An explanation corresponding to the given statement that the treatment of cholesterol with mCPBA results in formation of a single epoxide A, not the isomeric epoxide B is to be stated. Concept introduction: Steroids, a group of tetracyclic lipids composed of one five-membered ring and three six-membered rings. These rings are lettered by A , B , C , and D . Most of the steroids contain two angular methyl groups. These methyl groups are numbered as C18 and C19 respectively.

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Chapter 29.8, Problem 17P

Interpretation Introduction

Interpretation: An explanation corresponding to the given statement that the treatment of cholesterol with mCPBA results in formation of a single epoxide A, not the isomeric epoxide B is to be stated.

Concept introduction: Steroids, a group of tetracyclic lipids composed of one five-membered ring and three six-membered rings. These rings are lettered by A, B, C, and D. Most of the steroids contain two angular methyl groups. These methyl groups are numbered as C18 and C19 respectively.

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