Methyllithium, molecular weight: 21.9755, flash point: 5°F, density: 0.85g/mL (20/4°C), stable under normal temperature and pressure, colorless, transparent to slightly yellow liquid, resistant to air and water It is extremely sensitive and can ignite spontaneously in the air. Insoluble in hydrocarbon solvents; soluble in ether solvents; reacts with water and other protic solvents to generate methane. It is generally used as an alkaline reagent and reducing agent for allene synthesis. A-light ketone is converted into cis-diol, etc. Methyl lithium can also methylate a variety of functional groups, can remove protective groups, and synthesize other methylated organometallic reagents, which can be used as bases and reduce transition metals, etc. .