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 similar to 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. (c) 2007 Elsevier Ltd. All rights reserved.
作者:Satoshi Ito、Naoyuki Ochi、Takashi Murashima、Noboru Ono、Hidemitsu Uno
DOI:10.1039/b002213f
日期:——
A new synthesis of [2,3]naphthoporphyrins using 4,9-ethano-2H-benz[f]isoindole as a synthon of 2H-benz[f]- isoindole is described; soluble precursors of [2,3]naphthoporphyrins are converted into insoluble [2,3]naphthoporphyrins by simply heating at 290 °C.
practically, it is not an antiaromatic macrocycle, which we revealed by 1H NMR spectroscopy. The redox potentials had good correlations with Hammett substituent constant (σp) of the substituents at the meso‐positions. The free‐base dibenzoporphyrin(2.1.2.1) was able to form the metal complexes with nickel(II), copper(II), palladium(II), platinum(II), and tin(IV) ions. These results suggested that dibenzoporphyrin(2
在路易斯酸存在下,邻二吡咯基苯与各种醛的简单缩合反应已成功地报道了二苯并卟啉(2.1.2.1)的简便合成。该反应允许在不同的dibenzoporphyrin(2.1.2.1)衍生物与制备p取代的苯基,五元杂环,并且在乙炔基内消旋位上。二苯并卟啉(2.1.2.1)由两个通过邻位连接的二吡啶单元组成-亚苯基桥,采用高度弯曲的鞍形结构;X射线衍射分析证实了这一点。我们发现二苯并卟啉(2.1.2.1)可以描述为20π抗芳族共轭体系,但实际上,它不是抗芳族大环,我们通过1 H NMR光谱揭示了这一点。氧化还原电势与内消旋基团的哈米特取代基常数(σp)具有良好的相关性职位。游离碱二苯并卟啉(2.1.2.1)能够与镍(II),铜(II),钯(II),铂(II)和锡(IV)离子形成金属络合物。这些结果表明二苯并卟啉(2.1.2.1)衍生物可以用作各种金属离子的新型大环双阴离子四齿配体,从而提供具有不同光学和电化学性质的配合物。
Syntheses and Reactivity of <i>meso</i>-Unsubstituted Azuliporphyrins Derived from 6-<i>tert</i>-Butyl- and 6-Phenylazulene
作者:Timothy D. Lash、Jessica A. El-Beck、Gregory M. Ferrence
DOI:10.1021/jo701523s
日期:2007.10.1
to NMR solutions of 23-substituted azuliporphyrins 19 demonstrated that nucleophilic addition products were present in equilibrium with the parent porphyrinoids, but these adducts are less favored than for azuliporphyrins lacking the 23-substituents. Although nucleophilic attack of a peroxide anion is believed to be the first step in the conversion of azuliporphyrins to benzocarbaporphyrins with t-BuOOH
Synthesis and Characterization of <i>N</i>-Methylporphyrins, Heteroporphyrins, Carbaporphyrins, and Related Systems
作者:Alissa N. Latham、Timothy D. Lash
DOI:10.1021/acs.joc.0c01737
日期:2020.10.16
shifted UV–Vis absorptions compared to their core unsubstituted congeners. However, protonNMR spectroscopy demonstrated that these derivatives retained strong diamagnetic ring currents and the presence of the internal alkyl substituents had little effect on the global aromatic characteristics. Nevertheless, the UV–Vis spectra of N-methyl-oxybenzi- and N-methyl-oxypyriporphyrins were dramatically altered
Synthesis of Benziporphyrins and Heterobenziporphyrins and an Assessment of the Diatropic Characteristics of the Protonated Species
作者:Timothy D. Lash、Ashley M. Toney、Kylie M. Castans、Gregory M. Ferrence
DOI:10.1021/jo401365p
日期:2013.9.20
, and further reaction with palladium(II) acetate gave stable organometallic derivatives. The X-ray crystal structure of a palladium(II) benziporphyrin showed that the system deviates significantly from planarity. Although the benzitripyrranes failed to give stable macrocyclic products with furan or thiophene dialdehydes, they afforded tetraphenyl heterobenziporphyrins upon reaction with diphenyl-substituted