The systematic name for the given steroid is to be determined. Concept introduction: Steroids are a group of compounds that are obtained from lipids of plants and animals. Chemically, they are the derivatives of perhydrocyclopentanophenanthrene ring system. Pregnane is a 21-carbon saturated hydrocarbon steroid that is responsible for producing progestins. It is an alkane -based steroid, but group of 5 − α or β − pregnan-ol are alcohol-based steroids. Androstan are a group of steroid hormones. The 5 α − Estran − one group of steroids include hormones, such as androgen, estrogen, and progesterone. The numbering of the carbon atoms and naming of the ring system are done as shown in the figure. The A, B ring junction may be cis or trans , but B, C and C, D ring junctions are mostly trans . The methyl groups attached at the points of the ring junction are called angular methyl groups and they are the reference points for the stereochemical designations. Conventionally, groups that lie on the top of the molecule, same as that of the angular methyl group, are designated as β − groups while those at the bottom are designated as α − groups . When α and β positions are applied for hydrogen atom at C-5, and the A, B ring junction is cis , it is designated as 5 β − series and when the A, B ring junction is trans , it is designated as 5 α − series . The nature of the R − group(s) at the carbon-position determines the base name of the individual steroid.

Question

Want to see the full answer?

Answer 1

Question

Chapter 23, Problem 7Q

Interpretation Introduction

Interpretation:

The systematic name for the given steroid is to be determined.

Concept introduction:

Steroids are a group of compounds that are obtained from lipids of plants and animals. Chemically, they are the derivatives of perhydrocyclopentanophenanthrene ring system.

Pregnane is a 21-carbon saturated hydrocarbon steroid that is responsible for producing progestins. It is an alkane-based steroid, but group of 5−α or β− pregnan-ol are alcohol-based steroids.

Androstan are a group of steroid hormones. The 5α−Estran−one group of steroids include hormones, such as androgen, estrogen, and progesterone.

The numbering of the carbon atoms and naming of the ring system are done as shown in the figure. The A, B ring junction may be cis or trans, but B, C and C, D ring junctions are mostly trans.

The methyl groups attached at the points of the ring junction are called angular methyl groups and they are the reference points for the stereochemical designations.

Conventionally, groups that lie on the top of the molecule, same as that of the angular methyl group, are designated as β−groups while those at the bottom are designated as α−groups. When α and β positions are applied for hydrogen atom at C-5, and the A, B ring junction is cis, it is designated as 5β−series and when the A, B ring junction is trans, it is designated as 5α−series.

The nature of the R−group(s) at the carbon-position determines the base name of the individual steroid.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

You are trying to decide if there is a single reagent you can add that will make the following synthesis possible without any other major side products: xi 1. ☑ 2. H₂O хе i Draw the missing reagent X you think will make this synthesis work in the drawing area below. If there is no reagent that will make your desired product in good yield or without complications, just check the box under the drawing area and leave it blank. Click and drag to start drawing a structure. There is no reagent that will make this synthesis work without complications. : ☐ S ☐

Predict the major products of this organic reaction: H OH 1. LiAlH4 2. H₂O ? Note: be sure you use dash and wedge bonds when necessary, for example to distinguish between major products with different stereochemistry. Click and drag to start drawing a structure. G C टे

For each reaction below, decide if the first stable organic product that forms in solution will create a new C-C bond, and check the appropriate box. Next, for each reaction to which you answered "Yes" to in the table, draw this product in the drawing area below. Note for advanced students: for this problem, don't worry if you think this product will continue to react under the current conditions - just focus on the first stable product you expect to form in solution. NH2 CI MgCl ? Will the first product that forms in this reaction create a new CC bond? Yes No MgBr ? Will the first product that forms in this reaction create a new CC bond? Yes No G टे