https://www.thieme.de/en/thieme-chemistry/synform-ring-contraction-of-metallacyclobutadiene-171975.htm
Ring Contraction of Metallacyclobutadiene - Thieme Chemistry - Georg Thieme Verlag
Haiping Xia and Yu-Mei Lin present a synthesis of metallacyclopropene from metallacyclobutadiene.
ring contractionthieme chemistrygeorgverlag