摘要:

A method of fractionating the chloroform soluble constituents of maple syrup has been devised. Marked differences were observed among Quebec syrups of different years. Fat constituted half the weight of the extract of the 1935 syrup but was completely absent in the 1936, and present in very small quantity in the 1937, product. Crystals of carbonyl compounds having vanillin odour were isolated from bisulphite fractions of the 1935 and 1936 extracts, but the crystals from the two years' syrups differed from each other in melting point and chemical behaviour. Vanillin was not found. An odourless fraction constituting 35% in 1935 and 65% in 1936 had a composition and a behaviour similar to those of lignin. The substance chiefly responsible for maple odour is indicated to be an enolic viscous oil, volatile at 0.03 mm., and present in the 1936 and 1937 syrups in the proportions of 0.6 gm. per 100 gal. of syrup, or about 1 p.p.m.

ISSN:1923-4287    

DOI:10.1139/cjr39b-039

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

A new modification of Williamson's ether synthesis, using sodium naphthalene to form the metal alcoholate, has been described, by which the yields and ease of preparation of ethers have been improved.

ISSN:1923-4287    

DOI:10.1139/cjr39b-040

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The alkaloid calycanthine (C22H26N4), when degraded with selenium, yields a mixture of norharman, lepidine, skatole, β-ethyl-indole and a base. Heating calycanthine with palladium liberates ammonia. Benzoylation followed by oxidation brings about scission of the molecule into benzoyl-N-methyl-tryptamine and an acidic fragment which contains a benzoylated nitrogen, and another nitrogen, presumably included in a ring. A chemical structure which will account for these results is suggested. On the basis of the suggested formula, the foregoing acidic fragment should contain a hydroquinoline nucleus and it should be possible to dehydrogenate it to quinoline. Such is found to be the case. The formula suggested by Barger, Madinaveitia, and Streuli (1) is discussed.

ISSN:1923-4287    

DOI:10.1139/cjr39b-041

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Several devices convenient in semi-micro preparation and purification of organic substances are described. A modified side-arm test tube is suggested as of general utility in microchemical laboratory technique.

ISSN:1923-4287    

DOI:10.1139/cjr39b-042

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The fluorine removing capacities of a large number of materials have been investigated. Many of these have been found to have little or no effect on the fluorine content of the water, while others have lowered the fluorine content but not enough to prevent mottling of the teeth.Two materials, specially prepared aluminium oxide and freshly precipitated aluminium phosphate, have been examined and have been found to be equal to, or better than, other materials which have been proposed previously. These two have been compared with activated alumina, tricalcium phosphate, and magnesium oxide, materials reported upon by other writers.Experiments on these have been carried out using the filtration technique and the stirring and standing technique with good results.A commercial defluorite unit, containing tricalcium phosphate, supplied by the National Aluminate Corporation, has been tried out at three points in Alberta and found to have a high fluorine removing capacity.

ISSN:1923-4287    

DOI:10.1139/cjr39b-043

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The Kozeny equation relating specific surface and permeability of a bed of unconsolidated particles has been shown to be applicable to fibrous materials such as glass, wool, and celanese. The diameters of the constituent fibre may be as small as 0.0006 cm., while their ratio of length to diameter may be indefinitely large. Uniformity of size or of packing is not essential.

ISSN:1923-4287    

DOI:10.1139/cjr39b-044

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The pigments in silage which have been formed from xanthophyll by acids and which interfere in the determination of carotene have been separated by chromatographic methods and found to exhibit solubilities intermediate between those of carotene and xanthophyll. A method based on the partition coefficient of carotene and the interfering pigments in the system hexane-benzyl alcohol was found to give reliable estimates of carotene.

ISSN:1923-4287    

DOI:10.1139/cjr39b-045

出版商:NRC Research Press    

年代:1939

数据来源: NRC