4VCl2

4VCl2, also known as vanadium(II) chloride, is a chemical compound composed of vanadium and chlorine. It is a dark green solid that is highly reactive and sensitive to air and moisture. The compound is typically prepared by the reduction of vanadium(V) chloride (VCl5) with hydrogen gas or by the reaction of vanadium metal with chlorine gas.

Vanadium(II) chloride is a Lewis acid, meaning it can accept electron pairs from Lewis bases. It is often used as a catalyst in organic synthesis, particularly in the reduction of carbonyl compounds. It is also used in the preparation of other vanadium compounds and as a reducing agent in various chemical reactions.

The compound is toxic and should be handled with care. It can cause skin and eye irritation, and inhalation of its dust can lead to respiratory problems. Proper safety measures, including the use of personal protective equipment, should be taken when handling 4VCl2.