12008-47-8Relevant articles and documents
Studies on BCl and on the exchange reaction of BCl3 with polyboron flourides
Pardoe, Jennifer A.J.,Norman, Nicholas C.,Timms, Peter L.
, p. 543 - 548 (2008/10/08)
Gaseous BCl has been prepared at low pressure by reaction of BCl3 with boron at 2000 °C or by decomposition of B2Cl4 using either an electric discharge or using flash thermolysis at 1150 °C, and then condensed at - 196 °C. Reasons are discussed why each method gives BCl capable of generating (Cl2B)3BCO when the condensate at - 196 °C is treated with CO, but B4Cl4 is only formed from BCl prepared from B2Cl4. The stepwise conversion of (F2B)3BCO to (Cl2B)3BCO by treatment with BCl3 has been followed by 11B NMR spectroscopy. Evidence from mass spectrometry and 11B NMR spectroscopy suggests that reaction of polyboron fluorides, particularly B8F12 and B10F12, with BCl3 yields a new form of B9Cl9 of, as yet, unknown structure which converts slowly to closo-B9Cl9 or closo-B8Cl8 depending on the solvent.
Fluorination of boron chlorides and boron bromides by reaction with bis(trifluoromethyl)mercury, trichlorofluoromethane, or tribromofluoromethane: Synthesis of BF2B5H8
Saulys,Castillo,Morrison
, p. 1619 - 1624 (2008/10/08)
The interaction of BCl3 with excess CFCl3 has been examined by 11B and 19F NMR. Although small amounts of BFCl2 and BF2Cl, 9% each, are observed after 283 h at 65°C, BF3 is not a major product. At 130°C, however, BF3 is formed in 89% yield after 33 h. Boron trifluoride is isolated in 98 and 97% yields from the reactions of BCl3 and BBr3, respectively, with CFBr3 at 130 °C. At ambient temperature, Hg(CF3)2 reacts with BCl3 and BBr3, generating BF3 in 99 and 98% yields, respectively. The reaction of B2Cl4 with excess CFCl3 was followed spectroscopically at 65, 90, and 130°C, and the 19F chemical shifts of the partially fluorinated diboron tetrahalides have been assigned. Diboron tetrafluoride was isolated from the reaction between B2Cl4 and CFBr3 in 89% yield, from B2Br4 and CFBr3 in 78% yield, and from B2Cl4 and Hg(CF3)2 in 89% yield. Within 45 min the reaction between 1-BCl2B5H8 and Hg(CF3)2 produces the new compound 1-BF2B5H8 in 96% yield. Tetraboron tetrachloride is by far the least reactive of the boron chlorides examined.
