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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