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

Part VII. Below are the 'HNMR, 13 C-NMR, COSY 2D- NMR, and HSQC 2D-NMR (similar with HETCOR but axes are reversed) spectra of an organic compound with molecular formula C6H1003 - Assign chemical shift values to the H and c atoms of the compound. Find the structure. Show complete solutions. Predicted 1H NMR Spectrum 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 f1 (ppm) Predicted 13C NMR Spectrum 100 f1 (ppm) 30 220 210 200 190 180 170 160 150 140 130 120 110 90 80 70 -26 60 50 40 46 30 20 115 10 1.0 0.9 0.8 0 -10

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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.

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