13703-88-3Relevant articles and documents
Vaporization and thermal decomposition of B,B',B''-tribromoborazine
Kazakov,Timoshkin
, p. 557 - 563 (2012/07/14)
Vapor pressure as a function of temperature above solid and liquid (BrBNH)3 and the thermody-namic parameters of (BrBNH)3 sublimation and vaporization have been determined using static tensimetry with membrane null-manometer. The thermal decomposition of tribromoborazine has been studied in the saturated and unsaturated vapor regions. Irreversible decomposition occurred at noticeable rates at temperatures higher than 343 K and was accompanied by HBr evolution. In the unsaturated vapor region, thermal decomposition has far lower rates than in the saturated vapor region because of diffusion limitations. The activation energy of condensed-phase thermal decomposition of B,B',B''-tribromoborazine is 65 ± 3 kJ/mol, and this value proves that tribromoborazine decomposition at low temperatures is not accompanied by opening of the boron-nitrogen cycle.
Preparation of unsymmetrically B-substituted borazines and characterization of tris(4,6-diethylborazin-2-yl)amine
Bai,Niedenzu,Serwatowska,Serwatowski
, p. 4631 - 4635 (2008/10/08)
Symmetrically substituted B,B′,B″-triorganylborazines, (RBNR′)3, react with an equimolar quantity of boron trihalide, BX3 (X = Cl, Br), to form B-monohaloborazines, XR2B2N3R3, as well as RBX2, and with 2 molar equiv of BX3 to form the B,B′-dihaloborazines, X2RB3N3R′3. The compounds are obtained in good yield and purity, and are easily converted to other unsymmetrically B-substituted borazines. The borazines X(CH3)2B3N3(CH3) 3 (X = SCH3, NH2, C4H9, N[Si(CH3)2]), X(C2H5)2B3N3H3 (X = Br, SCH3), Cl(C2H5)2B3N3(CH 3)3, X2(C2H5)2B3N 3H3 (X = Br, SCH3), Cl(C6H5)2B3N3H 3, and Cl2(C2H5)B3N3(CH 3)3 have been prepared and characterized. The compound (H2N)(C2H5)2B3N 3H3 could not be obtained in the pure state; instead, it slowly condenses (even at room temperature) with the formation of the bis(borazin-2-yl)amine HN[(C2H5)2B3N3H 3]2 and the tris(borazin-2-yl)amine N[(C2H5)2B3N3H 3]3. The borazine (H2N)(CH3)2B3N3(CH 3)3 condenses at temperatures from 250 to 270°C to give HN [(CH3)2B3N3(CH3) 3]2. Reaction of this bis(borazin-2-yl)amine with LiC4H9 yields (C4H9)(CH3)2B3N 3(CH3)3 and (NHLi)(CH3)2B3N3(CH 3)3; the latter then reacts with Cl(CH3)2B3N3(CH3) 3 to regenerate HN[(CH3)2B3N3(CH3) 3]2. The unsymmetricaliy N-substituted borazine (C2H5)3B3N3H 2[Si(CH3)3] has been isolated and characterized.
