76671-72-2Relevant academic research and scientific papers
Sterically crowded heterocycles. XII. Atropisomerism of (1-aryl-3,5-diphenyl-1H-pyrrol-2-YL)(phenyl)methanones
Klvana, Robert,Pohl, Radek,Pawlas, Jan,Cejka, Jan,Dvorakova, Hana,Hrabal, Richard,Boehm, Stanislav,Kratochvil, Bohumil,Kuthan, Josef
, p. 651 - 666 (2007/10/03)
Some 1-(2-substituted phenyl)-and 1-(1-naphthyl)-2,4,6-triphenylpyridinium perchlorates were treated with potassium hexacyano ferrate(III)-potassium hydroxide reagent to give the title pyrroles. Restricted rotation around the C-N bond in the products is demonstrated by NMR experiments with homochiral shift reagents, by semiempirical PM3 calculations as well as using their atropodiastereoselective and enantioselective transformations. Racemisation barriers for the (R)-2-(N-methyl-N-phenylcarbamoyl) derivative were estimated from NMR and polarimetric measurements.
OXIDATION OF 1,2,3,4,6,-SUBSTITUTED PYRIDINIUM SALTS WITH FERRICYANIDE
Nesvadba, Petr,Kuthan, Josef
, p. 543 - 548 (2007/10/02)
Quaternary pyridiniun salts IIa-IId are oxidized with alkaline solution of potassium ferricyanide to give a mixture of pyrrole derivatives Ia-Ib and IVa-IVd.The quaternary salt IIeunder the same conditions affords a mixture of compouns IVe and V vhereas I
OXIDATION OF POLYSUBSTITUTED PYRIDINIUM SALTS
Nesvadba, Petr,Kuthan, Josef
, p. 1494 - 1502 (2007/10/02)
Oxidation of 1-substituted 2,4,6-triphenylpyridinium salts Ia-Ij with potassium ferricyanide in an alkaline medium was accompanied by contraction of the pyridine ring and formation of 1,2,3,5-tetrasubstituted pyrroles II.The derivative IIf underwent facil
Oxidation of 1-substituted 2,4,6-triphenylpyridinium salts
Nesvadba, Petr,Kuthan, Josef
, p. 3727 - 3728 (2007/10/02)
During the oxidation of 1,2,4,6-tetrasubstituted pyridinium salts 1 with potassium hexacyanoferrate(III) in alkali medium a contraction of pyridine ring is observed leading to 1,2,3,5-tetrasubstituted pyrroles 2.
