This organic chemistry video tutorial focuses on the chair conformation of cyclohexane. it shows how to draw the most stable conformation. it contains a few notes, examples, and practice problems. This video discusses the relative stability of the chair conformations of cyclohexane such as the chair conformation, twist boat conformation, boat conformation, and the half chair conformation.. Chair-chair interconversion like other conformations we have studied, chair conformations are in a state of constant flux. because all the c-c bonds are interconnected, they cannot rotate independently but have to move together. for example, one end of the chair could "flip up" to put the cyclohexane ring in a boat conformation..
To gain more stability, cyclohexane adopts the chair conformation instead. the chair conformation is a six-membered ring in which atoms 2, 3, 5, and 6 lie in the same plane, atom 1 lies above the plane, and atom 4 lies below the plane. we will examine how to draw and number the structure later. with this conformation, the bond angles are 110.9. Another conformation which is important in any conformational analysis is the transition state, or maximum energy conformation on the rotational path.for cyclohexane this is the so-called "half-chair conformation", in which now 5 carbons are co-planar, and only one is puckered out of the plane.. The most stable conformation of cyclohexane is the chair form shown to the right. the c-c-c bonds are very close to 109.5 o, so it is almost free of angle strain.it is also a fully staggered conformation and so is free of torsional strain..
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