The conformation of rings A, B, C and D in Cholestanol has to be described. Concept Introduction: The conformation structures of six membered rings are given by chair forms. In the chair conformation, all C-C-C bond angles are 110 .9 0 and the hydrogens on the adjacent carbon atoms are staggered with respect to one another. In the chair conformation, no two atoms are closely present, so, there is a little strain present in chair conformation structure of cyclohexane. The C-H bonds in the chair conformation are arranged in axial and equatorial positions. The bonds that are present parallel to the axis are axial bonds and the bonds that are present perpendicular to the axis are equatorial bonds. In cyclohexane, six hydrogens are axial and six hydrogens are equatorial.
The conformation of rings A, B, C and D in Cholestanol has to be described.
Concept Introduction:
The conformation structures of six membered rings are given by chair forms. In the chair conformation, all C-C-C bond angles are 110.90 and the hydrogens on the adjacent carbon atoms are staggered with respect to one another. In the chair conformation, no two atoms are closely present, so, there is a little strain present in chair conformation structure of cyclohexane. The C-H bonds in the chair conformation are arranged in axial and equatorial positions. The bonds that are present parallel to the axis are axial bonds and the bonds that are present perpendicular to the axis are equatorial bonds. In cyclohexane, six hydrogens are axial and six hydrogens are equatorial.
(b)
Interpretation Introduction
Interpretation:
The hydroxyl group present on Ring A is either axial or equatorial has to be given.
Concept Introduction:
The C-H bonds in the chair conformation are arranged in axial and equatorial positions. The bonds that are present parallel to the axis are axial bonds and the bonds that are present perpendicular to the axis are equatorial bonds. In cyclohexane, six hydrogens are axial and six hydrogens are equatorial.
(c)
Interpretation Introduction
Interpretation:
The methyl group present at the junction of Ring A and Ring B is either axial or equatorial to Ring A and Ring B has to be given.
Concept Introduction:
The C-H bonds in the chair conformation are arranged in axial and equatorial positions. The bonds that are present parallel to the axis are axial bonds and the bonds that are present perpendicular to the axis are equatorial bonds. In cyclohexane, six hydrogens are axial and six hydrogens are equatorial.
(d)
Interpretation Introduction
Interpretation:
The methyl group present at the junction of Ring C and Ring D is either axial or equatorial has to be given.
Concept Introduction:
The C-H bonds in the chair conformation are arranged in axial and equatorial positions. The bonds that are present parallel to the axis are axial bonds and the bonds that are present perpendicular to the axis are equatorial bonds. In cyclohexane, six hydrogens are axial and six hydrogens are equatorial.
Compound A and compound B are different alcohols with the same molecular formula of C4H10O. When reacted with chromic acid (H2CrO4), compound A and compound B produce compound C and compound D, respectively. Compound C has a molecular formula of C4H8O2. Compound E is obtained when compound A reacts with pyridinium chlorochromate (PCC) in a solvent such as dichloromethane (CH2Cl2). Draw the structure of compound A, B, C, D and E.
(a) Draw a skeletal structure of the anabolic steroid methenolone from the following description. Methenolone contains the tetracyclic steroid skeleton with a carbonyl group at C3, a hydroxyl at C17, a double bond between C1 and C2, and methyl groups bonded to C1, C10, and C13. (b) Add wedges and dashed wedges for all stereogenic centers with thefollowing information: the configuration at C10 is R, the configuration at C13 is S, the configuration at C17 is S, and all substituents at ring fusions are trans to each other. (c) Draw the structure of Primobolan, the product formed when methenolone is treated with CH3(CH2)5COCl and pyridine. Primobolan is an anabolic steroid that can be taken orally or by injection and has been used illegally by well-known Major League Baseball players.
Is the methyl group at the junction of rings C and D axial or equatorial to ring C?
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