Sydnon‐äthylene. II. Elektronische Wechselwirkungen in 4‐Styryl‐sydnonen

Henning, Hans‐Georg; Neumann, Bernd‐Michael; Gloyna, D.; Sauer, Joachim

doi:10.1002/prac.19783200109

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…schen Photoreaktionen der 4-Styryl-sydnone ab. Allgemein gilt das Schema : [7]. Aus der relativ groaen Zahl der nachweisbaren Photoprodukte kann man auf eiiie gegeniiber der Gruppe B gesteigerten Reaktivitat der aus der Kohlendioxid-Eliniinierung hervorgehenden Diazirine bzw.…”

Section: Diskussionunclassified

Sydnon‐äthylene. III. Chemische Reaktionen elektronisch angeregter 4‐Styryl‐sydnone

Neumann¹,

Henning²,

Gloyna³

et al. 1978

J. Prakt. Chem.

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Sydnone Ethylenes. III. Chemical Reactions of Excited 4‐Styryl‐sydnones Dependent on the character of the substituents in the photo reactions of 4‐styryl sydnones Z/E‐isomerism competes with CO2‐elimination. Excited p‐nitrostyryl sydnones exhibit a relatively strong degradation of the bond order in the CC region. Their quantum yields of Z/E‐isomerism are therefore much higher than those of compounds with p‐substituents of lower acceptor effect. In these compounds the cleavage of the sydnone ring with elimination of carbon dioxide is favoured especially if a methyl group is in 3‐position of the sydnone.

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Section: Diskussionunclassified

Sydnon‐äthylene. III. Chemische Reaktionen elektronisch angeregter 4‐Styryl‐sydnone

Neumann¹,

Henning²,

Gloyna³

et al. 1978

J. Prakt. Chem.

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Mesoinische Sechsringheterocyclen, I. Synthese von 6‐Oxo‐6H‐1,3‐oxazin‐3‐ium‐4‐olaten

Friedrichsen

Kujath

Liebezeit

et al. 1978

Justus Liebigs Ann. Chem.

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Es wird die Synthese von 6-0~0-6H-1,3-oxazin-3-ium-4-olaten (7) aus sekundaren Saureamiden und Malonyldichloriden beschrieben. Aufgrund von Solvolyseexperimenten ist anzunehmen, daR eine signifikante Delokalisierung der positiven Partialladung an C-2 nicht erfolgt; [CND0/2]-Rechnungen stiitzen diese Ansicht. Mesoionic Six-membered Heterocycles, I. -Synthesis of 6-0xo-6H-1,3-oxazin-3-ium-4-olatesThe synthesis of 6-0~0-6H-l,3-oxazin-3-ium-4-olates (7) from secondary amides and malonyl dichlorides is described. It is deduced from solvolysis experiments that there is not any significant delocalisation of the positive partial charge at C-2; CND0/2 calculations are in agreement with this assumption.

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Photochemie von Aminoketonen. III. Struktur und photochemisches Verhalten von β‐Aminovinyl‐phenyl‐ketonen in Lösungsmitteln unterschiedlicher Polarität

et al. 1978

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Photochemistry of Aminoketones. III. Structures and Photochemical Behaviour of β‐Aminovinyl‐phenyl‐ketones in Solvents of Different Polarity Spectroscopic data of ten selected β‐aminovinyl‐phenyl ketones PhCOCHCR1NR2R3 in polar and nonpolar solutions, respectively, are discussed and the structures assigned. The apparent photochemical inertness of these compounds in alcoholic solution and the irreversible reactions of some enaminoketones in nonpolar medium are explained in terms of relations between the compounds and the polarity of the solvent.

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Sydnon‐äthylene. II. Elektronische Wechselwirkungen in 4‐Styryl‐sydnonen

Cited by 6 publications

References 15 publications

Sydnon‐äthylene. III. Chemische Reaktionen elektronisch angeregter 4‐Styryl‐sydnone

Sydnon‐äthylene. III. Chemische Reaktionen elektronisch angeregter 4‐Styryl‐sydnone

Mesoinische Sechsringheterocyclen, I. Synthese von 6‐Oxo‐6H‐1,3‐oxazin‐3‐ium‐4‐olaten

Photochemie von Aminoketonen. III. Struktur und photochemisches Verhalten von β‐Aminovinyl‐phenyl‐ketonen in Lösungsmitteln unterschiedlicher Polarität

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