Boron triiodide

Boron Triiodide. Boron ttiiodide is not manufactured on a large scale. Small-scale production of BI from boron and iodine is possible in the temperature range 700—900°C (70—72). Excess I2 can be removed as Snl by reaction with Sn, followed by distillation (71). The reaction of metal tetrahydroborates and I2 is convenient for laboratory preparation of BI (73,74). BI can also by synthesized from B2H and HI in a furnace at 250°C (75), or by the reaction of B with excess Agl or Cul between 450—700°C, under vacuum (76). High purity BI has been prepared by the reaction of I2 with mixtures of boron carbide and calcium carbide at elevated temperatures. 

Boron Triiodide. There are no large-scale commercial uses of boron ttiiodide. It can cleave ethers without affecting aldehyde groups and thus finds use in the synthesis of the antibiotic fmstulosin (115,116). BI is used to prepare Snl, Sbl, and Til (117) in 99—100% yield. It is used to clean equipment for handling UE (118) and in the manufacture of lithium batteries (119). 

Boron triiodide rapidly cleaves methyl ethers of ortho-, meta-, or para-suhsti-tuted aromatic aldehydes (0°, 25° 0.5-5 min 40-86% yield). 

C21-0086. Boron trichloride is a gas, boron tribromide is a liquid, and boron triiodide is a solid. Explain this trend... 

Either the white or red form incandesces with boron triiodide [1]. Red phosphorus incandesces in seleninyl choride while white explodes. Red phosphorus reacts vigorously on warming with sulfuryl chloride or disulfuryl chloride, and violently with disulfur dibromide [2],... 

Dinitrobenzenes Dinitrotoluenes 1,4-Dioxane Esters Ethylamine Ethers Ethylene Nitric acid Nitric acid Silver perchlorate Nitrates Cellulose, oxidizers Oxidizing materials, boron triiodide Aluminum trichloride, carbon tetrachloride, chlorine, nitrogen oxides, tetrafluo-roethylene... 

Treating the oxide, trichloride, or metal with boron tribromide or boron triiodide has produced tribromides and triiodides for lanthanum (119). Presumably, treating the metal or the oxide with boron trichloride will produce the trichloride. 

Ammonium periodate, 4514 Azidoiodoiodonium hexalluoroantimonate, 4361 [I, /-Bis(trilluoroacetoxy)iodo]benzene, 3239 Boron triiodide, 0150... 

Boron trifluoride diethyl etherate, 1674 Boron triiodide, 0150... 

Ammonium periodate, 4509 Azidoiodoiodonium hexafluoroantimonate, 4355 [7,/-Bis(trifluoroacetoxy)iodo]benzene, 3233 Boron triiodide, 0150... 

Boron triiodide cleaves lactone to yield iodomethyl benzoic acids (equation 138)933. 

Boron trichloride, boron tribromide, and boron triiodide, in contrast to the trifluoride, are all rapidly hydrolyzed in water (explosively so in the case of BI3) to generate B(OH)3 and HX as indicated above, all are stronger Lewis acids than BF3. While BC13 and BBr3 are volatile liquids, BI3 is an unstable white solid that polymerizes on standing. The BX anions are all known, but the larger ones —especially BI4—require stabilization by a large cation. 

Boron Tribromide and Boron Triiodide. Boron tribromide is prepared commercially in relatively small quantities by the bromination of boron carbide, and its commercial use is limited. No commercial use for boron triiodide has been reported. Laboratory quantities of boron tribromide can be prepared by the reaction of aluminum bromide with boron trifluoride or a metal fluoroborate. Boron triiodide can be prepared in small quantities by the reaction of boron or a metal tetrahydroborate with iodine. 

ETHERS Boron trifluoride-Ethanethiol. Boron trifluoride etherate. Boron triiodide. Lithium triethylborohydride-Aluminum r-butoxlde complex. Phase-transfer catalysts. 

Secondary aliphatic phosphines are prepared by other methods, which have been described. Secondary phosphines form molecular addition compounds with boron halides. Dehydrohalogenation of diphenylphosphine-boron triiodide (or diphenylphosphine-boron tribromide) gives the dimeric phosphinoborane. The following method of preparation makes isolation of the intermediate addition compound unnecessary. Reaction of dibutyl(trimethy 1-silyl)phosphine with boron tribromide and ehmination of bromotrimethylsilane gives a dimeric phosphinoborane also. ... 

Related Reagents. Boron Triiodide R)-2-r-Butyl-6-methyl-4ff-1,3-dioxin-4-one (5)-4-Benzyl-2-oxazolidinone (/ ,/ )-1,2-Diphenyl-1,2-diaminoethane A dV -Bis[3,5-bis-... 

Bayer and Siebert reported the reaction of 3,3-dimethyl-l-butyne with -BuLi in pentane, followed by the addition of boron trichloride to afford the intermediate dichloro(3,3-dimethylbut-l-ynyl)borane that was hydroborated with dichloroborane formed in situ to give l,l-bis(dichloroboryl)-3,3-dimethylbutene 51 (Scheme 6) <2002ZN1125>. When the latter was subjected to halogen exchange with boron triiodide, it was converted into the corresponding tetraiodide 52, which underwent a redox reaction with hex-3-yne to give the 2-(2,2-dimethylpropylidene)-l,3-diborole 22 in 73% yield. 

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