摘要:

The rate of heterogeneous sulphonation of chlorobenzene in sulphuric acid solutions of different concentrations has been found to increase with amount and concentration of acid used, and with increase of temperature. No appreciable amount of sulphone was formed under the conditions used.

ISSN:1923-4287    

DOI:10.1139/cjr48b-036

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

δ-Hydroxyvaleraldehyde, obtained by acid hydrolysis of dihydropyran, is a convenient starting material for the synthesis of D,L-lysine. Application to the aldehyde of the Bucherer modification of the Strecker synthesis for α-amino acids yields 5-δ-hydroxybutylhydantoin which is hydrolyzed into D,L-α-amino-ϵ-hydroxycaproic acid. D,L-Lysine is obtained from 5-δ-hydroxybutylhydantoin by bromination with hydrobromic acid into 5-δ-bromobutylhydantoin, amination of the bromo compound with ammonia, and hydrolysis of the hydantoin ring into D,L-lysine, readily isolated as the dipicrate.

ISSN:1923-4287    

DOI:10.1139/cjr48b-037

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The synthesis of L-α-guaiacyl glycerol ether is described.

ISSN:1923-4287    

DOI:10.1139/cjr48b-038

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The observation of Holmes and Mann that bromine is eliminated during the condensation of amyl and ethyl formate with ethyl γ-(2-bromo-4,5-dimethoxyphenyl)-butyrate, when sodium ethylate is the condensing agent, has led to the substitution of chlorine for bromine in the above product in the hope that it might withstand the conditions of the reaction. These expectations were not realized and the required dienophile (5-chloro-7,8-dimethoxy-3,4-dihydro-2-naphthoic acid) was not available by this method for combination with 2-ethoxybutadiene-1,3 as a route to possible degradation products of metathebainone. The 5-chloro-7,8-dimethoxy-3,4-dihydro-1-naphthoic acid has been prepared and the methyl ester added to 2-ethoxybutadiene. The enol ethyl ether of the resulting adduct was readily hydrolyzed in dilute mineral acid and the keto-ester characterized as its oxime and dinitrophenylhydrazone.

ISSN:1923-4287    

DOI:10.1139/cjr48b-039

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

An economical method is described for preparation of the explosivebis-nitroxyethylnitroöxamide from oxalic acid and monoethanolamine. Yields over 80% of theoretical may be obtained frombis-hydroxyethyloxamide by either batch or continuous process. The crude product must be purified before use by acetone-water crystallization. The formation of this explosive is found to be inhibited by nitrosylsulphuric acid which limits the nitration to thebis-nitroxyethyloxamide stage. The complete reaction is thought to proceed via this intermediate by a nonreversible nitration and then to decompose reversibly, if allowed to proceed too long, tobis-hydroxyethylnitroöxamide. There is some evidence that the explosive is stabilized by its decomposition products. The use of this high explosive does not present the industrial health hazard caused by tetryl, with which it is comparable in power and brisance. Furthermore, it has the advantage over tetryl that it can be melted and poured. The solidified melt is unique among explosives because it is free from gross cavities.

ISSN:1923-4287    

DOI:10.1139/cjr48b-040

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

The thermal decompositions of cellobiose, maltose, dextrose, and potato starch have been studied over a temperature range, by following the production of volatile products. Carbon dioxide, carbon monoxide, and water with small quantities of acids, aldehydes, and volatile solids were produced in all cases. With cellobiose, the first step of the reaction, which involved the elimination of two moles of water per mole of sugar, could be separated from the second step, where the oxides of carbon were produced, by controlling the reaction temperature. Dextrose first dimerized by a rapid reaction and then decomposed in much the same manner as cellobiose. The behavior of maltose was anomalous and no dehydration by a separate step could be detected. The decomposition of potato starch was similar to the second step of the cellobiose reaction.

ISSN:1923-4287    

DOI:10.1139/cjr48b-041

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr48b-042

出版商:NRC Research Press    

年代:1948

数据来源: NRC