Boronic Acid - Boronic Acids

Boronic Acids

Many air-stable boronic acids are commercially available. They are characterised by high melting points. Since boronic acids easily lose water to form the cyclic trimeric anhydride, commercial material oftentimes contains substantial quantities of this anhydride. This does not affect reactivity.

Boronic acid R Molar mass CAS number Melting point °C
Phenylboronic acid Phenyl 121.93 98-80-6 216–219
2-Thienylboronic acid Thiophene 127.96 6165-68-0 138–140
Methylboronic acid Methyl 59.86 13061-96-6 91–94
cis-Propenylboronic acid propene 85.90 7547-96-8 65–70
trans-Propenylboronic acid propene 85.90 7547-97-9 123–127
Representative boronic acids

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