Convenient direct syntheses of novel fused-ring CB4N5 systems by nitrile hydroboration †

syn-2,4-Bis(4-methoxybenzylidene)-trans-1,3-dithexyl-2,4-diaza-1,3-diboracyclobutane

“…The formation of the cyclodiborazane (-B-N-B-N-) ring can be accomplished via the hydroboration of nitrile groups and the subsequent association of two aldiminoborane molecules to form air-stable cyclic dimers (Hawthorne, 1962;Lloyd & Wade, 1964;Dorokhov & Lappert, 1969). The presence of the aldiminoborane structure as an intermediate in the borane (BH 3 )-promoted reduction of nitriles has also been reported (Coult et al, 1997;Jaganyi & Mzinyati, 2006). Prior structural reports have verified the presence of a squareplanar B 2 N 2 ring (Halfpenny, 1989;Britton & Emerson, 1999;Jennings et al, 1983).…”

Hydroboration and Diboration of Imines

“…Indeed, early work in this area has shown that addition of diborane to acetonitrile gave ethylborazine, (EtNBH) 3 , in 35 -40% yield (Scheme 12.15 ) [72,73] along with a number of carboraza bicyclic systems [74] . More recently, computational [75] and 11 B NMR spectroscopy [76] studies have investigated the mechanism of the reduction of nitriles using boranes, indicating an overall associative pathway for the case of acrylonitrile.…”

Synthesis of a new boron carbonitride with a B4C-like structure from the thermolysis of N-alkylated borazines

“…1), are easily prepared by the reaction of diborane with CH 3 CN and CH 3 CH 2 CN respectively. 9 Gas-phase thermolysis of these compounds at 500 °C under high-vacuum conditions (ca. 10 26 torr) results in the deposition, on quartz discs, of adhesive brown films with negligible oxygen contents.…”