As a continuation of studies [3, 4] concerned with the search for new effective $-adrenergic blockers and structure-action relationships, we synthesized homologs of a! prenolol which differs from many B-adrenergic blockers in its less pronounced internal sympathomimetic activity which leads to myocardial suppression [9, ii]. In order to study the effect of the methyl group in the meta-and para-positions relative to the side aminopropanol group in the ...