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Direct Condensation of Carboxylic Acids With Alcohols Catalyzed by Hafnium(IV) Salts

Direct Condensation of Carboxylic Acids With Alcohols Catalyzed by Hafnium(IV) Salts

K Ishihara, S Ohara, H Yamamoto

Science. 2000 Nov 10;290(5494):1140-2.

PMID: 11073448

Abstract:

In order to promote atom efficiency in synthesis and to avoid the generation of environmental waste, the use of stoichiometric amounts of condensing reagents or excess substrates should be avoided. In esterification, excesses of either carboxylic acids or alcohols are normally needed. We show that the direct condensation of equimolar amounts of carboxylic acids and alcohols can be achieved with the use of hafnium(IV) salts, such as commercially available hafnium(IV) chloride and hafnium(IV) tert-butoxide. The present method can be applied to direct polyesterification and may be suitable for large-scale operations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2172023	Hafnium(IV) tert-butoxide		2172-02-3	Price

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