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From an analysis of the infrared spectra of dimethylaminophenols and their methiodides, along with their -N(CD3), and -N+(CD3)3 derivaties, the characteristic absorptions of the -N(CH3)2 and -N+(CH3)3 groups have been assigned. Strong absorptions near 950 cm-', generally ascribed to C-N stretching modes in a large number of compounds containing the -N+(CH3)3 group, have been found to arise from CH3 rocking modes. EXPERIMENTALTrimethyl sulphoxonium iodide was prepared l7 by refluxing dimethyl sulphoxide with 2.25 times the stoichiometric amount of methyl iodide for 4 days. I t was deuterated thrice with D20 (99.8 %) in the presence of sodium carbonate. [2H,]Methyl iodide obtained by