Chair Conformation Axial Vs Equatorial
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How do i know which carbon goes up or down learn this and more in video 1 of the chair conformation series.
Chair conformation axial vs equatorial. One set is comprised of c h bonds that extend vertically up and down and are called axial bonds. Hydrogen atoms in axial positions are shown in red while those in equatorial positions are in blue. Why does cyclohexane have to be in a chair conformation. Since there are two equivalent chair conformations of cyclohexane in rapid equilibrium all twelve hydrogens have 50 equatorial and 50 axial character.
In marking thousands of exam papers theres 2 mistakes that ive seen over and over again. A cyclohexane conformation is any of several three dimensional shapes adopted by a cyclohexane molecule. Each position has one axial. Both types are shown here.
In the figure above the equatorial hydrogens are colored blue and the axial hydrogens are black. The equatorial positions are going to face slightly opposite to the axial. Axial substituents are labeled in red below. At each position one substituent is axial loosely perpendicular to the ring and one is equatorial loosely in the plane of the ring.
Equatorial substituents are in blue. There are two general positions that a substituent can be in for a chair conformation of cyclohexane. Equatorial hydrogens are hydrogens that stick out along the equator of the chair. That one is facing up that axial.
Each carbon also has one equatorial. We start with the notion that the conformation of cyclohexane derivatives is based on the chair. Because many compounds feature structurally similar six membered rings the structure and dynamics of cyclohexane are important prototypes of a wide range of compounds. The other set consists of c h bonds that extend out to the periphery of the ring and are called equatorial bonds.
Once youve mastered the art of drawing chair conformations its time to stick some axial and equatorial substituents on those beautiful chairs. Learn how to recognize a chair what it represents with a model kit and on paper and the nature of axial and equatorial substituents. A cyclohexane chair contains two kinds of hydrogens axial hydrogens and equatorial hydrogens. Axial hydrogens are those hydrogens that stick straight up or straight down parallel to an imaginary axis through the chair.
The 2 biggest mistakes in drawing chair conformations. Heres how to avoid those mistakes ace any chair conformations in your ochem exams. There are two distinctive types of c h bonds on the chair. These six hydrogens which point along an axis through the molecule are called axial hydrogens.
A cyclohexane molecule in chair conformation. That means that my equatorial position should face slightly down. Each carbon has one axial.
