摘要:

Reinvestigation of the active nitrogen–ethylene reaction has confirmed hydrogen cyanide as the principal product. Smaller quantities of ethane, cyanogen, acetylene, and methane have also been found and the variations in amounts of these products with ethylene flow rate have been established. No significant amount of polymeric material was found.

ISSN:0008-4042    

DOI:10.1139/v53-001

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The condensation of benzene with chloral hydrate in the presence of concentrated sulphuric acid gave rise to 1,1,1-trichloro-2,2-bis-(p-tolyl)-ethane. The oxidation of this condensation product with potassium dichromate in dilute sulphuric acid at the boiling temperature yielded 1,1-dichloro-2,2-bis-(p-carboxyphenyl)-ethylene, the structure of which was shown by its oxidative degradation to 4,4′-dicarboxybenzophenone. When the oxidation of the same condensation product was carried out in the cold, with the aid of chromium trioxide in glacial acetic acid and acetic anhydride, 1,1,1-trichloro-2,2-bis-(p-carboxyphenyl)-ethane was obtained in a good yield. This last compound was converted to the dichloroethylenic-dicarboxylic acid upon refluxing with a methanolic solution of sodium hydroxide. The corresponding amide derivatives of both the dichloro and trichlorodicarboxylic acids were also prepared.

ISSN:0008-4042    

DOI:10.1139/v53-002

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

N-Benzoylphenylhydroxylamine precipitates tin quantitatively from stannic chloride solutions; complete precipitation is obtained in solutions varying from 1 to 8% in concentrated hydrochloric acid. The reagent reduces stannic to stannous tin before forming the addition compound (C13H11O2N)2SnCl2; this compound is stable and may be used as a weighing form for tin. Tin can be determined readily in brasses; copper, lead, and zinc do not interfere.

ISSN:0008-4042    

DOI:10.1139/v53-003

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

Kinetic studies of a redox-initiated polymerization have indicated activation energies of 9.7 kcal. per mole for the decomposition of the initiating system, approximately 6 kcal. per mole for the propagation reaction, and 9.0 kcal. per mole for the consumption of MTM-4 in the emulsion system. Lower polymerization temperatures raised the gel point without shortening the polymer chains, apparently by decreasing the proportion of cross-linking to propagation reactions. Two types of nonmercaptan termination have been found to occur to appreciable extents: mutual termination of free radicals and a termination process involving the emulsifier.

ISSN:0008-4042    

DOI:10.1139/v53-004

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

A method was developed to follow the hydroxylation of rapeseed oil and erucic acid derivatives with peracetic acid. Peracetic acid preparedinsituwas found to be equally as effective as the preformed acid in hydroxylation of methyl erucate. Among the compounds synthesized were ethyl 13,14-dihydroxybehenate, methyl 13,14-oxidoerucate, ethyl 13,14-diacetoxybehenate, and methyl 13,14(14,13)-hydroxyacetoxybehenate which were subsequently pyrolyzed at approximately 300 °C withp-toluenesulphonic acid as catalyst. The first compound yielded mainly the corresponding ketone with a small amount of the oxido derivative, the chief product of the second compound was also the ketone with some unsaturated material, the third compound yielded 43% of the diene, while the last one yielded 60%. Ammonolysis of the oxido compound or the bromohydrin to yield the corresponding aminohydroxy derivative under pressure with liquid ammonia and ammonium bromide was unsuccessful. A new compound oxidoerucamide, m.p.101.5°, was synthesized.

ISSN:0008-4042    

DOI:10.1139/v53-005

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The following benzene derivatives have been pyrolyzed in a free radical mass spectrometer: benzene, toluene, benzaldehyde, anisole, diphenyl, phenyl ether, and benzyl ether. The products and intermediates were analyzed, particular attention being paid to the formation (and stability) of any aromatic free radicals found. The phenyl, benzyl, phenoxy, and benzoyl radicals, as well as atomic carbon, were detected. The first two could be obtained abundantly and are fairly stable below 1150°. The oxygenated radicals were much less abundant and appeared to be less stable.

ISSN:0008-4042    

DOI:10.1139/v53-006

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The ultraviolet absorption spectra of the ammonia and amine addition products of 1-nitro-2-nitramino-2-imidazoline verify the linear structureAfor these compounds. Also the ethanol addition product is considered on the basis ofits absorption spectrum to be N-β-nitraminoethyl-N-nitro-o-ethylisourea. The relative effects of the nitramino and nitroguanidine chromophores on the absorption spectra of several nitroguanidine derivatives are discussed.

ISSN:0008-4042    

DOI:10.1139/v53-007

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The fission yield of Te134has been found to be 6.48% ± 0.47%. This makes the cumulative yield of I1347.71% using Glendenin's value of 0.19 as the independent fractional chain yield of I134. This value, since it is very close to that found by Thode for Xe134, offers additional confirmation of the 54 min. iodine assignment to mass 134.

ISSN:0008-4042    

DOI:10.1139/v53-008

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

Under suitable conditions, the coagulation of GR-S latex by sulphuric acid has been found to exhibit second order rate characteristics, and to be represented by the equation,whereCis the concentration of polymer at timet,C0is the initial concentration of polymer, and (H+)′ is the concentration of H+ion in excess of the critical concentration necessary to initiate coagulation. Coagulation is accompanied by desorption of soap from the surface of the latex particles, and the variation of surface tension resulting from this follows the equation log γ = A − Blogt, where γ is the surface tension andAandBare constants. Appropriate adjustment of the temperature was found to stabilize the emulsion markedly in the presence of acid. A mechanism for the coagulation process is considered.

ISSN:0008-4042    

DOI:10.1139/v53-009

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The condensation of 3-hydroxy-4-methylbenzoic acid with aqueous formaldehyde and hydrochloric acid yields the lactone of 6-hydroxymethyl-1,3-benzodioxane-8-methyl-5-carboxylic acid. This dioxanylphthalide has also been produced in a similar type of condensation from 5-hydroxy-4-methylphthalide which can be obtained by demethylation with aluminum chloride of 5-methoxy-4-methylphthalide.Proof of the presence of them-dioxane and phthalide rings in the condensation product has been obtained by opening these rings in succession. The action of alkaline permanganate opens the phthalide ring to yield a substituted phthalic acid. Acid hydrolysis then opens them-dioxane ring with loss of formaldehyde and the formation of a new phthalide ring. Successive steps of decarboxylation, methylation, and oxidation of the new phthalide yield the known 3-methyl-4-methylphthalic acid.

ISSN:0008-4042    

DOI:10.1139/v53-010

出版商:NRC Research Press    

年代:1953

数据来源: NRC