Reference

[22]Porphyrin-(3

All Rights Reserved. [22]Porphyrin-(3.1.1.3), a New Vinylogous Expanded Porphyrin System. Xu, Linlin; Ferrence, Gregory M.; Lash, Timothy D.Several reagents such as 927-63-9 is used here. (Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA). Organic Letters, 8(22), 5113-5116 (English) 2006 American Chemical Society. CODEN: ORLEF7. ISSN: 1523-7060. DOCUMENT TYPE: Journal CA Section: 26 (Biomolecules and Their Synthetic Analogs) Section cross-reference(s): 75, 78 Acid-catalyzed condensation of a pyrrole bisacrylaldehyde with a tripyrrane, followed by oxidn. with ferric chloride, gave a [22]porphyrin-(3.1.1.3) (I). This stretched macrocycle shows a strong diamagnetic ring current by 1H NMR spectroscopy and gives red-shifted porphyrin-like UV-vis spectra; coordination with palladium(II) induces an EZ isomerization to accommodate the metal cation while retaining highly diatropic characteristics. .

Pyrrole studies

Pyrrole studies. Part 36. The synthesis of 2,2'-bipyrroles and related compounds. Hinz, Werner; Jones, R. Alan; Patel, Sunil U.; Karatza, Mary Helen (Sch. Chem. Sci., Univ. East Anglia, Norwich NR4 7TJ, UK). Tetrahedron, 42(14), 3753-8 (English) 1986. CODEN: TETRAB. 109-97-7 is also in the experiment. ISSN: 0040-4020. DOCUMENT TYPE: Journal CA Section: 27 (Heterocyclic Compounds (One Hetero Atom)) Nucleophilic addn. to but-1-en-3-one by the acyl anion equiv. of 2-formylpyrroles, generated by reaction with thiazolium salts, yields 1-(2-pyrrolyl)pentan-1,4-diones, which undergo the Paal-Knorr reaction with ammonia and primary amines to give the 2,2'-bipyrroles. Alternatively, the 2,2'-bipyrrole system can be obtained by pyrolysis of 2-azido-5-(2-pyrrolyl)penta-2,4-dienoic esters. .