Boron-Nitrogen Analogues of Cyclobutadiene, Benzene and Cyclooctatetraene

摘要: Abstract Iminoboranes RB [tbnd] NR′, isoelectronic with alkynes, cyclooligomerize to give B-N rings (RBNR′)n that are either analogues of cyclobutadienes (n = 2) or benzenes Dewar 3) cyclooctatetraenes 4), depending on the ligand set R/R′ and conducting oligomerization thermally catalytically. Cyclodimers cyclotetramers may undergo reversible interconversions formed irreversibly from cyclodimers. The (4+2) cycloaddition cyclodimers iminoboranes yields cyclotrimers. Cyclotrimers be converted into cyclodimers, poly(iminoboranes), polyalkynes, can depolymerized nido-Cluster derivatives N2B4H6, arachno-cluster N2B3H7, four-membered N2B2R3R′, five-membered N2B3R4R′ isolated, when three-membered NB2R3, cyclopropenyl cations, dimerize add aminoboranes H2B=NR′2 insert nitrenes R′N (from R′N3...