Disclosed are new classes of diphenol compounds, derived from tyrosol or tyrosol analogues and hydroxybenzoic acid, which are useful as monomers for preparation of biocompatible polymers. Also disclosed are biocompatible polymers prepared from these monomeric diphenol compounds, including novel biodegradable and/or bioresorbable polymers of formula. These biocompatible polymers or polymer compositions with enhanced bioresorbability and processibility are useful in a variety of medical applications, such as in medical devices and controlled-release therapeutic compositions. The invention also provides methods for preparing these monomeric diphenol compounds and biocompatible polymers. ##STR00001##

Disclosed are new classes of diphenol compounds, derived from tyrosol or tyrosol analogues and hydroxybenzoic acid, which are useful as monomers for preparation of biocompatible polymers. Also disclosed are biocompatible polymers prepared from these monomeric diphenol compounds, including novel biodegradable and/or bioresorbable polymers of formula. These biocompatible polymers or polymer compositions with enhanced bioresorbability and processibility are useful in a variety of medical applications, such as in medical devices and controlled-release therapeutic compositions. The invention also provides methods for preparing these monomeric diphenol compounds and biocompatible polymers. ##STR00001##

The present invention provides new classes of phenol compounds, including those derived from tyrosol and analogues, useful as monomers for preparation of biocompatible polymers, and biocompatible polymers prepared from these monomeric phenol compounds, including novel biodegradable and/or bioresorbable polymers. These biocompatible polymers or polymer compositions with enhanced bioresorbabilty and processibility are useful in a variety of medical applications, such as in medical devices and controlled-release therapeutic formulations. The invention also provides methods for preparing these monomeric phenol compounds and biocompatible polymers.

The present invention provides new classes of phenol compounds, including those derived from tyrosol and analogues, useful as monomers for preparation of biocompatible polymers, and biocompatible polymers prepared from these monomeric phenol compounds, including novel biodegradable and/or bioresorbable polymers. These biocompatible polymers or polymer compositions with enhanced bioresorbabilty and processibility are useful in a variety of medical applications, such as in medical devices and controlled-release therapeutic formulations. The invention also provides methods for preparing these monomeric phenol compounds and biocompatible polymers.

This invention relates to the use of polycarboxylic acid compounds, aqueous compositions comprising the same, cosmetic compositions comprising the same, in particular, hair care compositions, and their use for the treatment of hair, and a process for the treatment of hair comprising the use of said cosmetic compositions.

A quaternary ammonium salt of formula (I): wherein X is a linking group; Y is O, NH or NR.sup.1 wherein R.sup.1 is H or an optionally substituted hydrocarbyl group; Q.sup.+ is a moiety that includes a quaternary ammonium cation; A.sup. is an anion; R.sup.2 is an optionally substituted alkylene group; R.sup.3 is hydrogen or an optionally substituted hydrocarbyl group; and n is 0 or a positive integer; provided that n is not 0 when R.sup.3 is hydrogen.

##STR00001##

A highly effective catalyst for the preparation of diethyl oxalate using carbon monoxide using Pd/-Al.sub.2O.sub.3 and CeO.sub.2 as a promoter. High conversion rates with greatly extended catalyst life is achieved with the CeO.sub.2-enhanced Pd catalysts. The catalysts can be used for the production of high-value diethyl oxalate, and eventually ethylene glycol, from coal-derived syngas.

A highly effective catalyst for the preparation of diethyl oxalate using carbon monoxide using Pd/-Al.sub.2O.sub.3 and CeO.sub.2 as a promoter. High conversion rates with greatly extended catalyst life is achieved with the CeO.sub.2-enhanced Pd catalysts. The catalysts can be used for the production of high-value diethyl oxalate, and eventually ethylene glycol, from coal-derived syngas.

Processes for producing a disubstituted oxalate are disclosed. The process includes contacting a cesium salt with one or more alcohols and carbon dioxide (CO.sub.2) under reaction conditions sufficient to produce a composition comprising a disubstituted oxalate.

Processes for producing a disubstituted oxalate are disclosed. The process includes contacting a cesium salt with one or more alcohols and carbon dioxide (CO.sub.2) under reaction conditions sufficient to produce a composition comprising a disubstituted oxalate.