Preparation of nitrogen fertilizers from oxalate esters prepared

Details Preparation of nitrogen fertilizers from oxalate esters prepared Preparation of nitrogen fertilizers from oxalate esters prepared

1980-06-30

1983-04-12

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

260396R, 560204, 564135, 564136, 568753, 568772, C07C 6936, C07C 6736

Patent

active

043799396

ABSTRACT:
A process for the preparation of nitrogen fertilizers, especially oxamide, either indirectly, or directly from oxalate esters, including the regeneration of the quinone oxidant utilized in the formation of the above esters.
Preparation of oxalate esters as potential intermediates for nitrogen fertilizers by the oxidative carbonylation of alcohols with carbon monoxide in the presence of a catalytic amount of a platinum group metal salt with or without a corresponding metal oxidant salt and an optionally substituted quinone (substituted or unsubstituted 2,5-cyclohexadiene-1,4-dione). High yields of isolated dialkyl oxalates are obtained by regulating temperature and carbon monoxide pressure and by maintaining essentially anhydrous conditions. In addition, high yields of the hydroquinones (1,4-dihydroxybenzenes) are recovered.

REFERENCES:
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Fenton et al. II, J. Org. Chem., vol. 39, No. 5, pp. 701-704, (1974).

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