QUANTUM CHEMICAL INTERPRETATION OF ROTATIONAL ISOMERISM AND ELECTRONIC SPECTRA OF ALPHA-DIAZO KETONES

被引:36
作者
CSIZMADI.IG
HOULDEN, SA
MERESZ, O
YATES, P
机构
[1] Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, Toronto 5, Ont.
关键词
D O I
10.1016/S0040-4020(01)82763-0
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Application of Hoffmann's Extended Hückel MO method to diazoacetone and α-diazoacetophenone has been found to provide a quantum mechanical basis for previous postulations that α-diazo ketones can exist in two conformations. These are shown to be the cis and trans conformers for both diazoacetone and α-diazoacetophenone. It has been shown also that the electronic spectra of these α-diazo ketones, when resolved into Gaussian components, can be satisfactorily interpreted in terms of the energy levels calculated for each pair of conformers. © 1969.
引用
收藏
页码:2121 / +
页数:1
相关论文
共 25 条
[1]   BASIS OF EXTENDED HUCKEL FORMALISM [J].
BLYHOLDER, G ;
COULSON, CA .
THEORETICA CHIMICA ACTA, 1968, 10 (04) :316-+
[2]   UBER DAS AUFTRETEN ISOSBESTISCHER PUNKTE IN DEN UV-ABSORPTIONSSPEKTREN VON CARBONYL-DIAZO-VERBINDUNGEN [J].
FAHR, E .
CHEMISCHE BERICHTE-RECUEIL, 1959, 92 (02) :398-406
[3]  
HAMILTON GA, PRIVATE COMMUNICATIO
[4]   EXTENDED HUCKEL THEORY .4. CARBONIUM IONS [J].
HOFFMAN, R .
JOURNAL OF CHEMICAL PHYSICS, 1964, 40 (09) :2480-&
[5]  
HOFFMANN R, 1965, TETRAHEDRON LETT, P3819
[6]   AN EXTENDED HUCKEL THEORY .I. HYDROCARBONS [J].
HOFFMANN, R .
JOURNAL OF CHEMICAL PHYSICS, 1963, 39 (06) :1397-&
[7]   EXTENDED HUCKEL THEORY .6. EXCITED STATES AND PHOTOCHEMISTRY OF DIAZIRINES AND DIAZOMETHANES [J].
HOFFMANN, R .
TETRAHEDRON, 1966, 22 (02) :539-&
[8]   DEPENDENCE OF CONFORMATIONAL AND ISOMER STABILITY ON NUMBER OF ELECTRONS IN EXTENDED PI SYSTEMS [J].
HOFFMANN, R ;
OLOFSON, RA .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1966, 88 (05) :943-&
[9]   SELECTION RULES FOR CONCERTED CYCLOADDITION REACTIONS [J].
HOFFMANN, R ;
WOODWARD, RB .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1965, 87 (09) :2046-&
[10]   ORBITAL SYMMETRIES AND ORIENTATIONAL EFFECTS IN A SIGMATROPIC REACTION [J].
HOFFMANN, R ;
WOODWARD, RB .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1965, 87 (19) :4389-&