Results 241 to 250 of about 18,411 (287)

A new synthesis of pyrroles

Chem. Commun., 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Quiclet-Sire, Béatrice, Wendeborn, Frédérique, Zard, Samir, Z.   +2 more
openaire   +3 more sources

The System Pyridine-Pyrrole and the Association of Pyrrole

The Journal of Chemical Physics, 1955
Pyridine and pyrrole react together to form a 1:1 complex as shown by infrared, heat of reaction, viscosity, refractive index, and density data. The heat of formation of this complex is 3.8 kcal/mole. Pyrrole itself is associated, but, like the simple alcohols, cannot be represented by a simple equilibrium.
Serge N. Vinogradov, Robert H. Linnell
openaire   +1 more source

The Synthesis of 3-Substituted Pyrroles from Pyrrole

Synthesis, 1985
La reaction d'electrophiles avec le pyrrole se fait preferentiellement en position 1 ou 2; pour obtenir des derives substitues en 3, on protege d'abord la position 1 ou 2 par des substituants orientant la reaction en position 3 ou on utilise en position 2 des substituants permettant un rearrangement conduisant aux pyrroles substituees en 3; une etape ...
Hugh J. Anderson, Charles E. Loader
openaire   +1 more source

Oxidative Copolymerization of Pyrrole and N-Methyl Pyrrole

International Journal of Polymer Analysis and Characterization, 2003
Pyrrole and N-methyl pyrrole were copolymerized by ceric ammonium nitrate (CAN) in aqueous solution.
Belkis Ustamehmetoğlu, Eda Kelleboz, A. Sezai Sara¸   +2 more
openaire   +1 more source

Synthesis of pyrrole urea and pyrrole carbonylurea derivatives

Tetrahedron, 2009
Abstract A series of urea and carbonylurea distamycin analogs whereby the linker has two NH groups for hydrogen bonding with base pairs of DNA were synthesized. The urea and carbonylurea derivatives are prepared from the in situ generation of pyrrole isocyanate (prepared from compound 3 ) and acyl isocyanate (compound 9 ), followed by the reaction ...
Meng-Chi Liu, Chi Wi Ong
openaire   +1 more source

Synthesis of pyrrole and substituted pyrroles (Review)

2017
Pyrrole is widely known as a biologically active scaffold which possesses a diverse nature of activities. The combination of different pharmacophores in a pyrrole ring system has led to the formation of more active compounds. Pyrrole containing analogs are considered as a potential source of biologically active compounds that contains a significant set
Tzankova D., Vladimirova S., Peikova L., Georgieva M.   +3 more
openaire   +1 more source

Pyrrole chemistry. XXVII. 2,3,4-Trisubstituted pyrroles and a second synthesis of porphobilinogen from pyrrole

Canadian Journal of Chemistry, 1984
Changes in some of the key intermediates and procedures used in our earlier total synthesis of porphobilinogen from pyrrole that improve the yield to 11% are reported. Ethyl pyrrole-3-acetate was formylated by the Vilsmeier–Haack method and then iodinated.
Kurt Faber, Hugh J. Anderson, Charles E. Loader, Annette S. Daley   +3 more
openaire   +1 more source

An efficient synthesis of highly substituted pyrrole and bis pyrrole derivatives

Journal of Heterocyclic Chemistry, 2007
Abstractmagnified imageAn efficient synthesis of highly substituted pyrrole and bis pyrrole derivatives is reported.
Rajeshwar Reddy Sagyam, Himabindu Vurimidi, Pratap Reddy Padi, Mahesh Reddy Ghanta   +3 more
openaire   +1 more source

Pyrrole Pigments

Annual Review of Biochemistry, 1950
R, LEMBERG, J W, LEGGE
openaire   +2 more sources

Bis–Calix[4]pyrroles: Preparation, structure, complexation properties and beyond

Coordination Chemistry Reviews, 2020
Jonathan Sessler, Tian Zhao, Qing He
exaly