136237-57-5Relevant articles and documents
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.