摘要:

Nine alkaloids have been isolated fromCorydalis ophiocarpaonly one of which,ophiocarpine, C20H21O5N (F39), is definitely characterized as new. It is a hydroxy-canadine in which the hydroxy group probably occurs in position 13. A second alkaloid, which may be new, is referred to as alkaloid F40. Berberine, its tetrahydro-derivative, namelyl-canadine, andl-corypalmine constitute the remaining protoberberine alkaloids that were found. The presence ofl-adlumine was established. This is the third plant from which it has been isolated. In addition, protopine, α-allocryptopine and cryptocavine, all of which contain the ten-membered ring characteristic of the first, were isolated.

ISSN:1923-4287    

DOI:10.1139/cjr39b-009

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Chemical examination ofC.micranthaand ofC.crystallinahas shown that their relation is not as close toC.aureaas taxonomic classification would suggest.C.micranthawas found to contain protopine,l-tetrahydro-palmatine, capaurine, capauridine, scoulerine, and three unidentified phenolic alkaloids (F41, F42, and F43).C.crystallinayielded only a small amount of total bases from which protopine, bicuculline, and capnoidine were isolated.

ISSN:1923-4287    

DOI:10.1139/cjr39b-010

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Dried rubber latex containing graded amounts of copper ammonium acetate was aged in air (I) and in nitrogen (II), and the deterioration followed by determining the acetone-soluble resin,r, and the relative viscosity of benzene solutions,v. For (I),rdecreased slightly for a time, varying inversely with the amount of copper present, increased rapidly to a maximum, and finally decreased somewhat. The value ofvdecreased rapidly at a rate varying directly with the copper content. For (II),rremained constant, while a slight decrease inv, attributed to traces of oxygen, was of a different order fromvfor (I). It was concluded that copper, per se, is not deleterious but acts by catalytic oxidation.

ISSN:1923-4287    

DOI:10.1139/cjr39b-011

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The dipyridyl method of estimating available iron has been modified so that it can be applied directly to coloured extracts of plant tissues. By combining the dipyridyl method for iron with the carbamate method for copper, interference of iron with the copper determination has been eliminated and the simultaneous estimation of iron and copper on the same simple made possible.

ISSN:1923-4287    

DOI:10.1139/cjr39b-012

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The liquidus-solidus curves of the systems chrysene-1: 2-benzanthracene and 1: 2-benzanthracene-triphenylene are given. They provide a convenient method for the evaluation of the percentage composition of these mixtures.

ISSN:1923-4287    

DOI:10.1139/cjr39b-013

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

2,3-Diphenylbutadiene has been prepared and its behaviour in addition reactions investigated. It forms a 1,4-dibromide, a 1,4-monobromide by addition of one molecule of hydrogen bromide, is reducible to the saturated hydrocarbon, combines with oxides of nitrogen to form two isomeric dinitrobutenes, and couples with diazonium compounds. In the diene synthesis, products have been secured from maleic anhydride, acetylene dicarboxylic ester, quinone, and α-naphthoquinone. In so far as comparable reactions have been examined, 2,3-diphenylbutadiene resembles 2,3-dimethylbutadiene in the types of products formed by addition. Certain discrepancies recorded in the literature among related dibromides have been cleared up.

ISSN:1923-4287    

DOI:10.1139/cjr39b-014

出版商:NRC Research Press    

年代:1939

数据来源: NRC