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Metal Complexes with Tetrapyrrole Ligands, XLIV. Configuration and Conformation of theanti-5,15-Dialkyl-2,3,7,8,12,13,17,18-octaethyl-5H,15H-porphyrins (Decaalkylporphodimethenes)

✍ Scribed by Botulinski, Andreas ;Buchler, Johann W. ;Abbes, Nour Eddine ;Scheidt, W. Robert

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 530 KB
Volume: 1987
Category: Article
ISSN: 0947-3440
DOI: 10.1002/jlac.198719870326

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✦ Synopsis

The configurations and conformations of 5.1 S-dialkyloctaethylporphodimethenes HdOEPRd are described for R = Me. Et, iPr, tBu. The "normal" compounds (1 a to ld) have the syn-axial ("au") configuration, the %nomalous" isomers (2b to 4b) the anti configuration at CS.15. This is proved by a crystal structure analysis of the anomalous quasiplanar diisopropyl derivative 3b (monoclinic, p?&). 'H-NMR analyses corroborate these assignments and give dctails of the conformations in solution. By heating in glacial acetic acid, 3b is quantitatively isomerized to give 3a.

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