Boradigermaallyl: (4+3) Cycloaddition‐Initiated Boron Insertion into Benzene
Ralf H. Kern, Meike Schneider, Klaus Eichele, Hartmut Schubert, Holger F. Bettinger, Lars Wesemann
Abstract
The 2π electron 1,3-dipole boradigermaallyl, valence-isoelectronic to an allyl cation, is synthesized from a bis(germylene). It reacts with benzene at room temperature by insertion of a boron atom into the benzene ring. Computational investigation of the mechanism shows the boradigermaallyl reacting with a benzene molecule in a concerted (4+3) or [π4s+π2s] cycloaddition reaction. Thus, the boradigermaallyl acts as a highly reactive dienophile in this cycloaddition reaction with nonactivated benzene as diene unit. This type of reactivity provides a novel platform for ligand assisted borylene insertion chemistry.
Topics & Concepts
CycloadditionBenzeneChemistryBoronPhotochemistryReactivity (psychology)Valence (chemistry)MoleculeMedicinal chemistryRing (chemistry)Organic chemistryCatalysisAlternative medicineMedicinePathologyOrganoboron and organosilicon chemistrySynthesis and characterization of novel inorganic/organometallic compoundsOrganometallic Complex Synthesis and Catalysis