Lewis acids can be broadly classified into several types based on their structure and reactivity:
Metal Halides: These include compounds like AlCl3 and TiCl4, which are commonly used in industry. Organometallic Compounds: Compounds like AlMe3 (trimethylaluminum) are used in specialized organic reactions. Non-metallic Lewis Acids: Examples include BF3 and SiF4, which are often used in gas-phase reactions.