Determine the mechanism for cleavage reaction of the p-Dimethoxytrityl (DMT) ether. Concept introduction: The cleavage reaction of p-Dimethoxytrityl (DMT) takes place by the S N 1 mechanism. The S N 1 reaction is nucleophilic substitution reaction in which nucleophile is replaced by a leaving group. S N 1 indicates unimolecular, substitution and nucleophilic reaction. S N 1 reaction takes place in following two steps: Leaving group leaves and leaves behind carbocation intermediate. Nucleophilic attack on the carbocation to form final product. The stability of carbocation i.e. 3°>2°>1°, determines the rate of the reaction. Given information: The information given in the question is that the DMT ether is easily cleaved by the treatment with mild acid.

Question

Identify products A and B from the given 1H NMR data. Treatment of acetone [(CH3)2C=O] with dilute aqueous base forms B. Compound B exhibits four singlets in its 1H NMR spectrum at 1.3 (6 H), 2.2 (3 H), 2.5 (2 H), and 3.8 (1H) ppm. What is the structure of B?

Answer 1

Question

Chapter 28.7, Problem 11P

Interpretation Introduction

Interpretation:

Determine the mechanism for cleavage reaction of the p-Dimethoxytrityl (DMT) ether.

Concept introduction:

The cleavage reaction of p-Dimethoxytrityl (DMT) takes place by the S_N1 mechanism. The S_N1 reaction is nucleophilic substitution reaction in which nucleophile is replaced by a leaving group. S_N1 indicates unimolecular, substitution and nucleophilic reaction.

S_N1 reaction takes place in following two steps:

Leaving group leaves and leaves behind carbocation intermediate.

Nucleophilic attack on the carbocation to form final product.

The stability of carbocation i.e. 3°>2°>1°, determines the rate of the reaction.

Given information:

The information given in the question is that the DMT ether is easily cleaved by the treatment with mild acid.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

Identify products A and B from the given 1H NMR data. Treatment of acetone [(CH3)2C=O] with dilute aqueous base forms B. Compound B exhibits four singlets in its 1H NMR spectrum at 1.3 (6 H), 2.2 (3 H), 2.5 (2 H), and 3.8 (1H) ppm. What is the structure of B?

The ether, CH3OCH2CH3, can be prepared by two different nucleophilic substitution reactions, one using CH3O- as nucleophile and the other using CH3CH2O- as nucleophile. Draw both routes.

The Stork reaction is a condensation reaction between an enamine donor and an α,β-unsaturated carbonyl acceptor. The overall reaction consists of a three-step sequence of formation of an enamine from a ketone, Michael addition to an α,β-unsaturated carbonyl compound, and hydrolysis of the enamine in dilute acid to regenerate the ketone. Consider the Stork reaction between cyclohexanone and propenal Draw the structure of the product of the enamine formed between cyclohexanone and dimethylamine. - Michael addition to an α,β-unsaturated carbonyl compound, and - hydrolysis of the enamine in dilute acid to regenerate the ketone.