SEARCH Articles Figures Tables Cyclobutadien Cyclobutadiene Cyclobutadiene dimerization Cyclobutadiene dimerization Cyclobutadienes Cyclobutadienes from alkyne dimerization Cyclobutadienes, dimerization Cyclobutadienes, dimerization Cyclobutadienes, dimerization Cyclobutanation Cyclobutadienes, dimerization intramolecular Dimerization of Cyclobutadiene