Monomeric Chiral and Achiral Basket-Handle Porphyrins: Synthesis, Structural Features, and Arrested Tautomerism

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• 作者：Andreas C. Gehrold ; Torsten Bruhn ; Heidi Schneider ; Udo Radius ; Gerhard Bringmann
• 刊名：Journal of Organic Chemistry
• 出版年：2015
• 出版时间：December 18, 2015
• 年：2015
• 卷：80
• 期：24
• 页码：12359-12378
• 全文大小：940K
• ISSN：1520-6904

文摘

Chiral and achiral basket-handle porphyrins (BHPs) with different p-xylene straps and peripheral solubilizing groups were synthesized using a previously established synthetic approach. Subsequent modification, functionalization, and metalation of the tetrapyrrolic macrocycle yielded more than 80 BHPs. The chiral representatives were resolved into their enantiomers, whose absolute configurations were determined by comparison of their ECD spectra with other experimental or quantum chemically calculated spectra. NMR studies and coupled-cluster calculations proved that the free base BHPs, although highly symmetric, exhibited the phenomenon of 鈥渁rrested tautomerism鈥? Comparison of the solid-state structures of three metalated BHPs offered detailed insight into their three-dimensional shape. Finally, directly linked dimeric porphyrins with a BHP subunit were synthesized from functionalized BHPs to prove their value as synthetic building blocks.