One-pot production of carbamates using solid catalysts

摘要

The invention relates to the production of carbamates in a single reactor (one-pot) using solid catalysts, involving the reaction between at least one nitro compound, an organic carbonate of formula (OR)(OR′)C═O, a gas selected from hydrogen gas and a mixture of gases containing hydrogen and hydrogen precursor compounds, and a catalyst that has at least one metallic oxide and can also contain an element of groups 8, 9, 10 and 11 of the periodical table. The carbonates obtained can be transformed into their corresponding isocyanates.

主权项

1. A one pot method for preparing carbamates in a single reactor, comprising a reaction between at least:
a nitro compound, an organic carbonate of the formula (OR)(OR′)C═0 wherein R and R′ are each independently selected from substituted alkyl groups having between 1 to 20 carbon atoms, substituted aryl groups and non-substituted aryl groups, or R and R′ are identical and selected from methyl and ethyl, a gas selected from hydrogen gas, and a mixture of gases containing hydrogen and hydrogen precursor compounds, and a catalyst selected from CeO2, TiO2, Au/CeO2, interior gold nanoparticles-exterior palladium nanoparticles supported on TiO2 in anatase phase, a metal from group 10 or 11 supported on CeO2 or TiO2, and an alkali metal supported on Au/CeO2.