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CAS No.: | 593-90-8 |
---|---|
Name: | TRIMETHYLBORON |
Article Data: | 145 |
Molecular Structure: | |
Formula: | C3H9 B |
Molecular Weight: | 55.9155 |
Synonyms: | Trimethylborane;Trimethylboron |
EINECS: | 209-816-3 |
Density: | 0.559 g/cm3 |
Melting Point: | -161,5°C |
Boiling Point: | 20 °C at 760 mmHg |
Flash Point: | °C |
Appearance: | colorless gas |
Hazard Symbols: | F,C |
Risk Codes: | 11-17-34 |
Safety: | The gas ignites spontaneously in air or when mixed with chlorine. When heated to decomposition it emits acrid smoke and irritating fumes. See also BORANES and BORON COMPOUNDS. |
PSA: | 0.00000 |
LogP: | 1.37060 |
Conditions | Yield |
---|---|
at 130.0°C, 74.1 Torr equilibrium; | A 99.6% B 99.6% |
at 130.0°C, 74.1 Torr equilibrium; | A 99.6% B 99.6% |
at 54.8°C, 57.6 Torr equilibrium; | A 90.8% B 90.8% |
at 54.8°C, 57.6 Torr equilibrium; | A 90.8% B 90.8% |
Triisopropyl borate
methyllithium
B
trimethylborane
C
diisopropoxymethylborane
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether under N2; to cold (-78 °C) soln. of boron compd. in Et2O slowly added MeLi, stirred for 0.5 h, warmed to room temp., stirred for 0.5 h,Li(BMe4) detected by (11)B NMR, cooled to 0 °C, added soln. of HCl in Et2O, stirred for 15 min, warmed; not isolated, monitored by (11)B NMR; | A 1% B <1 C 98% |
tri-sec-butylborate
methyllithium
B
CH3B(OCH(CH3)CH2CH3)2
C
trimethylborane
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether under N2; to cold (-78 °C) soln. of boron compd. in Et2O slowly added MeLi, stirred for 0.5 h, warmed to room temp., stirred for 0.5 h,Li(BMe4) detected by (11)B NMR, cooled to 0 °C, added soln. of HCl in Et2O, stirred for 15 min, warmed; not isolated, monitored by (11)B NMR; | A 1% B 98% C <1 |
triisobutyl borate
methyllithium
B
CH3B(OCH2CH(CH3)2)2
C
trimethylborane
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether under N2; to cold (-78 °C) soln. of boron compd. in Et2O slowly added MeLi, stirred for 0.5 h, warmed to room temp., stirred for 0.5 h,Li(BMe4) detected by (11)B NMR, cooled to 0 °C, added soln. of HCl in Et2O, stirred for 15 min, warmed; not isolated, monitored by (11)B NMR; | A 1% B 98% C <1 |
methyllithium
2,4,4,5,5-pentamethyl-[1,3,2]dioxaborolane
A
(CH3)2BOC(CH3)2C(CH3)2OH
B
trimethylborane
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether byproducts: LiCl; 1 equiv of MeLi slowly adding to a soln. of the boronic ester at -78°C, stirring for 3 h at the same temp., 1 equiv of anhydrous HCl in Et2O adding, warming to room temp., stirring for 15 min; the content was detd. by (11)B NMR spectrum; | A 98% B <1 |
trimethyl-borane; compound with trimethylamine
A
trimethylborane
B
trimethylamine
Conditions | Yield |
---|---|
at 111.3°C, 64.5 Torr equilibrium; | A 96% B 96% |
at 111.3°C, 64.5 Torr equilibrium; | A 96% B 96% |
at 65.8°C, 47.5 Torr equilibrium; | A 63.8% B 63.8% |
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether byproducts: LiCl, 2-propanol; 2 equiv of MeLi slowly adding to a soln. of the boronic ester at -78°C, stirring for 3 h at the same temp., 1 equiv of anhydrous HCl in Et2O adding, warming to room temp., stirring for 15 min; the content was detd. by (11)B NMR spectrum; | A 95% B <1 |
With hydrogenchloride In diethyl ether byproducts: LiCl, 2-propanol; 1 equiv of MeLi slowly adding to a soln. of the boronic ester at -78°C, stirring for 3 h at the same temp., 1 equiv of anhydrous HCl in Et2O adding, warming to room temp., stirring for 15 min; the content was detd. by (11)B NMR spectrum; | A 95% B <1 |
methyllithium
2-methyl-[1,3,2]dioxaborinane
A
(CH3)2BO(CH2)3OH
B
trimethylborane
Conditions | Yield |
---|---|
With hydrogenchloride In diethyl ether byproducts: LiCl; 2 equiv of MeLi slowly adding to a soln. of the boronic ester at -78°C, stirring for 3 h at the same temp., 1 equiv of anhydrous HCl in Et2O adding, warming to room temp., stirring for 15 min; the content was detd. by (11)B NMR spectrum; | A 92% B <7 |
bis[tert-butyl(dimethylboryl)amino]methylphosphanoxide
A
trimethylborane
B
1,3-di-tert-butyl-2,4-dimethyl-1,3,2,4-diazaphosphaboretidine-2-oxide
Conditions | Yield |
---|---|
In neat (no solvent) heating at 160-170°C for 5 h in a stream of N2 with condensationof the volatiles in a trap cooled at -78°C;; distn.; elem. anal.;; | A 88% B 75% |
Conditions | Yield |
---|---|
In diethyl ether at room temp. for 2 h, molar ratio BCl3:ether:MeMgBr01:2:3; by fractional condensation; | 87% |
In diethyl ether at room temp. for 2 h, molar ratio BCl3:ether:MeMgBr01:2:3; by fractional condensation; | 87% |