摘要:

Proton magnetic resonance spectra of 1,4-dibromobenzene (13C and12C) partially oriented in nematic phases have been measured and analyzed, and the geometry of the molecule has been determined. The angleis found to be 120.02 ± 0.01° and the anglewith the assumption that all CC bond distances are of equal length the angleTheJCHare determined using three spectra of samples with differing degrees of orientation.

ISSN:0008-4042    

DOI:10.1139/v74-533

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

Reaction of propiolate esters, H—C≡C—CO2R, with tertiary alkylamines R′3N in highly aqueous media yields betaines of the typetransR′3N+•CH=CH•CO2−. The spectral and chemical properties of these derivatives are discussed as well as the mechanism of their formation. The major by-product of reaction is the correspondingtrans-3-alkoxyacrylate RO—CH=CH—CO2R.

ISSN:0008-4042    

DOI:10.1139/v74-534

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

Synthetic methods for the preparation of phenanthrene-1,3-d2, -2,4-d2, -1,2,3,4-d4, -1,3,6,8-d4, and -2,4,5,7-d4are described.

ISSN:0008-4042    

DOI:10.1139/v74-535

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

The computer analysis (LAOCN-3 program) of the p.m.r. spectrum of 5-oxabenzocycloheptene (3) at −105° has provided values for all coupling constants about the C3—C4bond, while the complete line-shape simulation (DNMR program) has provided the following activation parameters: ΔG≠ = 9.5 kcal/mol (at −57°), ΔH≠ = 9.9 kcal/mol, and ΔS≠ = 1.5 e.u. A novel long distance (transannular) deuterium isotope effect has been discovered during the analysis of the spectrum of a partially deuterated derivative of3. A comparison of the p.m.r. parameters for 5-oxabenzocycloheptene and benzocycloheptene provides the basic data from which stereochemical and conformational inferences can be made for more complex derivatives in this series.

ISSN:0008-4042    

DOI:10.1139/v74-536

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

During the photolysis of aqueous H2O2added β-ammonio alcohols suffer oxidative attack initiated through hydrogen abstraction by the•OH radical. At pH7.0 the initially formed radical,undergoes fragmentation to yieldand CH3COR′ exclusively. At pH1.0 fragmentation is less important and direct oxidation todominates. A radical deprotonation step is proposed to account for the pHdependence.

ISSN:0008-4042    

DOI:10.1139/v74-537

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

2,4-Dinitrophenylselenium trichloride has been found to add tocis- andtrans-1-phenylpropene in anantistereospecific manner to yieldthreo-dl-anderythro-dl-β-chloroalkyl 2,4-dinitrophenyl selenide dichlorides, respectively. Comparison is made with the adducts from the addition of 2,4-dinitrobenzeneselenenyl chlorides. β-Chloroalkyl 2,4-dinitrophenyl selenides react with chlorine or sulfuryl chloride to yield β-chloroalkyl 2,4-dinitrophenyl selenide dichlorides. β-Chloroalkyl selenide dichlorides were observed to decompose into 1,2-dichloro adducts and areneselenenyl chloride. 2,4-Dinitrobenzeneselenenyl acetate was shown to add to alkenes in anantistereospecific manner.

ISSN:0008-4042    

DOI:10.1139/v74-538

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

Compounds of the type [CuA2•H2O]2and [CuA2•4H2O]2have been prepared, where A isN-acetylglycine (aceturic acid). Amine adducts of the type CuA2B (B = piperazine, 2,2′-bipyridine, and 1,10-phenantroline) and CuA2B2(B = N-methylpiperazine, piperidine, morpholine, pyridine, and ethylenediamine) were obtained by reaction of the amines with CuA2•4H2O. Each complex was characterized by elemental analysis, infrared spectrum, electronic spectrum, and magnetic moment. For the piperazine and ethylenediamine adducts a square-planar pattern of coordination about copper(II) ion is probable, while for the other amine adducts a square-pyramidal structure is proposed. For all the complexes the coordination of theN-acetylglycine occurs only through the terminal carboxyl oxygen in a monodentate arrangement.

ISSN:0008-4042    

DOI:10.1139/v74-539

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

Infrared measurements show that fluorocarbons containing higher halogens are able to open O—H---O, N—H---N, S—H---S, N—H---O=C, type hydrogen bonds. This is probably due to a competitive mechanism of association consisting in the formation of donor–acceptor complexes. It is suggested that the breaking or perturbation of hydrogen bonds by this mechanism is of importance for the explanation of the anesthetic activity of these compounds.

ISSN:0008-4042    

DOI:10.1139/v74-540

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

A new metabolite, isolated from cultures of aCryptosporiopsissp., is shown to be (1R,5S)-2-cyclopentene-1-carboxylic acid, 2-trans-allyl-3-chloro-1,5-dihydroxy-4-oxo methyl ester.

ISSN:0008-4042    

DOI:10.1139/v74-541

出版商:NRC Research Press    

年代:1974

数据来源: NRC

摘要:

The condensation of acetaldehyde and malononitrile is reported to yield 1,1,3,3-tetracyano-2,4-dimethylcyclobutane. The n.m.r. spectrum of this material and several of its derivatives, however, was found to best fit the title compound. A reaction scheme for the formation of the title compound is suggested.

ISSN:0008-4042    

DOI:10.1139/v74-542

出版商:NRC Research Press    

年代:1974

数据来源: NRC