Borylene Transfer from an Iron Bis(borylene) Complex: Synthesis of 1,4-Diboracyclohexadiene and 1,4-Dibora-1,3-Butadiene Complexes

摘要

Heteroboracycles that contain one boron atom, such as borirenes (I), boroles (II), and borepines (III) (Figure 1) have attracted interest with regard to Huckel aromaticity/anti-aromaticity and their potential application as building blocks for π-conjugated oligomeric or polymeric systems with potentially remarkable linear, nonlinear, and electro-optical properties.' Recently, we turned our attention to diboraheterocycles that contain more than one electron-deficient center, that is, 1,4-diboracyclohexadienes (IV), the heretofore unknown 1,2-diborabutenes (V) and their constitutional isomers 1,4-dibora-1,3-butadienes (VI; Figure 1).