How is Tungsten(4+) tetrachloride (CAS: 13470-13-8) typically synthesized?

Tungsten(4+) tetrachloride is typically synthesized by reacting tungsten (W) or tungsten trioxide (WO3) with chlorine gas (Cl2) at elevated temperatures. The reaction is exothermic and requires careful control of temperature and pressure to achieve the desired yield and selectivity. Catalysts such as iron or copper can be used to improve the reaction rate and product purity.