Axial bonds drawing

Draw the axial bonds before the equatorial ones alternating their direction on adjacent atoms Always start by placing an axial bond up on the uppermost carbon or down on the lowest carbon... 

Atorvastatin, structure of, 105. 516 ATP (see Adenosine triphosphate) ATZ, see Anilinothiazolinone, 1031-1032 Aufbau principle. 6 Axial bonds (cyclohexane), 119 drawing, 120 Azide, amines from, 929 reduction of, 929 Azide synthesis, 929 Azo compound, 944 synthesis of, 944-945 uses of. 945... 

The axial bonds are relatively easy to draw in. They should all be vertically aligned and alternate up and down all round the ring. 

Draw axial and equatorial bonds. On a down C the axial bond is down. 

STEP 4 Draw the six axial bonds, as vertical lines. Remember that all axial bonds are parallel to each other. Sets of parallel axial bonds are shown in color. 

Step 3 Draw the axial bonds as vertical lines that are in the direction of the larger angle at each ring atom. 

Having drawn the carbon skeleton, we next add the axial and equatorial bonds. It is easy to draw the axial bonds. B inning at C-1 go around the ring with alternating up and down hnes. Up bonds are at C-1, C-3, and C-5 down bonds are at C-2-, C-4, and C-6. 

The conformational features of six membered rings are fundamental to organic chemistry so it is essential that you have a clear understanding of the directional prop erties of axial and equatorial bonds and be able to represent them accurately Figure 3 17 offers some guidance on the drawing of chair cyclohexane rings... 

Figure 4.10 A procedure for drawing axial and equatorial bonds in chair cyclohexane.

We saw early in Section 3.3.2 that, if we draw cyclohexane in typical two-dimensional form, the bonds to the ring could be described as up or down , according to whether they are wedged or dotted. This is how we would see the molecule if we viewed it from the top. When we look at the molecule from the side, we now see the chair conformation the ring is not planar as the two-dimensional form suggests. Bonds still maintain their up and down relationship, but this means bonds shown as up alternate axial-equatorial around the ring they are... 

Exercise 20-4 Draw the chair conformation of /3-D-glucose with all of the substituent groups axial. Explain how hydrogen bonding may complicate the usual considerations of steric hindrance in assessing the stability of this conformation relative to the form with all substituent groups equatorial. 

First write a chair conformation of cyclohexane, then add two methyl groups at C-1, and draw in the axial and equatorial bonds at C-3 and C-4. Next, add methyl groups to C-3 and C-4 so that they are cis to each other. There are two different ways that this can be accomplished either the C-3 and C-4 methyl groups are both up or they are both down. 

Draw the chair conformation of cyclohexane and show clearly the distinction between axial and equatorial bonds. 

Orient your model so that you look at an edge of the ring and it conforms to Fig. 27.3. Are the two axial positions labeled A cis or trans to each other (5a) Are the two equatorial positions labeled B cis or trans to each other (5b) Are the axial and equatorial positions A and B cis or trans to each other (5c) Rotate the ring and view new pairs of carbons in the same way. See whether the relationships of positions vary from the above. Position your eye as in Fig. 27.3 and view along the carbon-carbon bond. In the space provided on the Report Sheet (5d), draw the Newman projection. Using this projection, review your answers to 5a, 5b, and 5c. 

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