130274-66-7Relevant articles and documents
Intermolecularly hydrogen-bonded dimeric helices: tripyrrindiones
Roth, Steven D.,Shkindel, Tetyana,Lightner, David A.
, p. 11030 - 11039 (2007)
A rare and unusual class of tripyrrolic compounds, violet-colored tripyrrin-1,14-diones, can be prepared easily and in moderately high yields from base (piperidine)-catalyzed condensation of 3-pyrrolin-2-ones with 2,5-diformylpyrroles. Dipyrrinones adopt the all-syn-Z conformation leading to helical, lock-washer like structures, which form dimers that are held together by intermolecular hydrogen bonds in nonpolar solvents and in the crystal. Strong bathochromic spectral shifts of the tripyrrindione ~480 nm long wavelength UV-visible absorption band are seen with added base: DBU, 615 nm; TFA, 573 nm; and Zn(OAc)2, 586 nm.
New one-step synthesis of 3,4-disubstituted pyrrole-2,5-dicarbaldehydes
Tardieux, Catherine,Bolze, Frederic,Gros, Claude P.,Guilard, Roger
, p. 267 - 268 (1998)
A smooth and convenient one-step synthesis of 3,4-disubstituted pyrrole- 2,5-dicarbaldehydes 2 is reported. This reaction involves the condensation of β-substituted pyrrole-2-carboxylic acids with triethyl orthoformate in trifluoroacetic acid to give the title compounds in good yield.
Die Porphyrin-Homologen: Porphyrin(2.2.2.2), ein "gestrecktes Porphycen"
Vogel, Emanuel,Jux, Norbert,Rodriguez-Val, Eduardo,Lex, Johann,Schmickler, Hans
, p. 1431 - 1434 (2007/10/02)
-