Chapter 16, Problem 16.49P

Interpretation Introduction

Interpretation:

The reason for TMS having a lower chemical shift than its carbon analog, dimethylpropane, ${{\text{(CH}}_{\text{3}}\text{)}}_{\text{4}}\text{C}$, is to be explained.

Concept introduction:

The ${\text{CH}}_{\text{3}}$ groups attached to less electronegative central atom than C take more electron density from the central atom. More electron density around ${\text{CH}}_{\text{3}}$ groups makes H atoms and C atoms more shielded, which gives lower chemical shift.