摘要:

The reaction of hydrogen atoms with propane has been investigated over the temperature range 30° to 250 °C. by the Wood-Bonhoeffer method. The products are solely methane at low temperatures, and methane, ethane, and ethylene at higher temperatures.It is concluded that the results can be explained only by the assumption that the reactionis of importance. The bearing of this on the Rice-Herzfeld mechanisms is discussed. The activation energy of the reaction is 10 ± 2 Kcal.The main steps in the postulated mechanism are:Primary ReactionSecondary Reactions at Low TemperaturesAdditional Secondary Reactions at High TemperaturesThe reaction of deuterium atoms with propane was also investigated. It was found that the methane and ethane produced were highly deuterized, while the propane was not appreciably exchanged.

ISSN:1923-4287    

DOI:10.1139/cjr39b-051

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Silica tannage, usually in combination with other methods, has been extensively investigated, but no process in which silicon compounds were the principal agent has reached the commercial stage.Ethyl and methyl orthosilicate have been found to possess a marked tanning action when hydrolysed in dehydrated or pretanned pelt. Details of the preparation of silica-tanned leather, analyses and hydrothermal behaviour of the resulting material, and significance of the new method of tannage are discussed.

ISSN:1923-4287    

DOI:10.1139/cjr39b-052

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

In continuation of earlier studies on the formation of alkyl-isoureas by the addition of alcohols to cyanamide, a series of new isoureas has been prepared from ethylene glycol, glycol mono-ethyl ether, glycol mono-acetate, ethyl glycollate, ethanolamine, and resorcinol. In addition, the preparation of allyl-isourea, which had previously failed,m-nitrobenzyl- and cyclohexyl-isoureas was accomplished. The new isoureas were characterized by the preparation of salts (salicylates or benzoates), and of cyclic isoureides by condensation with acetoacetic and malonic esters. Some further study was made of benzyl- and phenylethyl-isoureas, previously prepared in this laboratory.

ISSN:1923-4287    

DOI:10.1139/cjr39b-053

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

An exhaustive examination ofGlaucium flavumhas revealed the presence of luteanine, isocorydine, aurotensine, and alkaloid F47 (not yet characterized), in addition to the two alkaloids already known to be present, namely, protopine and glaucine.

ISSN:1923-4287    

DOI:10.1139/cjr39b-054

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The effects of a series of sugars, aldehydes, and other substances on the time of set of silica gels have been investigated over a pH range. Diacetone alcohol, propionaldehyde, rhamnose hydrate, and xylose give curves similar to those previously obtained with the alcohols having a constant and equal effect at pH 7. The hexoses behave as a group while the disaccharides show divergent effects. Propionaldehyde and acetone give very similar curves. The implications of the results are discussed.

ISSN:1923-4287    

DOI:10.1139/cjr39b-055

出版商:NRC Research Press    

年代:1939

数据来源: NRC