摘要:

A chemical examination ofCorydalis caseanahas yielded a total of ten alkaloids. Of these, protopine, α-allocryptopine, bicuculline, corypalmine, and scoulerine are known alkaloids. The remaining five appear to be new and include:caseanine, C21H25O4N;casealutineandalkaloid F34, isomeric and represented by C20H23O4N;alkaloid F33, C19H21O4N; andalkaloid F35, C20H23O4N. The new alkaloids are phenolic except caseanine which is the monomethyl ether of casealutine and the dimethyl ether of aurotensine.

ISSN:1923-4287    

DOI:10.1139/cjr38b-023

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Linoleic acid has been prepared from sunflower seed oil by a modification of Rollett's method. The melting point of the solid tetrabromostearic acid is placed at 115.2 °C. The boiling point, specific gravity, iodine value, and refractive index of the ethyl ester and the melting point of the free acid were determined. Linoleamide was prepared, and its melting point is placed at approximately 58 °C. Through rebromination of the prepared linoleic acid, the isomeric liquid tetrabromostearic acid was isolated, and is described. Its reduced acid is shown to be identical with that derived from the solid isomer. From these data and additional data from the literature, it was concluded that bromination and debromination cause nocis-transisomerization, and that the two pairs of optically active enantiomorphous bromo derivatives exist, not because of their derivation from different acids, but rather because of the four asymmetric carbon atoms which they contain. Therefore, only one naturally occurring linoleic acid is at present known which is identical with that produced through reduction of the tetrabromide that melts at 115.2 °C. or the corresponding liquid derivative. No attempt is made to assign any particularcis-transconfiguration to this acid, or to exclude the theoretical existence of three others.

ISSN:1923-4287    

DOI:10.1139/cjr38b-024

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

The kinetics of the thermal decomposition ofn-butane has been investigated at pressures from 5 to 60 cm. and temperatures from 513 to 572 °C. The initial first order rate constants at high pressures are given byThe results are in good agreement with the work of Frey and Hepp, but differ greatly from that of Paul and Marek. The reaction rate falls off strongly with diminishing pressure; this is rather surprising for a molecule as complex as butane. The first order constants in a given run fall rapidly as the reaction progresses. The last two facts suggest that chain processes may be involved.A large number of analyses of the products of reaction have been made at various pressures, temperatures, and stages of the reaction, the method being that of low-temperature fractional distillation. The products are virtually independent of temperature and pressure over the range investigated. The initial products, obtained by extrapolation to zero decomposition, are:—H2, 2.9; CH4, 33.9; C3H6, 33.9; C2H4, 15.2; C2H6, 14.1%. The mechanism of the reaction is discussed, and the results are compared with those of the other paraffin decompositions.

ISSN:1923-4287    

DOI:10.1139/cjr38b-025

出版商:NRC Research Press    

年代:1938

数据来源: NRC