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1. A series of 1-benzylcycloalkylamines with cycloalkyl rings of five, six or seven carbons and with various benzyl ring substituents (3-Cl, 4-Cl, 4-F, 3-CF3) was prepared and tested for anorectic and motor activity effects in rats. 2. Two potent, non-stimulant, anorectics were found: 1-(3-chlorobenzyl)-cycloheptylamine, and its N-methyl analogue. The activity of these compounds resembled that of chlorphentermine.

1. A novel activity cage for rats is described. Eight light beams are aimed at a light-conducting perspex rod at the centre of a cylindrical cage. The photoresistor at the end of the rod detects the changes in light intensity produced by interruption of the light beams. 2. The apparatus is simple to operate and was capable of detecting small differences in the motor activity of groups of rats. 3. Dose-dependent increases in motor activity were produced by dexamphetamine (1.36 to 27.3 mumol/kg, i.p.). The depressant effects produced by 20 mumol/kg doses of nonfenfluramine were greater than those of fenfluramine. Large doses (100 mumol/kg) of tranylcypromine stimulated motor activity whereas its cis-isomer, cis-2-phenylcyclopropylamine, depressed motor activity.

A series of 1-(2-thienyl)-2-phenylethylamines was synthesized and tested for anorectic and motor activity effects in rats. Phenyl ring substituents included Cl, Br, F, CF3, CH3, OCH3, and NO2; amino group substituents included alkyl, benzyl and acetyl groups. About half of the compounds produced significant anorexia; only one of these active anorectics increased motor activity. The three most potent non-stimulant anorectics were: 1-(2-thienyl)-2-(4-chlorophenyl)ethylamine, its N-isopropyl analogue, and N-isopropyl-1-(2-thienyl)-2-(4-fluorophenyl)ethylamine.

A series of 1,2-diphenylethylamines has been synthesized in which the phenyl rings were substituted with Cl, OCH3 or CF3 at various positions and in various combinations. Four N-ethylpiperazino and N-ethylmorpholino compounds were also prepared. When tested in rats, some of the compounds were found to be potent anorectics and none of them stimulated motor activity.

1. The anorectic and motor activity effects of 1-aminoindane, 2-aminoindane, some N-substituted 2-aminoindanes, 2-aminotetralin, amphetamine and fenfluramine were determined in rats. 2. The two compounds with structures most like the extended conformation of amphetamine, 2-aminotetralin and 2-aminoindane, were potent anorectics. At dosages which halved the intake of food over 1 h, amphetamine increased motor activity, 2-aminotetralin had no effect, and 2-aminoindane reduced motor activity. 3. Both the anorectic and central stimulant actions of 2-aminoindane were absent in N-ethyl- and N-isopropyl-2-aminoindane. 4. 1-Aminoindane, whose structure is like the folded conformation of amphetamine, produced a small anorectic effect and depressed motor activity.