Boronic Acid - Boronic Esters (also Named Boronate Esters)

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.

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