MOLYBDENUM(VI) DICHLORIDE DIOXIDE

 CAS Number 13637-68-8

·         Linear Formula MoO₂Cl₂

·         Molecular Weight 198.84

·          MDL number MFCD00014225

·          PubChem Substance ID 24863255

Both molybdenum(VI) dichloride dioxide (MoO₂Cl₂) and its dimethylformamide (DMF) complex catalyze the addition of alcohols to isocyanates giving carbamates. Most additions proceeded to completion at room temperature within 20 min using as little as 0.1 mol% of the catalyst when working on a 1-mmol scale or just 100 ppm working on a 20-mmol scale. Sterically encumbered substrates reacted to completion when 1 mol% of the catalyst was employed. 

Detailed description

Diols, triols, and tetraols reacted with monoisocyanates likewise, as did monofunctional alcohols and diisocyanates. These pairings furnished di-, tri-, tetra-, and dicarbamates, respectively. Reactants, which were poorly soluble in CH₂Cl₂ at room temperature required elevating the temperature and possibly choosing a higher-boiling solvent (ClCH₂CH₂Cl, DMF) as well. Additions of diols to diisocyanates were feasible, too, giving polycarbamates as we presume.

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