Results 111 to 120 of about 167 (149)

Photochemical δ-hydrogen abstraction from acyclic and semicyclic monothioimides

J. Chem. Soc., Perkin Trans. 1, 1991
Photochemical δ-hydrogen abstraction from acyclic and semicyclic monothioimides have been studied. Photolysis of acyclic monothioimides possessing a benzylic hydrogen atom at the δ-position gave γ-lactams, via a 1,5-diradical intermediate, accompanied by thioamides were generated by γ-hydrogen abstraction.
Masami Sakamoto, Masakazu Tohnishi, Tsutomu Fujita, Shoji Watanabe   +3 more
openaire   +1 more source

Direction of heterocyclization in the interaction of semicyclic 1,5-diketones with bifunctional nucleophiles

Chemistry of Heterocyclic Compounds, 1984
In the interaction of a series of 1-aryl-3-R-3-(2′-oxo-cycloalkyl)-1-propanones with o-aminophenol and o-phenylenediamine, depending on the structure of the reacting compounds, derivatives of 1,9a-tetra(tri)-methylene-9-oxa(aza)-4a-aza-1,2,4a,9a-tet-rahydrofluorene are formed.
L. N. Donchak, A. N. Saverchenko, V. A. Kaminskii, M. N. Tilichenko   +3 more
openaire   +1 more source

ChemInform Abstract: DIRECTION OF HETEROCYCLIZATION IN THE REACTION OF SEMICYCLIC 1,5‐DIKETONES WITH BIFUNCTIONAL NUCLEOPHILES

Chemischer Informationsdienst, 1985
AbstractDie Umsetzung der 1,5‐Diketone (I) mit o‐Aminophenol und o‐Phenylendiamin (II) erfolgt abhängig von der Art der Aroyl‐ substituenten und dem Nucieophjl zu den Cyclisierungsprodukten (III) und/oder (IV).
L. N. DONCHAK, A. N. SAVERCHENKO, V. A. KAMINSKII, M. N. TILICHENKO   +3 more
openaire   +1 more source

(ω-Ammonioalkyl)cyclopentadienides by Rhodium-Catalyzed Vinylcarbene Transfer to Semicyclic Enaminocarbonyl Compounds

Organic Letters, 1999
The rhodium(II)-catalyzed reaction of vinyldiazoacetate 2 with semicyclic β-enaminocarbonyl compounds 1 provides (ω-(methylammonio)alkyl)cyclopentadienides 3. This transformation represents a novel reaction cascade which combines carbenoid addition at a CC bond with ring-chain transformation.
Gerhard Maas, Andreas Müller
openaire   +1 more source

ChemInform Abstract: Careful Introduction of the Nitrile Group into a Semicyclic Enamine Structure.

ChemInform, 1988
AbstractReaction of the piperidinyl‐dihydropyridines (I) with the acylisothiocyanate (II), formed in situ from benzoylchloride and KSCN, with Na‐alcoholates (or NaOH) gives the cyanomethylene compounds (IV) instead of the expected cyclization products.
F. PRAGST, J. LIEBSCHER, B. ROLOFF, E. BOCHE   +3 more
openaire   +1 more source

E/Z-Isomerism of semicyclic amidinium salts

Magnetic Resonance in Chemistry, 1999
Hartmann, Susanne, Brecht, Volker, Frahm, August Wilhelm   +2 more
openaire   +1 more source

The Rule of Semicycle and Global Asymptotic Stability for a Fourth-Order Rational Difference Equation

Computers and Mathematics With Applications, 2005
Deming Zhu
exaly  

4.2.11 Semicyclic allyl radicals

2005
openaire   +1 more source

Centralizers of finite semicyclic transformation monoids

Commentarii mathematici Universitatis Sancti Pauli = Rikkyo Daigaku sugaku zasshi, 1983
openaire   +2 more sources

Linear Difference Equations Mod 2 With Applications to Nonlinear Difference equations1

Journal of Difference Equations and Applications, 2008
Stevo Stević, Lothar Berg
exaly