13517-10-7

Basic information

• Product Name: BORON TRIIODIDE
• Synonyms: BORON IODIDE;BORON TRIIODIDE;BI;BI3;Borane, triiodo-;Borane,triiodo-;triiodo-boran;Triiodoborane
• CAS NO: 13517-10-7
• Molecular Formula: BI₃
• Molecular Weight: 391.52
• EINECS: 236-857-4
• Product Categories: C-X Bond Formation (Halogen);Iodination;Synthetic Reagents
• Mol File: 13517-10-7.mol
• Article Data: 7

Chemical Properties

• Melting Point: 43-44°C
• Boiling Point: 210°C
• Flash Point: 210°C
• Appearance: White/Crystals
• Density: 3.35 g/mL at 25 °C(lit.)
• Storage Temp.: 2-8°C
• Water Solubility: Reacts with water.
• Sensitive: Moisture Sensitive
• CAS DataBase Reference: BORON TRIIODIDE(CAS DataBase Reference)
• NIST Chemistry Reference: BORON TRIIODIDE(13517-10-7)
• EPA Substance Registry System: BORON TRIIODIDE(13517-10-7)

Safety Data

• Hazard Codes: C
• Statements: 34
• Safety Statements: 26-36/37/39-43-45
• RIDADR: UN 3260 8/PG 2
• WGK Germany: 3
• F: 10
• TSCA: Yes
• HazardClass: 8
• PackingGroup: II
• Hazardous Substances Data: 13517-10-7(Hazardous Substances Data)

Usage

Chemical Properties

needles or crystal(s) with 99.9% purity; unstable; enthalpy of vaporization 40.5 kJ/mol. It is a crystalline solid, which reacts vigorously with water to form hydroiodic acid and boric acid. Boron triiodide is easily decomposed when heated, and reacts with red phosphorus or white phosphorus to incandescent.Boron triiodide is an electron-deficient compound with unsaturated boron atoms, so its chemical properties are mainly Lewis acid properties, and it can react with various Lewis bases to form complexes.

Uses

Different sources of media describe the Uses of 13517-10-7 differently. You can refer to the following data:
1. Boron triiodide is used as pharmaceutical, chemical and organic intermediate. It is also used as a catalyst and for preparation of boron compounds.
2. Boron triiodide can be used as a reagent to cleave C-O bonds in ethers, esters, and alcohols. It can also be used to cleave silanes and halides. Boron triiodide converts alcohols to alkyl iodides; sulfonyl and sulfinyl to disulfides. Borylation of triarylamines can be achievd using this reagent.It can also be used to prepare imidazole based imino aluminum dihalide metal complexes and boron carbonitride (BCN) nanowires.

Preparation

Boron triiodide can be synthesized by refluxing lithium borohydride and iodine in hexane, or by reacting alkali metal borohydride with iodine at a suitable temperature.

General Description

Boron triiodide is a strong Lewis acid. It can be prepared by treating iodine (I2) with potassium borohydride (KBH4) in heptane.

InChI:InChI=1/B.3HI/h;3*1H/q+3;;;/p-3

Synthetic route

1,1-bis(diiodoboryl)methane (98370-06-0) → 1,3,5-triiodo-1,3,5-triboracyclohexane + (I2BCH2)2BI + boron triiodide (13517-10-7)

Conditions	Yield
In neat (no solvent) B compd. degassed and heated under stirring at 160°C in vac. for 13 d; distd. in vac.;	A 7% B n/a C n/a

boron trioxide + sodium iodide (7681-82-5) → boron triiodide (13517-10-7)

Conditions	Yield
800-1000°C;

iodine (7553-56-2) + diborane (19287-45-7) → boron triiodide (13517-10-7)

bismuth (7440-69-9) + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
In neat (no solvent) melting I2 with Bi;;

silver(I) iodide → boron triiodide (13517-10-7)

Conditions	Yield
With B In neat (no solvent) in high vac. and at 1000°C; (thermal decompn. of AgI);
With B In neat (no solvent) in high vac. and at 1000°C; (thermal decompn. of AgI);

ferrobor + silver(I) iodide → boron triiodide (13517-10-7)

Conditions	Yield
at ca 850°C in vac.;

boron → boron triiodide (13517-10-7)

Conditions	Yield
With iodine reaction of B prepared according to Woehler, Saint-Claire Deville, at 700-800°C;
With hydrogen iodide at >1300°C with HI gas;
With silver(I) iodide at higher temp.;	0%
With AgI at higher temp.;	0%
With hydrogen iodide at >1300°C with HI gas;

boron + hydrogen iodide (10034-85-2) → iodine (7553-56-2) + boron triiodide (13517-10-7)

Conditions	Yield
In neat (no solvent) well dried HI reacts at 700-800°C; Iron- and sodium borides present as impurities in amorphous boron have catalytic effect on formation of BI3;;

hydrogen iodide (10034-85-2) + boron trichloride (10294-34-5) → boron triiodide (13517-10-7)

Conditions	Yield
well dried HI passed over BCl3 in porcelaine tube heated to red heat;;
at red heat in a china tube;
at red heat in a china tube;
well dried HI passed over BCl3 in porcelaine tube heated to red heat;;

boron tribromide (10294-33-4) → boron triiodide (13517-10-7) + BBr2I + BBrI2

Conditions	Yield
With hydrogen iodide byproducts: I2; 300-400 °C, in a heated tube;
With HI byproducts: I2; 300-400 °C, in a heated tube;

hydrogen iodide (10034-85-2) + boron tribromide (10294-33-4) → boron triiodide (13517-10-7) + BBr2I + BBrI2

Conditions	Yield
In neat (no solvent) with dry HI; at higher temp.;;
In neat (no solvent) with dry HI at ambient temp.;;	A 0% B 0% C 0%
300-400 °C; treated with Hg to remove I2; distn.;

boron(III) sulfide + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
introduction of I2 vapour over B2S3 at red heat;
introduction of I2 vapour over B2S3 at red heat;

boron + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
at higher temp.;	0%
B is cleaned with acids ; at 1200 °C;	0%
B is prepared by the method of Moissan;	0%

decaborane + iodine (7553-56-2) → diiododecaborane + boron triiodide (13517-10-7)

Conditions	Yield
byproducts: HI;	A n/a B 0%

potassium borohydride + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
In n-heptane byproducts: KI, HI, H2; N2 atmosphere; stirring (25°C); filtration, solvent removal (distn., vac. evapn. at 0°C), bisublimation, recrystn. (heptane, cooling to -20°C), zone melting;
In n-heptane at 110℃; for 8h; Inert atmosphere;	15.5 g

lithium borohydride + iodine (7553-56-2) → boron triiodide (13517-10-7) + lithium iodide

Conditions	Yield
at 120°C, under N2; removing of I2: reaction mixt. dissolved in CS2, addn. of Zn or Hg, filtering, evapn. of solvent, sublimation in vac. twice;	A 64-66 B n/a

sodium tetrahydroborate (16940-66-2) + iodine (7553-56-2) → boron triiodide (13517-10-7) + sodium iodide (7681-82-5)

Conditions	Yield
byproducts: HI, I2; at 200°C, under N2; removing of I2: reaction mixt. dissolved in CS2, addn. of Zn or Hg, filtering, evapn. of solvent, sublimation in vac. twice;	A 45-50 B n/a

sodium tetrahydroborate (16940-66-2) + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
In hexane byproducts: NaI, H2, HI; mixt. refluxed in n-hexane under Ar (80°C, 84 h); NaI filtered under Ar, solvent evapd. at 25°C in vac., purifd. bysublimation;
In n-heptane (inert atm.); treatment of sodium hydridoborate with iodine in heptane; A.G. Briggs, Naturwissenschaften 1990, 77, 595-597;

nickel boride + iodine (7553-56-2) → boron triiodide (13517-10-7)

Conditions	Yield
In neat (no solvent) at dark red heat;;
In neat (no solvent) at dark red heat;;

boron monoiodide (13842-56-3) + phosphorus (12185-09-0) → boron phosphide + boron triiodide (13517-10-7)

Conditions	Yield
at 900°C;

hydrogen iodide (10034-85-2) + diborane (19287-45-7) → (monoiodo)diborane(6) (20436-27-5) + boron triiodide (13517-10-7)

Conditions	Yield
byproducts: H2; equimolar amts. of B2H6 and HI; B2H5I obtained from liq. phase at reduced pressure;	A >99 B n/a

boron trifluoride (7637-07-2) + aluminium(III) iodide (7784-23-8) → boron triiodide (13517-10-7)

boron + hydrogen iodide (10034-85-2) → boron triiodide (13517-10-7)

Conditions	Yield
B is cleaned with acids ; at 1200 °C;	0%
B (prepared by the method of Woehler) is treated previously in H2 flow and reacted at high temp. with HI; solved in CS2, the soln. is treated with Hg, evapn.;
B is prepared by the method of Woehler ; slight yield;

(monoiodo)diborane(6) (20436-27-5) → boron triiodide (13517-10-7) + diborane (19287-45-7)

Conditions	Yield
equil. state reached in 8 h at 24°C, with initial pressure 43.4 Torr, in absence of light; IR study of samples from gas phase;

(monoiodo)diborane(6) (20436-27-5) → boron triiodide (13517-10-7)

Conditions	Yield
disproportionation;

diboron tetraiodide (13703-80-5) → B(x)I(x) + iodine (7553-56-2) + boron triiodide (13517-10-7)

diboron tetraiodide (13703-80-5) → B8I8 + B9I9 + boron triiodide (13517-10-7)

Conditions	Yield
In solid after decomposing samples of B2I4 at 100-400°C and removing the BI3 it was found that the dark residue would sublime at temp. in excess of 250°C at E-4 mm Hg pressure; mass spectral analysis showed that the sublimate was mainly B9I9 with about 15% of B8I8;

beryllium borocarbide → beryllium iodide + boron triiodide (13517-10-7)

Conditions	Yield
With iodine at the fusing temp. of glass; only small amount of products;

(iodo)selenoborane (21931-14-6) → boron selenide + boron triiodide (13517-10-7)

Conditions	Yield
above 170°C; (quick decompn. above 350°C);

triiodo borthiine (13845-21-1) → diboron trisulfide + boron triiodide (13517-10-7)

zirconocene dichloride (1291-32-3) + boron triiodide (13517-10-7) → bis(cyclopentadienyl)zirconium diiodide

Conditions	Yield
In diethyl ether (π-C5H5)2ZrCl2/BI3 (molar ratio: 3:2);;	100%
In diethyl ether (π-C5H5)2ZrCl2/BI3 (molar ratio: 3:2);;	100%

bis(cyclopentadienyl)hafnium dichloride (12116-66-4) + boron triiodide (13517-10-7) → bis(cyclopentadienyl)hafnium diiodide

Conditions	Yield
In dichloromethane (π-C5H5)2HfCl2/BI3 (molar ratio 3:2); inert atm.; 5 min. in CH2Cl2;;	100%
In dichloromethane (π-C5H5)2HfCl2/BI3 (molar ratio 3:2); inert atm.; 5 min. in CH2Cl2;;	100%

boron triiodide (13517-10-7) + phenylacetylene (536-74-3) → (2-iodo-1-phenylvinyl)diiodoborane (51245-98-8, 51245-99-9) + (2-iodine-2-phenylvinyl)diiodoborane (51245-97-7, 51246-17-4)

Conditions	Yield
In Petroleum ether soln. of phenylacetylene added to stirred soln. of BI3 at -70°C,5 min; cis and trans isomers of each vinyl product obtained in 1:1 ratio; vac. distn.;	A 1% B 99%
In petroleum ether

(benzyl alcohol)tricarbonylchromium(0) (12116-45-9) + boron triiodide (13517-10-7) → (CO)3CrC6H5CH2I (83299-76-7)

Conditions	Yield
In dichloromethane stirring at -78°C for 1 h, quenching (satd. aq. NaHCO3), warming to room temp.; addn. of H2O, extn. (Et2O), drying (MgSO4), filtration, concn.;	99%

(η(6)-benzyl methyl ether)tricarbonyl chromium (89974-41-4) + boron triiodide (13517-10-7) → (CO)3CrC6H5CH2I (83299-76-7)

Conditions	Yield
In dichloromethane stirring at -78°C for 1 h, quenching (satd. aq. NaHCO3), warming to room temp.; addn. of H2O, extn. (Et2O), drying (MgSO4), filtration, concn.;	99%

hex-3-yne (928-49-4) + boron triiodide (13517-10-7) → cis-3-diiodoboryl-4-iodo-3-hexene (66436-44-0)

Conditions	Yield
In pentane N2 or Ar, equimol., to a soln. of BI3 added dropwise at -25°C 3-hexyne, warmed to room temp.; decanted, dried (vac.);	99%

(C6F5)2(CH3)2C3HN2Si(CH3)3 + boron triiodide (13517-10-7) → (C6F5)2N2(CH3)2C3HBI2

Conditions	Yield
In toluene (under Ar, Schlenk); soln. of BI3 in toluene added to soln. of ligand intoluene at ambient temp., stirred overnight; solvent removed under reduced pressure;	99%

3,5-dimethylphenyl iodide (22445-41-6) + boron triiodide (13517-10-7) → (3,5-dimethylphenyl)diiodoborane (30101-07-6)

Conditions	Yield
	98%

2,5-dimethyl-3,4-diiodo-thiophene (40197-05-5) + boron triiodide (13517-10-7) → 4,8-diiodo-1,3,5,7-tetramethyl-4H,8H-dithieno{3,4-b;3'-4'-e}-1,4-diborine (51926-17-1)

Conditions	Yield
byproducts: I2; stirring mixt. of educts at 80-85°C for 0.5 h; iodine removed by sublimation;	97%

boron triiodide (13517-10-7) + 1,1-bis(dichloroboryl)-2-phenylethane (337379-06-3) → 1,1-bis(diiodoboryl)-2-mesitylethane (337379-11-0)

Conditions	Yield
In neat (no solvent) byproducts: BCl3; all manipulations under Ar atm.; BCl2 compd. reacted with BI3 at room temp. for 12 h; volatiles evapd. in vac.;	97%

1,2,3-trimethyl-[1,3,2]diazaborolidine (29173-12-4) + boron triiodide (13517-10-7) → 1,2,3-trimethyl-1,3,2-diazaborolidine-1-boron triiodide (92067-09-9)

Conditions	Yield
In not given -78 °C; elem. anal.;	95%

boron triiodide (13517-10-7) + phosphorus trichloride (7719-12-2, 52843-90-0) → Cl3PBI3 (15194-85-1)

Conditions	Yield
In neat (no solvent) mixed (with stirring at -40°C), warmed (to -30°C); PCl3 removed (in vac.);	95%

1,2-diethyl-nido-carborane (80583-48-8) + boron triiodide (13517-10-7) → closo-1-iodo-2,3-diethyl-2,3-dicarbaheptaborane(7) (885333-58-4)

Conditions	Yield
With n-butyllithium In diethyl ether; hexane; toluene byproducts: LiI; under Ar or N2, 2 equiv. of nBuLi in hexane was added to Et2O soln. of B-compd. at -65 °C, stirring (4 h, room temp.), solvent was removed in vac., toluene was added, BI3 in toluene was added at -20 °C,stirring at room temp. overnight; volatiles were removed, residue was extd. with hexane, filtrate was dried in vac.;	95%

boron triiodide (13517-10-7) + bis(dichloroboryl)-1,1-propane → 1,1-bis(diiodoboryl)-n-propane + 2,4,6-triethyl-1,3,5-triiodo-1,3,5-triboracyclohexane

Conditions	Yield
In neat (no solvent) byproducts: BCl3, BICl2, BI2Cl; all manipulations under dry Ar or N2 atm.; mixt. of B compds. stirred atroom temp. for 1 h; volatiles evapd. in vac., EtCH(BI2)2 distd. at 90°C in high vac.,redistd. at 125-128°C in high vac., crystd. from hexane at 4. de gree.C for several d; by 13C NMR diastereomers obtained;	A n/a B 95%

Zr(η5-C5H3(SiMe3)2-1,3)Cl2 + boron triiodide (13517-10-7) → (Zr{C5H3(Si(CH3)3)2}2I2)

Conditions

Yield

In dichloromethane BI3 (8.95 mmol) in CH2Cl2 was added to a stirred soln. of (Zr(η-C5H3(SiMe3)2-1,3)2Cl2) (8.92 mmol) in CH2Cl2 during ca 10 min at 20°C; stirring was continued for ca 5 h, whereafter volatiles were removed in vacuo;; the solid residue was extd. into hexane; the extract was filtered and the filtrate concd. and cooled to ca -30°C to yield a powder, which was recrystd. twice and dried in vacuo; elem. anal.;;

94%

tribromo[(dimethylamino)ethoxycarbene]gold(III) (99654-10-1) + boron triiodide (13517-10-7) → [(dimethylamino)ethoxycarbene]triiodogold(III) (99654-11-2)

Conditions	Yield
In dichloromethane a CH2Cl2 soln. of BI3 was added at -30°C under N2 to a stirred soln. of Au-complex in CH2Cl2, mixt. was stirred for 1 h; soln. was concd., pentane added, ppt. washed with 1:1 ether-pentane forseveral times, recrystd. from CH2Cl2-pentane; elem. anal.;	94%

2,5-dimethyl-3,4-diiodo-thiophene (40197-05-5) + boron triiodide (13517-10-7) + sulfur (7704-34-9) → 1,3-diiodo-4,6-dimethyl-1H,3H-thieno{3,4c}-1,2,5-thiadiborol (51926-19-3)

Conditions	Yield
90-100°C; sublimation;	93%
90-100°C; sublimation;	93%

ferrocene (102-54-5) + boron triiodide (13517-10-7) → (ferrocenyl)diiodoborane

Conditions	Yield
In carbon disulfide byproducts: HI; boiled for 5 h using back-flow; filtering and concd. by evapn. at -20°C;	92%
In benzene byproducts: HI, {HFe(C5H5)2}BI4; equimolar amts. of BBr3 and ferrocene in boiling benzene, 10°C;;
In carbon disulfide byproducts: HI; equimolar amts. of BBr3 and ferrocene in boiling CS2;;

{μ-bis(2,6-diisopropylphenyl)imidazolin-2-imino(AlH2)}2 (1571095-88-9) + boron triiodide (13517-10-7) → {μ-bis(2,6-diisopropylphenyl)imidazolin-2-iminoAlI2}2 (1571096-09-7)

Conditions	Yield
In toluene at -78 - 0℃; for 18h; Inert atmosphere; Schlenk technique;	92%

selenium (7782-49-2) + boron triiodide (13517-10-7) → 2,5-diiodo-1,3,4,2,5-triselenadiborolane (17515-25-2)

Conditions	Yield
byproducts: iodine; 3 h heating at 210°C; elimination of iodine at 100°C/0.1 Torr; distn.;	91%
byproducts: iodine; 3 h heating at 210°C; elimination of iodine at 100°C/0.1 Torr; distn.;	91%
byproducts: iodine; 1.5 h mixing at 140°C; elimination of iodine at 100°C/0.1 Torr; distn.;	70%

4-tolyl iodide (624-31-7) + boron triiodide (13517-10-7) → 4-CH3C6H4BI2 (27545-47-7)

Conditions	Yield
byproducts: I2; in 30 min at 110°C; I2 sublimated off at 60-70°C/1 Torr; distn.;	91%

bis(pentamethylcyclopentadienyl)titanium dichloride (11136-36-0) + boron triiodide (13517-10-7) → Cp(*)2TiI2

Conditions	Yield
In dichloromethane dropwise addn. of BI3 in CH2Cl2 to a soln. of Ti-compd. (under N2 or Ar) with stirring, further stirring for 15 min at room temp.; removal of solvent under vac.;	90%

1-Chloro-4-iodobenzene (637-87-6) + boron triiodide (13517-10-7) → (4-chlorophenyl)diiodoborane (30101-14-5)

Conditions	Yield
	90%

dichlorobis(η5-methylcyclopentadienyl)titanium(IV) (1282-40-2) + boron triiodide (13517-10-7) → bis(η-methylcyclopentadienyl)diiodotitanium(IV) (72622-33-4)

Conditions	Yield
In dichloromethane byproducts: BCl3; dropwise addn. of BI3 to soln. of Ti complex (stirring), stirring (30 min); removal of volatiles (vac.), recrystn. (CHCl3); elem. anal.;	90%

boron triiodide (13517-10-7) + phosphorus tribromide (7789-60-8) → Br3PBI3 (15476-52-5)

Conditions	Yield
In carbon disulfide mixed (with stirring at -40°C), stirred (15 min); filtered, solv. removed (in vac. at room temp.);	90%

(AlH)6(AlN(CH3)3)2(CCH2CH2Si(CH3)3)6 (437626-20-5) + boron triiodide (13517-10-7) → (AlI)6(AlN(CH3)3)2(CCH2CH2Si(CH3)3)6 (723296-29-5)

Conditions	Yield
In toluene byproducts: B2H6; under N2 or Ar; BI3 (2.5 equiv.) cooled to -196°C; soln. of Al compd. in toluene added; cooled to -78°C; stirred for 30 min; warmed slowly to room temp.; volatiles removed in vac.; dried in vac. at 50°C; elem. anal.;	90%

[(η5-tetramethylcyclopentadienyl)2HfCl2] (175447-42-4) + boron triiodide (13517-10-7) → [(η5-C5Me4H)2HfI2] (876295-91-9)

Conditions	Yield
In toluene (N2); stirring a mixt. of hafnium complex and boron compd. in toluene for 3 d at room temp.; evapn., washing with pentane, drying in vac.; elem. anal.;	90%

trivinylphosphine (3746-01-8) + boron triiodide (13517-10-7) → trivinylphosphine-borontriiodide (566877-89-2)

Conditions	Yield
In hexane under N2 atm. to soln. Vi3P in hexane soln. BCl3 in hexane was added at -50°C; ppt. was filtered, washed with hexane, and dried in vacuo, crystn. from CH2Cl2; elem. anal.;	89%

bis(pentamethylcyclopentadienyl)zirconium(IV) dichloride (54039-38-2) + boron triiodide (13517-10-7) → Cp'2ZrI2 (68209-12-1)

Conditions	Yield
In toluene stirring of a soln. of Cp'2ZrCl2 and BI3 in toluene (25°C, 3 h, under Ar or N2); removal of volatiles (vac.), washing (pentane), drying (vac.); elem. anal.;	87%

(Cl2B)2CHC7H15 (154205-00-2) + boron triiodide (13517-10-7) → (I2B)2CHC7H15 (154205-02-4)

Conditions	Yield
In not given Ar atmosphere; excess of BI3;	87%

Upstream product

• 7681-82-5 sodium iodide 
• 7553-56-2 iodine 
• 19287-45-7 diborane 
• 7440-69-9 bismuth 
• 10034-85-2 hydrogen iodide 
• 10294-34-5 boron trichloride 
• 10294-33-4 boron tribromide 
• 13842-56-3 boron monoiodide 
• 12185-09-0 phosphorus 
• 7637-07-2 boron trifluoride 
• 7784-23-8 aluminium(III) iodide 
• 20436-27-5 (monoiodo)diborane⁽⁶⁾ 
• 21931-14-6 (iodo)selenoborane 
• 13845-21-1 triiodo borthiine 

Downstream Products

• 7704-34-9 sulfur 
• 17933-09-4 dimethyl iodoborane 
• 13775-36-5 B₂S₃*3H₂S 
• 40679-95-6 ioddithioboric acid 
• 39130-82-0 iodothioboric acid 
• 7637-07-2 boron trifluoride 
• 101974-17-8 B(CH₃)CCHCHCHCBrCNHB(CH₃)N(CCHCHCHCHCBr) 
• 19287-45-7 diborane 
• 17933-05-0 (diphenyl)iodoborane 
• 10294-34-5 boron trichloride 
• 17381-60-1 diiodophenylborane 
• 29162-85-4 1,3-dimethyl-2-iodo-1,3,2-diazaborolane 
• 4636-73-1 triethylammonium iodide 
• 7553-56-2 iodine 

Relevant articles and documents

Syntheses and structures of 1,3,5-trihalogeno-1,3,5-triboracyclohexane derivatives

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.

Crystal structure of boron triiodide, BI3

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.

Access to adducts of parent iminoborane isomers, HBNH and NBH2, using frustrated Lewis pair chelation

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