Ring Contraction of Metallacyclobutadiene to Metallacyclopropene Driven by π- and σ-Aromaticity Relay
Haiping Xia and Yu-Mei Lin present a synthesis of metallacyclopropene from metallacyclobutadiene.
Aromaticity has been one of the most fundamental and fascinating concepts ever since it was first proposed by Hückel in 1831. Aromaticity-driven reactions are crucial in synthetic chemistry, owing to the relatively low energies of aromatic products. π-Aromaticity is an important driving force in directing the synthesis of aromatic compounds; in contrast, reactions induced by σ-aromaticity are uncommon. In this recently published study, a team led by Professors Haiping Xia and Yu-Mei Lin from Xiamen University (P. R. of China) & Southern University of Science and Technology at Shenzen (P. R. of China) developed a π- and σ-aromaticity relay strategy to realize an unprecedented ring contraction of metallacyclobutadiene to metallacyclopropene.