- DIRECT SYNTHESIS OF BORON TRIIODIDE AND THE CHEMICAL TRANSPORT OF BORON WITH IODINE.
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The direct synthesis of BI//3 has been studied in the temperature range 600-1000 degree C by using a Pyrex closed-tube reactor with boron selectively heated by an image furnace. On the basis of the results obtained, the chemical transport of boron with iodine has been investigated by means of a standard sealed tube method and a modified de Boer iodide process. On condition that corrosion by BI//3 is avoided, transport proceeds from a colder to a hotter zone according to the exothermic reversible reaction B plus 3/2 I//2 reversible reaction BI//3, synthesis of BI//3 appears to be the major controlling step in the transport yield and rate. Elsewhere, an important purification effect is pointed out.
- Cueilleron,Viala
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- Syntheses and structures of 1,3,5-trihalogeno-1,3,5-triboracyclohexane derivatives
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On heating bis(diiodoboryl)methane (1c) and 1,1-bis(diiodoboryl)alkanes 1i, l (alkane = propane, butane) under reduced pressure elimination of BI 3 takes place and the corresponding 1,3,5-triiodo-1,3,5- triboracyclohexane derivatives 2c; 2i, i′; 2l, l′ are formed. Starting with bis(dichloroboryl)- and bis(dibromoboryl)methane (1a, 1b) only small amounts of the trimerization products (H2C-BCl)3 (2a) and (H2C-BBr)3 (2b) are detectable which can not be separated from 1a,b and by-products. Reaction of 1,3,5-trichloro-2,4,6- trimethyl-1,3,5-triboracyclohexane (2d) with BBr3 provides the corresponding bromo derivative 2e in high yield. An attempt to react 2,4-bis(dichloroboryl)-3-chloro-3-borapentane (4d) with 1,1- bis(trimethylstannyl)-2,2-diphenylethene does not lead to the expected trichloro-triboracyclohexane, but the divinylchloroborane ClB(CH=CPh 2)2 6a, is formed. The compositions of the products follow from analytical data and X-ray structure analyses of 2i, 2c, 2e, and 6a.
- Bayer, Michael J.,Müller, Thomas,L??lein, Wolfgang,Pritzkow, Hans,Siebert, Walter
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- Reference values for the B-X bond lengths of BI3 and BBr 3
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High-resolution X-ray analysis of BI3 and BBr3 single crystals as well as high-level theoretical calculations agree on accurate but long B-X bond distances that should be used as future reference to account for their structure, bondi
- Santiso-Quinones, Gustavo,Krossing, Ingo
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- Crystal structure of boron triiodide, BI3
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Boron triiodide as a micro-crystalline powder was obtained after sublimation of the reaction product of NaBH4 and iodine. An X-ray powder diagram of the temperature-, air-, and light-sensitive compound was collected at -73°C. According to the results of the Rietveld refinement, the crystal structure of BI3 is isotypic to that of BCl3 (space group P63/m, no. 176, a=699.09(2), c=736.42(3) pm). The B-I bond length was determined to be 211.2(8) pm. Wiley-VCH Verlag GmbH, 2001.
- Albert, Barbara,Schmitt, Konny
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- PURITY OF BORON PREPARED BY VACUUM DECOMPOSITION OF PURIFIED BORON TRIIODIDE.
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The synthesis, purification, and thermal decomposition of boron triiodide have been investigated as a method for preparing high purity boron. Using spark source mass spectrography for the analyses of bulk samples, the purity of boron is studied as a function of the purification treatments applied to BI//3 prior to its decomposition. Bisublimation, recrystallaization and, to a higher degree, zone refining of BI//3, result in a noticeble decrease in the levels of almot all impurities except carbon and oxygen. The lowest contamination levels attained are 200 and 470 wt. ppm for carbon and oxygen, respectively, and a total content of 150 wt. ppm for the other main impurities.
- Cueilleron,Viala
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- Access to adducts of parent iminoborane isomers, HBNH and NBH2, using frustrated Lewis pair chelation
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Adducts of the parent iminoborane isomers, HBNH and NBH2, have been prepared, each stabilized by the frustrated Lewis pair (FLP) chelateiPr2P(C6H4)BCy2(PB).PB{HBNH}was accessedviadehydrohal
- Ferguson, Michael J.,Frenette, Brandon L.,Oma?a, Alvaro A.,Rivard, Eric,Zhou, Yuqiao
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supporting information
p. 10895 - 10898
(2021/10/22)
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- Multiple Electrophilic C-H Borylation of Arenes Using Boron Triiodide
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Electrophilic C-H borylation of arenes using boron triiodide has been developed. This reaction proceeded smoothly in the absence of additives, and the diiodoboryl group was installed at the most sterically accessible carbon, where the HOMO is localized to a certain extent. Moreover, regioselective multiple borylation of polycyclic aromatic compounds was achieved by using excess boron triiodide. The borylated intermediates were transformed into a variety of arylboron compounds such as arylboronates, boronic acids, and trifluoroborates.
- Oda, Susumu,Ueura, Kenta,Kawakami, Bungo,Hatakeyama, Takuji
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supporting information
p. 700 - 704
(2020/02/04)
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