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The main active ingredients of the mothproofing agent Eulan WA Neu are the N-chloromethylsulphone derivatives of 2′,3,4,4′,5-pentachloro-2-aminodiphenyl ether and 2′,3,4,4′,5,6-hexachloro-2-aminodiphenyl ether. The structures o the pentachloro-2-aminodiphenyl ether and some related compounds are discussed on the basis of n.m.r. spectroscopic data. Orientating ring closure experiments were done by heating some of the Eulan WA Neu compounds to about 390°C. The ersults of g.c./m.s. studies indicated the formation of polychlorinated dibenzodioxins, dibenzofurans and phenoxazines.

A rapid and efficient clean-up of extracts of biphenyl from citrus fruits for spectrophotometric determination is described. The analytical procedure is based on a method suggested by Gunther, Blinn and Barkley.

Summary. Glycerides containing a fraction of a percentage of 2,2-dimethyl[1-14C] long-chain fatty acids, the ester bonds of which are resistent to the action of pancreatic lipase, have been fed to human subjects. From the concentration of the labelled acid in the neutral fat of the intestinal contents it is possible to calculate the real extent of hydrolysis of the glyceride esters fed if it is assumed that the different glycerides are absorbed at the same rate. The results show that as a mean around sixty per cent of fed glyceride ester bonds are split in the lumen of the small intestine before absorption. About forty per cent of the fed triglycerides are completely hydrolyzed to glycerol and fatty acids, the remaining sixty per cent are partly hydrolyzed to an extent of around forty per cent, giving rise to a mixture of tri-, di- and monoglycerides and free fatty acids. It is, therefore, clear that fatty acids fed to human subjects in the form of triglycerides are absorbed from the small intestine to a greater extent as free fatty acids than as glycerides. We are indebted to Prof. S. Bergstrom for placing the 13C-labelled glycerides at our disposal. The technical assistance of Mrs. M. B. Nilsvik and Miss K. Sjostrom is gratefully acknowledged. The investigation has been supported by grants from Statens Medicinska Forsk-ningsrad, from Knut och Alice Wallenbergs Stiftelse, from the Medical Faculty of the University of Lund and from Statens naturvetenskapliga forskningsrad.

3-Acyl-1,5-dibrom-pentane I und IX geben durch Erhitzen mit methanolischem Ammoniak auf 110° sauerstoffreie bicyclische, ungesattigte Basen, welchen auf Grund ihrer physikalischen und chemischen Eigenschaften die Konstitution VI bzw. X zugeschrieben werden konnte.

The proportion of methylmercury to total mercury in the flesh of salmon (Salmo salar) 1 to 7 years old and sea trout (Salmo ocla) 1 and 2 years old was found to average 93 percent with a range of 81 to 98 percent, and to be independent of the age of the fish. In salmon and sea trout 1 and 2 years old, methylmercury constituted 26 to 67 percent of the total visceral mercury, without age dependence.

Biphenyl and 2-phenylphenol are steam distilled from a citrus fruit homogenate into two portions of cyclohexane. An aliquot of the first extract is analysed for biphenyl by gas-liquid chromatography. Aliquots of the first and second extracts are combined and then cleaned up and concentrated by means of further extractions prior to the gas-liquid chromatographic determination of 2-phenylphenol.