Mild and High-Yielding Molybdenum(VI) Dichloride Dioxide-Catalyzed Formation of Mono-, Di-, Tri-, and Tetracarbamates from Alcohols and Aromatic or Aliphatic Isocyanates
作者:Christian Stock、Reinhard Brückner
DOI:10.1002/adsc.201200303
日期:2012.8.13
to completion when 1 mol% of the catalyst was employed. 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
Exceptionally Active Catalysts for the Formation of Carbamates from Alcohols and Isocyanates: Molybdenum(VI) Dichloride Dioxide and Its DMF Complex
作者:Reinhard Brückner、Christian Stock
DOI:10.1055/s-0030-1258552
日期:2010.10
Small amounts of MoO 2 Cl 2 or MoO 2 Cl 2 (DMF) 2 catalyze carbamate formation from an alcohol and isocyanates: 0.1 mol% of the respective additive allow primary, secondary or tertiary alcohols to add to aliphatic or aromatic isocyanates of varied steric hindrance within 20 minutes at room temperature. Typically the corresponding carbamate resulted in 100% yield. Only particularly hindered substrates