Examples of 'boron tribromide' in a sentence
Meaning of "boron tribromide"
Boron tribromide: Boron tribromide is a chemical compound used as a reagent in organic synthesis, particularly for converting alcohols to alkyl bromides.
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- A binary compound of boron and bromine, BBr₃; it is a strong Lewis acid.
How to use "boron tribromide" in a sentence
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boron tribromide
Similar results were obtained using boron tribromide.
The boron tribromide is added dropwise.
Preparation of a complex compound of boron tribromide and a tertiary amine.
For example an alkoxy substiuent can be convened to hydroxy using boron tribromide.
Treatment with boron tribromide in dichloromethane.
The dealkylation is preferably carried out with boron tribromide.
The methyl ether is deprotected with boron tribromide in a suitable organic solvent such as dichloromethane.
The terminal benzyl ester can be selectively cleaved using boron tribromide.
It was observed that the catalyst with the boron tribromide base produced a less exothermic reaction.
Boron tribromide is commercially available and is a strong Lewis acid.
Demethylation using boron tribromide.
Deprotection with boron tribromide under standard conditions gave the free phenolic sulfonamide in reasonable yield.
With aluminum chloride in acetonitrile or with boron tribromide in dichloromethane.
An additional 25 ml of boron tribromide were added and the mixture was again stirred overnight.
The methoxy groups of DMpillararene were deprotected using boron tribromide to give pillararene.
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The use of boron tribromide is particularly preferred, as described in the reported example.
Preferred is the herein described use of boron tribromide in DCM.
Alternatively, boron tribromide may be used.
Preferably, the boron halogeride is boron tribromide.
Use of boron tribromide to cleave the methyl ether linkages gives the parent compound 8.
A particularly suitable boron trihalide is, boron tribromide.
Deprotection with boron tribromide under standard conditions gave the free phenolic pyrazole 9 in good yield.
These compounds are demethylated using boron tribromide to produce naphthols 5.
Method according to claim 1, characterized in that the boron halogenide is boron tribromide.
Step 3 requires the reagent boron tribromide in dichloromethane.
De-methylation is preferably carried out in the presence of boron tribromide.
Among Lewis acids, boron tribromide is preferably used.
The process of claim 4 wherein the boron halide is boron tribromide.
Ten ml of boron tribromide in 10 ml of methylene chloride is added dropwise over 25 minutes.
Furthermore, this step can be carried out to be used boron tribromide.
As the Lewis acid, boron tribromide or aluminum trichloride may, for example, be used.
By dealkylation reagent, is preferably meant agents such as boron tribromide or aluminium chloride.
Additional boron tribromide ( 10 mL ) was added at room temperature.
The composition of claim 6, wherein said hydroxyl deprotecting agent is boron tribromide.
For example, the alkoxy may be cleaved with boron tribromide to form the hydroxy moiety.
The boron halides may include boron trifluoride, boron trichloride and boron tribromide.
The crude methyl ether was deprotected using boron tribromide in analogy to Example 85 step 4.
The method of claim 8 or claim 9, wherein said deprotecting agent is boron tribromide.
Two other 0.23 ml portions of boron tribromide solution are added, cooling for a further 7 hours.
The demethylation reagents include aluminum chloride-pyridine, boron tribromide or the like.
After 0.5h a further 4ml of boron tribromide solution was added and the mixture stirred for 1h.
The catechol is deprotected by treatment with a boron trihalide, preferably boron tribromide to give XI.
A 1M solution of boron tribromide in dichloromethane ( 24 ml ) was added dropwise.
When the group P1 is alkyl it is deprotected using boron tribromide.
A solution of 1 N boron tribromide in methylene chloride ( 5 mL ) was added dropwise.
Methoxymethyl derivative I was easily demethylated by using boron tribromide according to the Scheme 3.
Cooling the boron tribromide to -20°C facilitates its handling.
For example, Compound VI may be reacted with boron tribromide and chlorothiocarbamate.
Thus, the p-methoxypyrrolidone is converted to the p-hydroxy-pyrrolidone by treatment with boron tribromide.
Then, the formyl derivative ( XVII ) is reacted with boron tribromide to give a naphthol derivative ( XVIII ).
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Examples of using Boron
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Boron can be highly toxic to some plants
The percentage of boron in the fertilizer is given by
Boron is poorly mobile within the plant
Examples of using Tribromide
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Its structure resembles that of aluminium tribromide
The boron tribromide is added dropwise
The preferred brominating reagent is pyridinium tribromide
