Molybdenum(V) Chloride-Triphenylphosphine


[10241-05-1]  · Cl5Mo  · Molybdenum(V) Chloride-Triphenylphosphine  · (MW 273.19) (PPh3)

[603-35-0]  · C18H15P  · Molybdenum(V) Chloride-Triphenylphosphine  · (MW 262.30)

(carbon dioxide insertion;2 cyclic carbonate preparation; Lewis acid catalysis)

Physical Data: see Molybdenum(V) Chloride and Triphenylphosphine.

Solubility: MoCl5: sol most organic solvents. PPh3: sol Et2O, CHCl3, and most common organic solvents; slightly sol EtOH; insol H2O.

Form Supplied in: MoCl5: green-black solid; widely available. PPh3: white crystalline solid; widely available.

Handling, Storage, and Precautions: MoCl5 is air- and moisture-sensitive and somewhat corrosive. Ph3P is fairly air-stable, but is slowly converted to its oxide, Ph3PO, upon prolonged exposure. Ph3P can be recrystallized from Et2O. Use in a fume hood.

Cyclic Carbonates.

Molybdenum(V) chloride-triphenylphosphine (1:5) catalyzes the insertion of CO2 into methyloxirane to afford the cyclic carbonate of propane-1,2-diol in 78% yield (eq 1). The reaction proceeds at room temperature and 1 atm CO2 pressure. Other Lewis acids can be used in place of MoCl5, although the molybdenum reagent is the most efficient.1 Previously reported catalytic processes required elevated CO2 pressure (5-200 atm) and temperature (100-200 °C).2,3

1. Ratzenhofer, M.; Kisch, H. AG(E) 1980, 19, 317.
2. Koinuma, H.; Kato, H.; Hirai, H. CL 1977, 517.
3. Kuran, W.; Pasynkiewicz, S.; Skupinska, J. Makromol. Chem. 1976, 178, 47.

William E. Crowe

Emory University, Atlanta, GA, USA

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