Preparation and Reactions
VCl3 is prepared by heating VCl4 at 160–170 °C under a flowing stream of inert gas, which sweeps out the Cl2. The bright red liquid converts to a crusty purple solid. Further heating of VCl3 decomposes with volatilization of VCl4, leaving VCl2. Upon heating under H2 at 675 °C (but less than 700 °C), VCl3 reduces to greenish VCl2.
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- 2 VCl3 + H2 → 2 VCl2 + 2 HCl
Vanadium trichloride catalyses the pinacol coupling reaction of benzaldehyde to 1,2-diphenyl-1,2-ethanediol by various reducing metals such as zinc:
- Zn + 2 H2O + 2 PhCHO → Ph2C2H2(OH)2 + Zn(OH)2
Read more about this topic: Vanadium(III) Chloride
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