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Reaction of 3,3-dimethyl-1-butynyllithiumwith boron trichloride followed by hydroboration with HBCl 2  leads to 1,1-bis(dichloroboryl)-3,3-dimethylbutene (4a). Halogen exchange with boron triiodide yields the corresponding tetraiodide 4b, which undergoes a redox reaction with 3-hexyne to give the 1,3-dihydro-1,3-diborapentafulvene 3b. Its 1,3-dimethyl derivative 3c is less stable and rearranges to nido-C 4 B 2  carboranes as well as to polymeric products. Hydroboration of 3c with HBEt 2  results in the formation of the nido-C 3 B 3  carborane 6c. The reaction of 3c with Mo(CO) 6  yields the 1,3-diborapentafulvene complex 7c.

Eine einfache Synthese von 1,3-Dihydro-1,3-diborapentafulven-Derivaten / A Convenient Synthesis of 1,3-Dihydro-1,3-diborapentafulvene Derivatives