Results 161 to 170 of about 132,796 (171)

Fluorinated heterocyclic compounds. An effective strategy for the synthesis of fluorinated Z-oximes of 3-perfluoroalkyl-6-phenyl-2h-1,2,4-triazin-5-ones via a ring-enlargement reaction of 3-benzoyl-5-perfluoroalkyl-1,2,4-oxadiazoles and hydrazine.

Journal of Organic Chemistry, 2005
The reaction of 3-benzoyl-5-perfluoroalkyl-1,2,4-oxadiazoles with hydrazine has been investigated, evidencing the possibility of competitive reaction paths.
S. Buscemi, A. Pace, Antonio Palumbo Piccionello, G. Macaluso, N. Vivona, D. Spinelli, G. Giorgi   +6 more
semanticscholar   +1 more source

UTILITY OF 1-(2,4-DIMETHOXYPHENYL)-3-ARYL-PROP-2-ENE-1-ONES AS RING TRANSFORMER IN PREPARING HETEROCYCLIC COMPOUNDS AND THEIR POTENTIAL BIOLOGICAL ACTIVITIES

, 2004
As an effort to synthesize new heterocyclic compounds, which would be expected to have a pharmacological and biological activities, we report here the reactivity of 1-(2,4-dimethoxyphenyl)-3-aryl-2-propen-1-ones (Ia&b), as Michael acceptors under ...
M. A. Salem, E. A. Soliman, Michael B. Smith, M. R. Mahmoud, M. E. Azab   +4 more
semanticscholar   +1 more source

Fluorinated Heterocyclic Compounds − The First Example of an Irreversible Ring-Degenerate Rearrangement on Five-Membered Heterocycles by Attack of an External Bidentate Nucleophile

, 2004
The reactions of 5-perfluoroalkyl-1,2,4-oxadiazoles 3 with hydroxylamine in DMF give the regioisomeric 3-perfluoroalkyl-1,2,4-oxadiazoles 4 in excellent yields.
S. Buscemi, A. Pace, I. Pibiri, N. Vivona, Camilla Zaira Lanza, D. Spinelli   +5 more
semanticscholar   +1 more source

Reactivity of Donor-Acceptor Cyclopropanes with Saturated and Unsaturated Heterocyclic Compounds

, 2016
Strain in the ring engenders versatile reactivity that can be utilized for the synthesis of complex molecules by the assimilation of suitable substituents.
A. Pandey, Asit Ghosh, Prabal Banerjee
semanticscholar   +1 more source

Ring transformations of heterocyclic compounds. XI. 2,4,6‐triarylphenylquinolinium salts from methyl substituted derivatives via (thio)pyrylium ring transformations

, 1995
The preparation of hitherto unknown 2,4,6-triarylphenyl substituted quinolinium perchlorates 3 from methylquinolinium derivatives 2 by a 2,6-[C5+C] ring transformation of 2,4,6-triaryl(thio)pyrylium salts 1/4 in the presence of triethylamine/acetic acid ...
T. Zimmermann
semanticscholar   +1 more source

Ring transformations of heterocyclic compounds. X. A simple method for the conversion of methyl substituted pyridinium salts into 2,4,6‐triarylphenyl derivatives: The first (thio)pyrylium ring transformations with heterocyclic anhydrobases as carbon nucleophiles

, 1995
The synthesis of 2,4,6-triarylphenylpyridinium perchlorates 3 from methyl substituted derivatives 2 by a 2,6-[C5+C] ring transformation of 2,4,6-triaryl(thio)pyrylium salts 1/4 in the presence of triethylamine/acetic acid in ethanol is reported ...
T. Zimmermann
semanticscholar   +1 more source

Synthesis and Evaluation of Novel Cholestanoheterocyclic Steroids as Anticancer Agents

Applied Biochemistry and Biotechnology, 2019
D. El-Kady, Ahmed A. Abd Rabou, M. Tantawy, A. Abdel-Rahman, A. Abdel‐Megeed, M. Abdelhalim, G. Elmegeed   +6 more
semanticscholar   +1 more source

DFT and ab initio study on non-linear optical (NLO) properties of some organic complexes with different conjugate linker and substituent groups

, 2012
Guo-dong Tang, Jianying Zhao, Zhengjin Jiang, Shanshan Kou, X. Ju, Changmei Wei   +5 more
semanticscholar   +1 more source

Photochemical transformations of small ring heterocyclic compounds. XLII. Photochemical reorganizations in the 1,3-diazabicyclo[3.1.0]hex-3-ene system

, 1972
A. Padwa, E. Glazer
semanticscholar   +1 more source

Photochemical transformations of small-ring heterocyclic compounds. XXIV. Photoisomerization of the triphenyl-1,3-diazabicyclo[3.1.0]hex-3-ene system

, 1970
A. Padwa, S. Clough, E. Glazer
semanticscholar   +1 more source