What question did this study set out to answer?

This work aims to establish the historical significance of benzindenoquinolines and propose further studies.

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April 7, 2026Open Access

Benzhindeno1,2-bquinolines: Priority and Potential

Key Points

This work aims to establish the historical significance of benzindenoquinolines and propose further studies.
Reviewed historical synthesis of 7-phenyl-8-oxobenz[h]indeno[1,2-b]quinoline and 7-phenyl-8H-benz[h]indeno[1,2-b]quinoline.
Examined modern rediscovery of both compounds.
Proposed a program for photophysical and biological evaluation.
Both compounds previously synthesized in 1967 are not attributed in PubChem.
The reduced 8H form exhibits intense blue fluorescence and remains unexplored since its discovery.

Abstract

This report establishes the historical priority for two pentacyclic compounds — 7-phenyl-8-oxobenzhindeno1,2-bquinoline (C₂₆H₁₅NO, PubChem CID 122214121) and 7-phenyl-8H-benzhindeno1,2-bquinoline (C₂₆H₁₇N, PubChem CID 139041383) — first synthesised and characterised by H.B.F. Antaki in J. Chem. Soc. (C), 1967, 1581. Both compounds appear in PubChem without attribution to the 1967 original. The reduced 8H form, which exhibits intense blue fluorescence, has not been revisited since 1967. This Perspective documents the original synthesis, examines modern rediscovery of the scaffold, and proposes a programme for photophysical and biological evaluation of both forms.

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Charles H Antaki (Sun,) studied this question.

synapsesocial.com/papers/69d49f1cb33cc4c35a2279bf https://doi.org/https://doi.org/10.5281/zenodo.19428030

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