摘要:

Senecionine is the main alkaloid ofSenecio integerrimus, but a small amount of a new alkaloid,integerrimine(C18H25O5N), was also found.S.longilobuscontainslongilobine(C18H23O5N) andS.ridelliicontainsridelliine(C18H23O6N), both alkaloids being new. In addition to the main alkaloid ofS.spartioides, which was identified as seneciphylline, a minor base,spartioidine(C18H23O5N), apparently new, was obtained. Hydrolysis of the new alkaloids that were available in sufficient quantity for this purpose yielded, in all cases, retronecine and a new necic acid. A structural formula for senecic acid is proposed.It has been shown that chemical examination ofSeneciospp. may be used as an aid to botanical classification.

ISSN:1923-4287    

DOI:10.1139/cjr39b-001

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

An examination ofErechtites hieracifolia(L.) Raf., during which two alkaloids have been isolated, has emphasized the close chemical relation which the genusErechtitesbears toSenecio. The chief alkaloid,hieracifoline, C18H25O5N, on hydrolysis yields retronecine andhieracinecicacid. The alkaloid is therefore of the type generally elaborated bySeneciospecies.

ISSN:1923-4287    

DOI:10.1139/cjr39b-002

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

A simple and convenient method for the preparation of α-naphthyl-acetic acid from readily obtainable starting materials is described.

ISSN:1923-4287    

DOI:10.1139/cjr39b-003

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

In the course of a study of the synthesis of α-naphthyl-acetic acid, a method was elaborated by Dr. A. Cambron that made available large quantities of α-chloromethyl-naphthalene. During the purification of the crude product and in the later stages of the synthesis we have encountered a number of by-products. Among others, these include methyl α-naphthyl-methyl ether, di-α-naphthyl-methyl ether, α-naphthyl carbinol, and 1:5-bis-chloromethyl-naphthalene. The last-named was converted into 1:5-naphthylene-diacetic acid, m.p. 280 °C., via the corresponding nitrile. δ-(1-Naphthyl)-valeric acid, m.p. 84 °C., and ϵ-(1-naphthyl)-hexoic acid, m.p. 62 °C., were synthesized by standard procedures.

ISSN:1923-4287    

DOI:10.1139/cjr39b-004

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The root ofAsclepias syriacaL., contains an alkaloid which has been identified asl-nicotine. The base was characterized via its picrate and picrolonate.

ISSN:1923-4287    

DOI:10.1139/cjr39b-005

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The vapour phase cracking of a gas-oil fraction has been investigated under conditions of turbulent and streamline vapour flow. The results show that the increased rate of heat transfer and the more uniform temperature distribution brought about by turbulence cause a very marked increase in the amount of low boiling liquids and olefines produced at the lower temperatures, particularly in the range 600 to 700 °C. The character of the vapour flow was also found to have a marked influence on the composition of the liquid products, there being considerably more aromatics produced, especially at the higher temperatures, under conditions of highly turbulent flow.At 600 and 650 °C., for instance, 8.4 and 16.1% of the gas-oil put through was recovered as 205° end-point gasoline when an empty tube was used. However, when a baffled tube was employed, the yield of 205° end-point gasoline was 16.0 and 22.4% respectively, under the same conditions of temperature and liquid rates.At 800 °C. about 23% of the gas-oil put through was recovered as 205° end-point gasoline when either the empty or the baffled tube was used. In the latter experiments, however, 40% of the gasoline consisted of benzene and 20% of toluene, while in the former, the gasoline contained only about 15% of benzene and 5% of toluene.Experiments have been carried out in which a fraction of the off-gas was recirculated, with the entering gas-oil vapours, through the cracking furnace. Such a procedure did not increase the yield of gasoline, and apparently decreased the yield of aromatics.

ISSN:1923-4287    

DOI:10.1139/cjr39b-006

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The sorption of sodium hydroxide on black spruce has been measured at 20°, 50°, and 75 °C., and was found not to change very much between 20° and 75°. An increase in temperature causes the break in the sorption curve to occur at a higher concentration of alkali. Cooking action begins between 50° and 75°, and tends to obscure the effect of an increase in temperature above 50°.

ISSN:1923-4287    

DOI:10.1139/cjr39b-007

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The heat capacity of water adsorbed on cellulose has been measured by means of a new type of adiabatic calorimeter and a new experimental technique. Measurements have been made with 2, 4, 8, and 12% adsorbed water over the temperature range − 35° to + 25 °C. with considerable accuracy. A mechanism, that of a change in the amount of bound water with the temperature, has been suggested to explain the high values obtained for the apparent specific heats of adsorbed water.

ISSN:1923-4287    

DOI:10.1139/cjr39b-008

出版商:NRC Research Press    

年代:1939

数据来源: NRC