformation of Alkanes and Cycloalkanes
The different spatial arrangements that a molecule can form due to rotation about σ bonds are called conformations and hence conformational isomers or conformers. The study of the energy changes that occur during these rotations is called conformational analysis. This is important...
29 Jan, 2011 Comments: 0
document Conformational Analysis of Cyclohexane
VISIT THE MODELS&# 160;360 SITE AT THE CHEMED DL! (search for cyclohexane to get started, is that model a chair?)   Conformations of cyclohexane provide a much more complex study on how rotation around C-C bonds can lead to structures with differing potential energies. ...
18 Sep, 2012 Comments: 0
document Conformational Analysis of Higher Alkanes
VISIT THE MODELS 0;360 SITE AT THE CHEMED DL! (search for butane to get started, is that model eclipsed, anti, or gauche around the C2-C3 bond?)   In order to fully understand conformations of cyclohexane and greater alkanes, one must be able to analyze and determine the...
26 Aug, 2011 Comments: 0
document Conformational Analysis of Simple Alkanes
Conformational analysis is presented early in your organic chemistry studies to help illustrate the fact that all organic molecules are in constant motion. Most single bonds can and do rotate freely at room temperature. In order to perform conformational analysis on more complicated structures, it...
01 Aug, 2011 Comments: 1
document Cycloalkane Conformations
The term cycloalkane literally means "cyclic alkane" - ring systems formed of only C-C and C-H bonds.  Such structures are commonly encountered in natural compounds such as steroids, with cyclopentanes and cyclohexanes being the most common.   Other than cyclopropane (which must be...
01 Aug, 2011 Comments: 0
document Drawing Cyclohexane Chair Structures
Drawing cyclohexane so that it looks like a chair can be the key to appreciating the axial and equatorial positions. If you are unable to draw good-looking structures that clearly show axial and equatorial positions, then your instructor is probably going to assume that you don't know what you're...
13 Feb, 2013 Comments: 0
document Equatorial Substituents on Cyclohexane Chair Conformations
A bonding position on a chair conformation of cyclohexane in which the bond to the ring is approximately in the average plane of the ring (i.e. around the equator).  Because the equatorial positions have more space, the most stable chair conformation typically places the largest substituents...
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 Axial Substituents and Drawing Cyclohexane
Axial substituents are the positions on a chair conformation of cyclohexane in which the bond to the ring is perpendicular to the average plane of the ring (i.e. pointing up and down towards the poles).  When drawing a cyclohexane ring, start with the chair (including the backrest...
16 Mar, 2011 Comments: 0
document Polycyclic Molecules
Both natural and man-made examples of compounds that contain more than one ring system are known. These can be classified depending on how many rings are present and how the rings are joined together.    If there is a single carbon atom common to two rings, then...
12 Feb, 2012 Comments: 0

Department of Chemistry & Chemical Biology