摘要:

The ultraviolet spectra, basic strengths, and N-alkyl groups of the aconite alkaloids are discussed. Pyropseudaconine has been shown to contain a conjugated system. The formulation C19H19–2,(OH)3,(OCH3)4NC2H5has been confirmed for lycoctonine. Study of its oxidation products has shown that lycoctonine has a methylene group adjacent to the nitrogen and a primary hydroxyl group. The two remaining hydroxyls have been shown to be vicinal, with one probably secondary and the other tertiary. A carbinolamine structure is suggested for hydroxylycoctonine. The new bases, isolycoctonine, desoxylycoctonine, and des-(oxymethylene)-lycoctonine are described.

ISSN:0008-4042    

DOI:10.1139/v52-075

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

By passing appropriate dichloroalkanes, e.g. 1,1-dichloroethane, over a mixture of silicon and copper at elevated temperature, the new compounds 1,1-bis-trichlorosilylethane, 1,2-bis-trichlorosilylpropane, and 1,4-bis-trichlorosilylbutane and the previously reportedbis-trichlorosilylmethane, dichlorosilyltrichlorosilylmethane, and 1,2-bis-trichlorosilylethane were synthesized. Trichloromethane yielded perchlorodisilane; 2-chloropropane gave propene.By causing the chlorosilylalkanes to react with lithium aluminum hydride, disilylmethane, 1,1-disilylethane, 1,2-disilylethane, and 1,2-disilylpropane were synthesized.Several physical constants of the compounds were measured.

ISSN:0008-4042    

DOI:10.1139/v52-076

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Any pair of the group of 11 phosphate esters studied may be separated on a paper chromatogram with one of three solvent mixtures: ethyl acetate – acetic acid – water, methyl Cellosolve – methyl ethyl ketone – ammonia water, ethyl acetate – formamide – pyridine. Separation of the components of more complex mixtures usually requires the use of two-dimensional paper chromatography. Position constants for the individual esters with each of the three solvents are listed, and diagrams showing the type of separation pattern obtained by two-dimensional chromatography of mixtures are presented.

ISSN:0008-4042    

DOI:10.1139/v52-077

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Titanium in steels and nickel-base alloys can conveniently be determined polarographically after electrolysis of a solution of the alloy in a mercury-cathode cell. A well-formed wave, the height of which is directly proportional to the concentration of titanium in the solution, is recorded using a supporting electrolyte that is 1.0 Min tartaric acid, 0.5 Min sulphuric acid, and 1.2 Min ammonium sulphate.The method is one of good precision and yields values in excellent agreement with those given by umpire methods for samples of basic open-hearth steel, 18-11 chromium-nickel steel, Monel, Inconel "W", and Nimonic 75 and 80.

ISSN:0008-4042    

DOI:10.1139/v52-078

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Mildly acid sodium chlorite solutions were allowed to act on white birch and black spruce sawdust at room temperature for various times; the insoluble fraction and the soluble nondialyzable fraction were isolated and weighed. If chlorite acts selectively on lignin the sum of these two fractions in time approaches true holocellulose. Chlorine and methoxyl determinations and examination of the ultraviolet absorption spectra showed that this was only approximately true. A small amount of carbohydrates was probably lost, and evidence was found for the existence of a chlorite-resistant lignin fragment in the soluble nondialyzable fraction.

ISSN:0008-4042    

DOI:10.1139/v52-079

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Thecis-transisomerizations of azoxybenzene,p,p′-azoxytoluene, andp-chloro-benzenediazocyanide have been investigated in a variety of solvents. While linear relations between logkandwere found to exist for reactions of the azoxy compounds in solvents of internal pressure greater than nine, no such correlation was found for the diazocyanide. Linear relations have been observed between the logarithms of the rate constants for isomerization of azobenzene, azoxybenzene, andp,p′-azoxytoluene in a series of solvents.

ISSN:0008-4042    

DOI:10.1139/v52-080

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Rate curves have been determined for the reaction of ammonium nitrate with formaldehyde in glacial acetic acid solution at 25 °C., 35 °C., 45 °C., and 55 °C. over a range of Initial mole ratios (formaldehyde: ammonia) of 0.75:1 to 9.0:1. Data obtained at 25 °C. show a definite induction period in the formation of hexamine. The length of the induction period is not changed by increasing ammonium nitrate concentrations above the theoretical (1.5:1), but may be appreciably shortened by initial additions of excess formaldehyde or of sodium acetate. From 35 °C. upward, the induction period is not apparent. The order of the reaction with respect to formaldehyde has been determined from initial rate data, and an activation energy calculated. The reactions in general appear analogous to those found in slightly acid aqueous systems.

ISSN:0008-4042    

DOI:10.1139/v52-081

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

When TiI4is passed over a hot bar of Ti metal, the reactions observed depend on whether the temperature of the bar is above or below 1100 °C. If the temperature is below 1100 °C., Ti is rapidly etched from the bar to form TiI2, which through further reaction with TiI4is converted to TiI3. A mixture of TiI2and TiI3can be recovered from the reaction vessel. The proportions in the mixture depend on the temperature, since TiI3is appreciably more volatile than TiI2. At bar temperatures above 1100 °C., TiI4is decomposed to Ti and I2. No evidence of intermediates in the decomposition has been obtained. By replacing the titanium bar with a tungsten one, the etching and deposition reactions of Ti have been separated. Estimates of activation energies for these reactions have been made.

ISSN:0008-4042    

DOI:10.1139/v52-082

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The structure of a polyuronide hemicellulose from wheat straw containing xylose, arabinose, and hexuronic acid units has been investigated. Graded hydrolysis preferentially removed anhydro-L-arabinose units leaving a xylan to which uronic acid units were attached. Methylation and hydrolysis yielded 2,3,4-trimetliyl xylose (2.7%) indicating one nonreducing end group per 37 units; 2,3,5-trimethyl-L-arabinose, 2,3-dimethyl-D-xylose, and 2-methyl-D-xylose were found in a molar ratio 1:5:1. In addition, a methylated uronic acid complex was recovered which on extensive hydrolysis yielded an aldobiuronic acid. The latter, on reduction with sodium borohydride, yielded 2,3,4-trimethyl glucose (1 mole) and 2-methyl xylose (1 mole); the structure 2-methyl 3[2,3,4-trimethyl α-D-glucuronosido]D-xylose was therefore indicated for the methylated aldobiuronic acid.A structure for the hemicellulose is proposed which consists of approximately 32 anhydro-D-xylose units linked β 1,4- in a chain to which five anhydro-L-arabinose and threeD-glucuronic acid units are attached as side groups by 1,3-glycosidic bonds. Results of periodate oxidation and estimation of reducing power support the proposed structure.

ISSN:0008-4042    

DOI:10.1139/v52-083

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

7H-Pyrido(2,3-c)- (IX, R=H) and 7H-pyrido(3,2-c)carbazole (V, R=H) have been synthesized by unambiguous routes and shown to be identical with the products resulting from the Fischer-indole ring closure followed by dehydro-genation of 6- and 7-quinolylhydrazone of cyclohexanone respectively. The cyclization of N-substituted-1,2,3,4-tetrahydro-6- and -7-quinolylhydrazone of cyclohexanone followed by hydrolysis and dehydrogenation resulted in the linear polycyclic systems, 6H-pyrido(3,2-b)- (VIII) and 10H-pyrido(2,3-b)carbazole (IV) respectively. The 12 possible pyridocarbazoles have now been prepared.The structure of the Skraup reaction product of 1-phenyl-5-amino-1-benzo-triazole (X) has been established.

ISSN:0008-4042    

DOI:10.1139/v52-084

出版商:NRC Research Press    

年代:1952

数据来源: NRC