Boronic Esters (also Named Boronate Esters)
Boronic esters are esters formed between a boronic acid and an alcohol.
Compound | General formula | General structure |
---|---|---|
Boronic acid | RB(OH)2 |
|
Boronic ester | RB(OR)2 |
|
Comparison between boronic acids and boronic esters |
The compounds can be obtained from borate esters by condensation with alcohols and diols. Phenylboronic acid can be selfcondensed to the cyclic trimer called triphenyl anhydride or triphenylboroxin.
Boronic ester | Diol | Structural formula | Molar mass | CAS number | Boiling point (°C) |
---|---|---|---|---|---|
Allylboronic acid pinacol ester | pinacol | 168.04 | 72824-04-5 | 50–53 (5 mmHg) | |
Phenyl boronic acid trimethylene glycol ester | trimethylene glycol | 161.99 | 4406-77-3 | 106 (2 mm Hg) | |
Diisopropoxymethylborane | isopropanol | 144.02 | 86595-27-9 | 105 -107 | |
Representative boronic esters |
Compounds with 5-membered cyclic structures containing the C-O-B-O-C linkage are called dioxaborolanes and those with 6-membered rings dioxaborinanes.
Read more about this topic: Boronic Acid
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