摘要:

In the homologous series ofp-chlorophenyl ω-chloroalkyl sulphides (I), the first and second members reacted abnormally with amines to yield 1, ω-bis(p-chlorophenylmercapto)alkanes (II). The fourth member of the series reacted normally to produce 4-aminobutylp-chlorophenyl sulphide (III). The formation of II is explained on the basis of an alkyl–sulphur bond cleavage. The members of thep-chlorobenzyl series (VI) in general reacted with amines to form the expected aminoalkyl sulphides (VII). However, thep-chlorobenzyl chloroalkyl sulphides (VI) were thermally labile and decomposed top-chlorobenzyl chloride and a sulphur component. A cyclic sulphur component originated from VI whose chloroalkyl carbon chain was 4, 5, or 6. The thermal degradation of VI is explained through a sulphonium salt cleavage

ISSN:0008-4042    

DOI:10.1139/v59-041

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The concentration dependence of some electronic absorption bands, which has previously been ascribed to intermolecular hydrogen bonding, is reinvestigated. The concentration dependences are compared for a number of substituted benzoic acids in inert solvents, and in solvent mixtures containing various amounts of ether. The results are discussed in terms of current theories of hydrogen bonding.

ISSN:0008-4042    

DOI:10.1139/v59-042

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The quenching of the resonance radiation of potassium by some unsaturated and saturated hydrocarbons has been examined at 67 °C. The behavior was found to be almost identical with that previously observed with sodium, the saturated hydrocarbons quenching to a negligible extent, the unsaturated hydrocarbons exhibiting cross sections with potassium not significantly different from those exhibited towards sodium.

ISSN:0008-4042    

DOI:10.1139/v59-043

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Bromination of 3α,12α-diacetoxypregnan-20-one ethylene ketal provided in good yield the corresponding 21-monobromo compound. This product, on acid hydrolysis and subsequent acetolysis, gave the known 3α,12α,21-triacetoxypregnan-20-one. Acid hydrolysis of the bromoketal, followed by Faworsky rearrangement, led to 3α,12α-diacetoxy-17α-methyletiocholanic acid methyl ester.

ISSN:0008-4042    

DOI:10.1139/v59-044

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Detailed X-ray analyses of the crystal structures of 9-nitroanthracene and 9,10-dinitro-anthracene have shown that the nitro groups are tilted out of the planes of the aromatic rings by 84.7° in the nitro derivative and 63.7° in the dinitro. The decreases in resonance interaction resulting from these deviations from coplanarity have been correlated with the characteristic vibration frequencies of the nitro groups.

ISSN:0008-4042    

DOI:10.1139/v59-045

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

4-O-β-D-Galactosyl-D-glucose (lactose) has been synthesized using a modification of the Koenigs–Knorr reaction.

ISSN:0008-4042    

DOI:10.1139/v59-046

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The infrared spectra of isopropylidene malonate and some of its derivatives have been examined and compared with those of open-chain malonate esters and of 5,5-dimethylcyclohexane-1,3-dione. Two bands in the carbonyl stretching region are attributed to vibrational coupling of the carbonyl groups in the cyclic esters. There is no evidence that isopropylidene malonate exists in the enolic form either in the solid state or in chloroform solution. This cyclic ester structure for "Meldrum's acid" is thus confirmed.

ISSN:0008-4042    

DOI:10.1139/v59-047

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

A series of dihalogenated and five tetrachloroazobenzenes were oxidized to the corresponding azoxy compounds by means of 30% hydrogen peroxide in glacial acetic acid, the reaction being carried out at about 60–70 °C, for 24 hoursAs expected, the yields, in general, obtained from azobenzenes containing substituents in the 2,2′-positions were lower than those from compounds having substituents in the 3,3′- and 4,4′-positions, which gave very good results.

ISSN:0008-4042    

DOI:10.1139/v59-048

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

A spectrophotometric procedure has been developed for microgram quantities of platinum utilizing an absorption peak at 310 mμ formed when platinum salts react with tin (II) chloride. The method offers a 5-fold increase in sensitivity over the conventional platinum – tin (II) chloride procedure. Several factors influencing the intensity and stability of the absorbing species, whose nature is unknown, are described. Palladium and rhodium produce gross interferences, but small quantities of iridium, iron, copper, and chromium can be tolerated. The procedure is applicable to fumed sulphuric acid solutions of platinum and to solutions of platinum in nitric acid. The recommended concentration range is 0.4 to 6 p.p.m. when measurements are made in 1.0- cm cells.

ISSN:0008-4042    

DOI:10.1139/v59-049

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Using a microcalorimeter of the Calvet type, measurements of the total heat of adsorption of water vapor on microcrystals of lead di-iodide have been made. By comparing the results obtained with those relating to the kinetic process of surface sintering by water vapor, heats for the process of sintering were calculated. The same sintering characteristics were found for preheated and unheated samples, but it was found that the heated product adsorbs more water than the original salt. Qualitative experiments on lead mono-iodide show a different pattern of heat evolution with time, and the over-all process requires more water to reach completion than in the case of di-iodide. The heats evolved are much greater, probably partly due to the reaction of water with the surface.

ISSN:0008-4042    

DOI:10.1139/v59-050

出版商:NRC Research Press    

年代:1959

数据来源: NRC