摘要:

Measurement was made of the rate of delignification of sprucewood with lithium, barium, sodium, potassium, and tetra-ethyl ammonium hydroxides under closely controlled conditions of temperature and concentration. The reaction rates were compared with the ionic mobilities and adsorption coefficients of the different alkalis. Methanol, ethanol, and glycerol were used as solvents.From these results a mechanism is suggested, according to which adsorption of alkali at the reaction interface is the determining factor in setting the rate of delignification. The rate is also dependent on the specific nature of the alkali cation and varies with the temperature in accordance with the general theory of thermal activation.

ISSN:1923-4287    

DOI:10.1139/cjr41b-001

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

The efficiency of wheat-germ oil in stabilizing vitamin A against the destructive action of ultra-violet radiations was investigated. A rapid and convenient method of estimating antioxidant potency is described which is based on ultraviolet irradiation of mixtures of halibut liver oil and antioxidant in chloroform solution and estimation of vitamin A by the direct application of the antimony trichloride reaction employing photoelectric colorimetry.

ISSN:1923-4287    

DOI:10.1139/cjr41b-002

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

Attempts, by three independent methods of synthesis, to prepare vanilloyl acetaldehyde are described. In each case it has been shown that the presence of a para phenolic hydroxyl group either prevents or alters the normal course of the reactions. The synthesis of veratroyl acetaldehyde has been accomplished, and this product is described. A theoretical explanation for the mutual interrelationship of the carbonyl and para phenolic hydroxyl group is suggested.

ISSN:1923-4287    

DOI:10.1139/cjr41b-003

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

The leaves ofCalycanthus floridusand ofC.glaucushave been shown to contain a polyhydric alcohol, C6H12O6, which has been identified as cocositol.

ISSN:1923-4287    

DOI:10.1139/cjr41b-004

出版商:NRC Research Press    

年代:1941

数据来源: NRC