# Diazulenopentalene: Facile Synthesis of Linear Non-Alternant Molecular Carbons through Pt-Mediated Rearrangement

## TL;DR

Scientists synthesized a new carbon compound called diazulenopentalene using platinum, revealing its unique structure and properties.

## Contribution

A novel linear non-alternant hydrocarbon, diazulenopentalene, was synthesized via Pt-mediated rearrangement.

## Key findings

- Diazulenopentalene contains distinct pentalene and azulene units confirmed by single-crystal analysis.
- Computational studies elucidated the Pt-mediated rearrangement mechanism.
- The compound represents a promising platform for studying non-alternant molecular carbons.

## Abstract

Pentalene is a classic
8π antiaromatic non-alternant compound
that displays high reactivity. To stabilize pentalene and investigate
its properties, benzene rings are typically fused to its core. Advances
in metal-catalyzed chemistry have rapidly accelerated the development
of pentalene-incorporated molecular carbons. However, fully non-alternant
structures based on the pentalene skeleton remain underexplored due
to synthetic challenges. Here, we report the synthesis of a novel
linear non-alternant hydrocarbon, diazulenopentalene, achieved via
a Pt-mediated rearrangement arylation, with the mechanism elucidated
by computational studies. Single-crystal analysis, complemented by
aromaticity calculations, revealed that diazulenopentalene comprises
distinct pentalene and azulene units. The synthetic strategy presented
here provides a promising platform for a deeper investigation into
this unique linear molecular carbon.