Abstract

In experiments in vitro on rat epididymal adipose tissue the dose-response curves of the lipid mobilizing effects of catecholamine and oxedrine derivatives N-substituted by H-, Me-, Et-, nPr-, nBu- iPtr-, tBu- and F tBu- (phenyl- t-butyl) were investigated. In the catecholamine derivatives, the affinities were almost equal showing only a slightly rising trend towards derivatives substituted with richly branched radicals; with oxedrines, the pD 2-values rose with progressive N-substitution approximately twice as rapidly as with catecholamines. The sequence of affinities iPr > H > Me, unusual in adrenergic reactions, was observed in both homologous series.

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