摘要:

The vapor-phase reaction over activated alumina of tetrahydropyran with aniline and the toluidines has been investigated. Under optimum conditions, N-arylpiperidines were obtained in over 90% yield from aniline,m-toluidine, andp-toluidine. The cyclic ether ando-toluidine gave N-o-tolylpiperidine in a maximum yield of 66%. N-Phenylpyrrolidine was obtained in 88% yield from tetrahydrofuran and aniline as compared to 45.5% previously reported by Yur'ev.

ISSN:0008-4042    

DOI:10.1139/v52-001

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Evidence concerning the forms of phosphorus-32 occurring in neutron-bombarded calcium phosphates has been obtained using carrier ions for the different forms, and estimations of the proportional amounts present in these forms have been made. Ortho-, hypo-, pyro-, and metaphosphate forms of phosphorus-32 have been found as activity in the precipitation of the respective carriers; hypophosphate appeared to be an invariable and major component.

ISSN:0008-4042    

DOI:10.1139/v52-002

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The absolute value of the yield of ferric ion on the irradiation of ferrous sulphate in 0.80  Nsulphuric acid by γ-rays has been determined using the Bragg–Gray cavity principle. Sources of error in the measurements were reduced as much as possible. The yield obtained, 20.8 ± 0.3 ferric ions per 100 ev. absorbed, agrees well with Miller's value of 20.7 molecules per 100 ev.

ISSN:0008-4042    

DOI:10.1139/v52-003

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The yield of cerous ions formed in the reduction of ceric ion in sulphuric acid solutions by X and γ-radiation is independent of cerous and ceric ion concentration, the energy of the radiation, the rate of energy absorption over a wide range, the acid concentration, and the presence of oxygen. A small negative temperature coefficient has been observed. The over-all stoichiometric equation isHydroxyl radicals postulated to be produced by the radiation form water and oxygen gas. The lower limit of concentration independence is below 2 × 10−6 moles per liter.

ISSN:0008-4042    

DOI:10.1139/v52-004

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The oxidation of ferrous ion and the reduction of ceric ion in 0.80  Nsulphuric acid by electrons from dissolved P32and S35have been studied. The chemical yields (chemical change per unit energy absorbed) obtained agree well with those obtained using X or γ-radiation. The yield is independent of electron energy above about 5 kev. The results show that chemical dosimetry methods may be used for the accurate determination of energy absorption for electron energies as low as 45 kev. or X rays of 200 kev.

ISSN:0008-4042    

DOI:10.1139/v52-005

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

A molecular orbital study of 2,3-dinaphthylene is reported, the molecule being assumed to have a planar structure. The magnitude of the resonance energy shows that the interaction of the π electrons as a whole is quite strongly stabilizing. The bond orders have been computed and from these the lengths of the bonds in the molecule have been deduced. The longest wave length in an allowed excitation probably arises from a transition between mobile electron levels of symmetryA1g → B1uand polarized in the direction of the long axis of the molecule.

ISSN:0008-4042    

DOI:10.1139/v52-006

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

4-Mono- and 4,4-disubstituted-3-imino-2-benzoyl-5-pyrazolones have been prepared from the corresponding ethyl mono- or disubstituted cyanoacetates and N-benzoylhydrazine. The presence of the imino group in 4,4-disubstituted-3-imino-2-benzoyl-5-pyrazolones was ascertained by the hydrolysis of 4,4-dibenzyl-3-imino-2-benzoyl-5-pyrazolone into 4,4-dibenzyl-3-oxo-2-benzoyl-5-pyrazolone. In order to prove that the benzoyl group in these pyrazolones was not in Position 1, the synthesis of 4-benzyl-3-amino-1-benzoyl-5-pyrazolone was attempted from 4-benzyl-3-carbethoxy-1-benzoyl-5-pyrazolone through a Curtius degradation of the 3-carbethoxy substituent into a 3-amino group. It was found that the 1-benzoyl group was hydrolyzed at the same time as the 3-carbethoxyamino substituent. The ultraviolet absorption spectra of all these compounds are reported and discussed briefly.

ISSN:0008-4042    

DOI:10.1139/v52-007

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Although azo-bis-formamidine dinitrate cannot be converted to the dinitro derivative directly it can be chlorinated in water to azo-bis-chloroformamidine and thence to azo-bis-nitroformamidine in nitric acid and acetic anhydride. When the latter substance is treated with 2-methylpentadiene-1,3 an alkali-soluble compound is obtained which is specified as 1-imino-3-nitrimino-4,6(or 5,7)-dimethyl-2,8,9-triaza-4,6,8,9-tetrahydroindandione-1,3. The characteristics of this reaction indicate that azo-bis-nitroformamidine exists as the nitrimino tautomer. The Diels-Alder reaction with 2-methylpentadiene-1,3 has its counterpart in the similar reaction whereby azo-bis-formamidine is converted to 1,3-diimino-4,6-dimethyl-2,8,9-triaza-4,6,8,9-tetrahydroindandione-1,3mononitrateand ammonium nitrate. The entire sequence of reactions is offered as evidence that the imino group in guanidines is the site of nitration, and its chemistry of nitration is analogous with that of aliphatic secondary amines.

ISSN:0008-4042    

DOI:10.1139/v52-008

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-009

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-010

出版商:NRC Research Press    

年代:1952

数据来源: NRC