473475-21-7Relevant articles and documents
Reactions of tri-tert-butylazadiboriridine NB2R3 with carbonyl and similar species
Paetzold, Peter,Kiesgen, Jutta,Luckert, Stefan,Spaniol, Thomas,Englert, Ulli
, p. 1631 - 1635 (2008/10/08)
The carbonyl group of X(R')CO is added to the B-B bond of the three-membered ring compound NB2R3 (1; R = tBu) to give the five-membered rings [-BR-NR-BR-X(R')C-O-] (2a-d; R'/X = tBu/H, Ph/Ph, H/OMe, H/NMe2). The tetraazoniatetraboratatricyclo[6.2.0.03,6]deca-2,4,7,9-tetraenes N4B4C2R6R'2 (4a, b; R' = Me, Et), known products from the reaction of 1 with isonitriles CNR', undergo a rearrangement to give the corresponding deca-1,4,6,9-tetraenes 6a, b by the migration of two tBu groups from boron to carbon on photolysis; the structure of 6a is confirmed by X-ray analysis. The reaction of CO, generated from carbonylmetal complexes (photolytically from [Cr(CO)6] or [Cp2Fe2(CO)4]; thermally from [Fe2(CO)9] or [Co2(CO)8]), with 1 gives the 3,7-dioxonia-1,5-diazonia-2,4,6,8-tetraboratanaphtalene O2N2C2B4R6 (7), as has been known from the reaction of [Fe(CO)5] and 1. The product 7 is also obtained from the isomeric dispiro compound 5, the known product from the reaction of 1 with gaseous CO at -78°C, by standing in solution at room temperature. Surprisingly, the reaction of 1 with CO from the photolysis of [CpMn(CO)3] gives a naphthalene-type isomer of 7, the 1,5-dioxonia-3,7-diazonia species 8, the crystal structure of which is reported.
