Gas‐phase NMR studies of chemical equilibria: 1—Methodology

Methods for obtaining 1 H NMR spectra of gases are discussed. Particular attention is paid to the nature of the tube and to the use of ‘second sample’ field/frequency locking. The question of the chemical shift reference is examined, and some results for tetramethylsilane gas are presented. Representative spectra are shown for three types of organic equilibria in the gas phase: keto‐enol tautomerism, addition of methanol to acetaldehyde and Z ‐ E isomerism of acetaldoxime.