/*! 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} Question 53 聽Draw the following sugar deriv... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 23: Question 53 (page 1255)

Draw the following sugar derivatives.

  1. ethyl-尾-D-glucopyranoside
  2. 2,3,4,6-tetra-O-ethyl-D-mannopyranose
  3. 1,3,6-tri-O-ethyl-D-fructofuranose
  4. Ethyl-2,3,4,6-tetra-O-methyl-尾-D-galactopyranoside

Short Answer

Expert verified

Answer :

Step by step solution

01

Diagrams of the given sugar derivates:

Pyranose is a cyclic hemiacetal form of a monosaccharide having a six-membered ring whereas pyranoside is glycoside form of pyranose. Furanose can be either hemiacetal or hemiketal and possess five-membered ring structure which consist of carbon and oxygen atoms.

2,3,4,6-tetra-O-ethyl-D-mannopyranose

1,3,6-tri-O-ethyl-D-fructofuranose

ethyl-2,3,4,6-tetra-O-methyl--D-galactopyranoside

ethyl--D-glucopyranoside

02

Naming of the sugar derivates

The carbohydrate part of the molecule is known as glycone and the -O- bridge is glycosidic oxygen. The linkage present is named in the middle of the pyranoside or furanose or pyranose sugar. Saccharide name ends with 鈥榠de鈥� or 鈥榦se鈥�.

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

Draw the structures (using chair conformations of pyranoses) of the following disaccharides.

(a) 4-O-(伪 -D-glucopyranosyl)-D-galactopyranose

(b) 伪 -D-fructofuranosyl-尾 -D-mannopyranoside

(c) 6-O-(尾 -D-galactopyranosyl)-D-glucopyranose

Question. Retroviruses like HIV, the pathogen responsible for AIDS, incorporate an RNA template that is copied into DNA during infection. The reverse transcriptaseenzyme that copies RNA into DNA is relatively nonselective and error-prone, leading to a high mutation rate. Its lack of selectivity is exploited by the anti-HIV drug AZT (3鈥�-azido-2鈥�,3鈥�-dideoxythymidine), which becomes phosphorylated and is incorporated by reverse transcriptase into DNA, where it acts as a chain terminator. Mammalian DNA polymerases are more selective, having a low affinity for AZT, so its toxicity is relatively low.

  1. Draw the structures of AZT and natural deoxythymidine.
  2. Draw the structure of AZT 5鈥�-triphosphate, the derivative that inhibits reverse transcriptase.

Erwin Chargaff鈥檚 discovery that DNA contains equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine has come to be known as Chargaff鈥檚 rule:

G = C and A = T

(a) Does Chargaff鈥檚 rule imply that equal amounts of guanine and adenine are present in DNA? That is, does G = A?

(b) Does Chargaff鈥檚 rule imply that the sum of the purine residues equals the sum of the pyrimidine residues? That is, does A + G = C + T?

(c) Does Chargaff鈥檚 rule apply only to double-stranded DNA, or would it also apply to each individual strand if the double helical strand were separated into its two complementary strands?

Predict the products formed when the following sugars react with excess acetic anhydride and pyridine.

  1. 伪-顿-驳濒耻肠辞辫测谤补苍辞蝉别
  2. 尾-顿-谤颈产辞蹿耻谤补苍辞蝉别

Give an equation to show the reduction of Tollens reagent by maltose.
See all solutions

Recommended explanations on Chemistry Textbooks

Chemistry Branches

Read Explanation

Inorganic Chemistry

Read Explanation

Physical Chemistry

Read Explanation

Nuclear Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Organic Chemistry

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.