A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein base is added to the reactor while maintaining time to reach 95% homogeneity at no greater than 10 minutes.

A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein base is added to the reactor while maintaining time to reach 95% homogeneity at no greater than 10 minutes.

The invention relates to nanoporous gold nanoparticle catalysts formed by exposure of nanoporous gold to ozone at elevated temperatures, as well as methods for production of esters and other compounds.

The invention relates to nanoporous gold nanoparticle catalysts formed by exposure of nanoporous gold to ozone at elevated temperatures, as well as methods for production of esters and other compounds.

The invention relates to nanoporous gold nanoparticle catalysts formed by exposure of nanoporous gold to ozone at elevated temperatures, as well as methods for production of esters and other compounds.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein oxygen concentration at a reactor outlet is from 1 to 7.5 mol % and wherein pH at a reactor outlet is no greater than 7.5.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein oxygen concentration at a reactor outlet is from 1 to 7.5 mol % and wherein pH at a reactor outlet is no greater than 7.5.

Provided are a bisphenol represented by the general formula (1), a method for producing the bisphenol, and a polyarylate resin, a (meth)acrylate compound and an epoxy resin which are derived from the bisphenol. In the formula (1), R.sub.1 to R.sub.4 are the same or different, and each represent an alkyl group, an aryl group or a halogen atom, n.sub.1 and n.sub.2 are the same or different, and each represent an integer of 1 to 4, and k.sub.1 to k.sub.4 are the same or different, and each represent 0 or an integer of 1 to 4. When at least one of k.sub.1 to k.sub.4 is 2 or more, corresponding R.sub.1 to R.sub.4 may be the same or different.

Provided are a bisphenol represented by the general formula (1), a method for producing the bisphenol, and a polyarylate resin, a (meth)acrylate compound and an epoxy resin which are derived from the bisphenol. In the formula (1), R.sub.1 to R.sub.4 are the same or different, and each represent an alkyl group, an aryl group or a halogen atom, n.sub.1 and n.sub.2 are the same or different, and each represent an integer of 1 to 4, and k.sub.1 to k.sub.4 are the same or different, and each represent 0 or an integer of 1 to 4. When at least one of k.sub.1 to k.sub.4 is 2 or more, corresponding R.sub.1 to R.sub.4 may be the same or different.

The present invention relates to 2,3,7-Trimethyloct-6-enyl acetate and 3,7-dimethyl-2-methylene-oct-6-enyl acetate and derivatives thereof and their use as aroma chemicals.