/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q54P Draw the mechanism for the forma... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 20: Q54P (page 984)

Draw the mechanism for the formation of 尾-lactose from a 伪- D-galactose and 尾- D-glucose in dil HCl.

Short Answer

Expert verified

Lactose, a disaccharide is a sugar made up of galactose and glucose subunits with the molecular formula C12H22O11. Lactose makes around 2-8% of milk. 尾-lactose is the beta anomer of lactose. It is a natural product found in Arisaema tortuosum and hypericum perforatum.

Step by step solution

01

Introduction

Lactose, a disaccharide is a sugar made up of galactose and glucose subunits with the molecular formula C12H22O11. Lactose makes around 2-8% of milk. 尾-lactose is the beta anomer of lactose. It is a natural product found in Arisaema tortuosum and hypericum perforatum.

02

Mechanism

As we can see that in the first step proton transfer occurs with HCl followed by the elimination of water. Now, nucleophilic addition of beta -D-glucose occurs at electrophilic carbonyl carbon of alpha-D-galactose. After this step occurs the deprotonation and thus, beta lactose is obtained. The raction mechanism can be represented as-

Mechanism of formation of 尾 - lactose

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

How many aldaric acids are obtained from the 16 aldohexoses?

What is the main structural difference between

a. amylose and cellulose?

b. amylose and amylopectin?

c. amylopectin and glycogen?

d. cellulose and chitin?

What sugar is the C-3 epimer of D-fructose?

To synthesize D-galactose, a student went to the stockroom to get some D-lyxose to use as a starting material. She found that the labels had fallen off the bottles containing D-lyxose and D-xylose. How can she determine which bottle contains D-lyxose?

Identify A, B, C, and D in the preceding problem if D is oxidized to an optically inactive aldaric acid; if A,B, and C are oxidized to optically active aldaric acids; and if interchanging the aldehyde and alcohol groups of A leads to a different sugar.
See all solutions

Recommended explanations on Chemistry Textbooks

Nuclear Chemistry

Read Explanation

Inorganic Chemistry

Read Explanation

The Earths Atmosphere

Read Explanation

Kinetics

Read Explanation

Physical Chemistry

Read Explanation

Chemical Reactions

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.