A (preferably nonaqueous) method of making a dipyrromethane is described. The comprises the steps of: (a) providing a reaction system consisting essentially of an aldehyde or acetal, excess pyrrole and a catalyst; (b) reacting the aldehyde or acetal with the pyrrole in the reaction system to form the dipyrromethane therein; (c) quenching the reaction system by adding a base thereto (preferably without simultaneously or concurrently adding water and/or an organic solvent thereto); (d) separating the catalyst from the reaction system; and then (e) separating the pyrrole from the reaction system to produce the dipyrromethane as a residual
π-Extended “Earring” Porphyrins with Multiple Cavities and Near-Infrared Absorption
作者:Yutao Rao、Taeyeon Kim、Kyu Hyung Park、Fulei Peng、Lei Liu、Yunmei Liu、Bin Wen、Shubin Liu、Steven Robert Kirk、Licheng Wu、Bo Chen、Ming Ma、Mingbo Zhou、Bangshao Yin、Yuexing Zhang、Dongho Kim、Jianxin Song
DOI:10.1002/anie.201600955
日期:2016.5.23
elucidated by x‐ray diffraction analysis, and feature curved π planes. The electronic spectra of the porphyrins exhibit near‐infrared (NIR) absorptions and metal insertion leads to red‐shifted and intensified absorption features. Electrochemical analysis and transient absorption measurements indicated that the porphyrins exhibit effective electronic communication between their central and peripheral
Fused Hybrids of a [22]Smaragdyrin BF
<sub>2</sub>
Complex with a Ni
<sup>II</sup>
Porphyrin
作者:Yang Liu、Daguan Xie、Yutao Rao、Ling Xu、Mingbo Zhou、Atsuhiro Osuka、Jianxin Song
DOI:10.1002/anie.202206601
日期:2022.9.12
Directly fused porphyrinoids with wavy structures have been synthesized by the Suzuki–Miyaura coupling of [22]Smaragdyrin BF2 complexes with NiII porphyrins and a subsequent oxidative fusion reaction with FeCl3. The fusedhybrids with cycloheptatriene linkages exhibit red-shifted and enhanced absorption bands in the near-infrared region.
A Scalable Synthesis of Meso-Substituted Dipyrromethanes
作者:Joydev K. Laha、Savithri Dhanalekshmi、Masahiko Taniguchi、Arounaguiry Ambroise、Jonathan S. Lindsey
DOI:10.1021/op034083q
日期:2003.11.1
A one-flask synthesis of meso-substituted dipyrromethanes has been refined. The procedure entails reaction of an aldehyde in 100 equiv of pyrrole as the solvent containing a mild Lewis acid (e.g., InCl3) at room temperature. Following removal and recovery of excess pyrrole, the dipyrromethane is obtained by crystallization. The procedure generates minimal waste and does not require aqueous/organic extraction, chromatography, or distillation. The procedure has been scaled linearly to obtain >100 g of 5-phenyldipyrromethane. The utility of various analytical methods for characterizing dipyrromethanes has been investigated.
Syntheses of Core-Modified Corroles by Three Different [3 + 1] Methodologies
作者:Jeyaraman Sankar、Harapriya Rath、Viswanathan PrabhuRaja、Tavarekere K. Chandrashekar、Jagadese J. Vittal
DOI:10.1021/jo0497398
日期:2004.7.1
Three new methods for syntheses of modified oxa corroles bearing one meso free carbon in reasonably good yields are reported. The formation of the meso carbon bridge and the direct pyrrole-pyrrole linkage occur in a single step by a simple condensation and coupling with TFA as a catalyst with appropriate precursors. The reactions are optimized with different conditions by varying the meso substituents, acid catalyst concentration, and the nature of the solvent to afford corroles in good yields.