摘要:

Corydalis lutea(L.) DC. has yielded a total of seven alkaloids, four of which, namely: protopine,l-tetrahydro-palmatine,l-isocorypalmine, and isocorydine, are well known from other sources. The occurrence of the last, unaccompanied by corydine, is unique thus far. The namestylopineis retained for one of the alkaloids. On racemization it yieldsdl-tetrahydro-coptisine.Ochrobirine(alkaloid F14), one of the constituents, contains an esterifiable non-phenolic hydroxyl group, and the suggestion is advanced that it may be 13-hydroxy-protopine. Finally, a new non-phenolic alkaloid for which the nameluteanine(alkaloid F44) is proposed, was found. It is isomeric with cularine, C20H23O4N, and, like the latter, contains three methoxyl groups and an indifferent oxygen atom. It is pointed out that the nature of the chemical constituents, in this case alkaloids, offers a possible means of determining interrelations within a family. The close relation betweenC.lutea,C.claviculata, andC.ochroleuca, which has been proposed on morphological grounds, is not evidenced in the alkaloid constituents.

ISSN:1923-4287    

DOI:10.1139/cjr39b-015

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Eight alkaloids have been isolated fromCorydalis ochroleucaKoch. Of these, six, namely, protopine, ochrobirine,l-tetrahydro-palmatine, bicuculline,l-corypalmine, andl-isocorypalmine, have been described from other sources. The last was the most abundant of the alkaloids in this plant, and was isolated in 0.11% yield of the dry weight. Two apparently new alkaloids have also been found. They are referred to asalkaloid F45(C20H19O8N) andalkaloid F46. The former is phenolic and the latter contains a methylenedioxy group.

ISSN:1923-4287    

DOI:10.1139/cjr39b-016

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The corrosion of iron electrodes when a.c. is used was found to be a function of the composition and concentration of the electrolyte and of arcing on the electrodes. No particularly corrosive effect could be attributed to the presence of chlorides, but sulphates were found to induce corrosion. Magnesium and calcium salts inhibited corrosion even in the presence of sulphates. The addition of a soluble magnesium salt to the feed water and the operation of the generator under pressure in order to prevent arcing are suggested as a means of minimizing corrosion of the electrodes in a boiler of the resistor type.

ISSN:1923-4287    

DOI:10.1139/cjr39b-017

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

An investigation has been made of the inhibition of free radical chain processes in the decomposition ofn-butane by the addition of nitric oxide. The method was to initiate chains in butane at low temperatures by means of ethylene oxide, and then to investigate the efficiency of nitric oxide in suppressing these chains.It was found that nitric oxide is not completely efficient as a chain breaker, inasmuch as sensitization by ethylene oxide persisted in the presence of large amounts of nitric oxide. It is therefore concluded that maximum inhibition of organic decomposition reactions by nitric oxide does not in all cases correspond to complete suppression of chains, and hence the real chain length in such reactions may be greater than that inferred from the results of the nitric oxide inhibition method.

ISSN:1923-4287    

DOI:10.1139/cjr39b-018

出版商:NRC Research Press    

年代:1939

数据来源: NRC