Phenylboronic acids are organic compounds that combine a benzene ring with a boronic acid group and have unique chemical and physical properties. Among LC building blocks, they are known for their ability to form stable, ordered liquid crystal phases, often with enhanced thermal stability. These compounds can be used to make liquid crystal materials with specific optical properties, such as birefringence and dichroism, making them suitable for advanced display technologies. Their reactivity towards cross-linking reactions allows the preparation of LC networks with improved mechanical properties and stability. Phenylboronic acids can also be used in the synthesis of other LC compounds and in the modification of existing LC materials.