1-Substituted Perylene Derivatives by Anionic Cyclodehydrogenation: Analysis of the Reaction Mechanism

Area of Science:

• Organic Chemistry
• Materials Science
• Computational Chemistry

Background:

• Perylene derivatives are crucial for optoelectronic applications due to their unique properties.
• Anionic cyclodehydrogenation of binaphthyl derivatives is a proposed synthetic route, but its scope is limited.

Purpose of the Study:

• To theoretically and experimentally analyze the anionic cyclodehydrogenation mechanism for synthesizing 1-substituted perylenes.
• To investigate the influence of different substituents on the binaphthyl precursor during the reaction.

Main Methods:

• Density Functional Theory (DFT) calculations to model the reaction mechanism.
• Experimental synthesis using various substituted 1,1'-binaphthalene derivatives.
• Electron Paramagnetic Resonance (EPR) spectroscopy was considered for intermediate identification.

Main Results:

• DFT calculations suggest cyclization occurs from a binaphthyl dianion, characterized by an open-shell diradical nature.
• O-substituted binaphthyl derivatives failed to yield perylene derivatives due to radical anion fragmentation.
• A 49% yield of N,N-dimethylperylen-1-amine was achieved from the N-substituted precursor using a simplified method.

Conclusions:

• The cyclization mechanism for perylene synthesis from binaphthyl derivatives involves a dianion intermediate.
• The presence and type of substituent significantly impact the reaction's success.
• N-substituted binaphthyl derivatives offer a viable pathway for efficient N,N-dimethylperylen-1-amine synthesis.