Molybdenum dichloride dioxide

Molybdenum dichloride dioxide is the inorganic compound with the formula MoO2Cl2. It is a yellow solid that is used as a precursor to other molybdenum compounds. It is a nonmolecular solid but is often encountered as its adducts MoO2Cl2(ether)2, which are soluble in organic solvents. It is one of several oxychlorides of molybdenum.

Molybdenum dichloride dioxide
Identifiers
ECHA InfoCard 100.157.480
Properties
Cl2MoO2
Molar mass 198.85 g·mol−1
Appearance yellow or cream solid
Melting point 298 °C (568 °F; 571 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

The compound is most easily prepared by treatment molybdenum trioxide with concentrated hydrochloric acid:[1]

MoO3 + 2 HCl → MoO2Cl2 + H2O

MoO2Cl2 can also be prepared from MoOCl4:[2]

MoOCl4 + O(Si(CH3)3)2 → MoO2Cl2 + 2 ClSi(CH3)3

It is also prepared by chlorination of molybdenum dioxide:[3]

MoO2 + Cl2 → MoO2Cl2

Reactions

MoO2Cl2 forms a variety of adducts, e.g. MoO2Cl2(thf)2. With bulky anilines, it converts to the diimido complex MoCl2(NAr)2(dimethoxyethane). This complex is the precursor to the Schrock carbenes of the type Mo(OR)2(NAr)(CH-t-Bu).[3]

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References
  1. Francisco J. Arnaiz (1997). "Dichlorodioxobis(Dimethylsulphoxide) Molybdenum(VI)". Inorganic Syntheses. 31: 246-7. doi:10.1002/9780470132623.ch39.CS1 maint: uses authors parameter (link)
  2. Gibson, V. C.; Kee, T. P.; Shaw, A. (1988). "New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2". Polyhedron. 7 (7): 579–80. doi:10.1016/S0277-5387(00)86336-6.
  3. Schrock, R. R.; Murdzek, J. S.; Bazan, G. C.; Robbins, J.; DiMare, M.; O'Regan, M. (1990). "Synthesis of molybdenum imido alkylidene complexes and some Reactions Involving Acyclic Olefins". Journal of the American Chemical Society. 112: 3875–3886. doi:10.1021/ja00166a023.CS1 maint: uses authors parameter (link)
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