By Pd-catalyzed alkynylation (Stille coupling) the compounds 1, the first perethynylated cyclobutadiene complexes, can be obtained in one step from [(C4l4)Fe(CO)3]. R = H, tBu, SiMe3, C8H17.
No takes yet. Share an insight, caveat, or question.
Bunz et al. (1993) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: