The present invention relates to the production of benzene derivatives from furfural and its derivatives. The present invention also relates to the preparation of novel intermediates derived from furfural and its derivatives. The present invention describes new routes for converting furfural and its derivatives into benzene derivatives including novel intermediates.

The present invention relates to the production of benzene derivatives from furfural and its derivatives. The present invention also relates to the preparation of novel intermediates derived from furfural and its derivatives. The present invention describes new routes for converting furfural and its derivatives into benzene derivatives including novel intermediates.

A preparation method for a trans-cyclobutane-o-dicarboxylic acid ester and a derivative thereof includes the following steps: in an organic solvent, catalyzing a substrate with a structure as shown in a structural formula I by using organic alkali at 50-90° C. so as to generate isomerization, acquiring the trans-cyclobutane-o-dicarboxylic acid ester or the derivative thereof, herein the structural formula I is as follows:

##STR00001##

Each R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently one of hydrogen or an alkyl of C.sub.1-C.sub.5, and each of R.sup.5 and R.sup.6 is independently one of alkyl of C.sub.1-C.sub.10 and benzyl.

A preparation method for a trans-cyclobutane-o-dicarboxylic acid ester and a derivative thereof includes the following steps: in an organic solvent, catalyzing a substrate with a structure as shown in a structural formula I by using organic alkali at 50-90° C. so as to generate isomerization, acquiring the trans-cyclobutane-o-dicarboxylic acid ester or the derivative thereof, herein the structural formula I is as follows:

##STR00001##

Each R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently one of hydrogen or an alkyl of C.sub.1-C.sub.5, and each of R.sup.5 and R.sup.6 is independently one of alkyl of C.sub.1-C.sub.10 and benzyl.

Herein is provided a process for producing renewable products, such as alkenes, from a feedstock of biological origin. The process includes subjecting a feedstock including fatty acid glycerides and optionally free fatty acids, wherein at least one hydrocarbon chain is unsaturated, to esterification reaction in the presence of an alcohol. The ester stream thereby obtained is then fractionated and a fraction including esters of unsaturated C18 fatty acids is subjected to metathesis conditions in the presence of an alkene to obtain metathesis products. Fractionation of the metathesis products includes recovery of at least renewable 1-decene, and unsaturated C10-C15 fatty acid esters.

Herein is provided a process for producing renewable products, such as alkenes, from a feedstock of biological origin. The process includes subjecting a feedstock including fatty acid glycerides and optionally free fatty acids, wherein at least one hydrocarbon chain is unsaturated, to esterification reaction in the presence of an alcohol. The ester stream thereby obtained is then fractionated and a fraction including esters of unsaturated C18 fatty acids is subjected to metathesis conditions in the presence of an alkene to obtain metathesis products. Fractionation of the metathesis products includes recovery of at least renewable 1-decene, and unsaturated C10-C15 fatty acid esters.

Herein is provided a process for producing renewable products, such as alkenes, from a feedstock of biological origin. The process includes subjecting a feedstock including fatty acid glycerides and optionally free fatty acids, wherein at least one hydrocarbon chain is unsaturated, to esterification reaction in the presence of an alcohol. The ester stream thereby obtained is then fractionated and a fraction including esters of unsaturated C18 fatty acids is subjected to metathesis conditions in the presence of an alkene to obtain metathesis products. Fractionation of the metathesis products includes recovery of at least renewable 1-decene, and unsaturated C10-C15 fatty acid esters.

A process for combined renewable 1-decene and renewable carboxylic diacid production from a fatty acid ester containing feedstock, wherein the feedstock is first subjected to metathesis reaction conditions, recovery of 1-decene and then to microbial oxidation to yield diacids in a fermentation broth. Diacids of unusual carbon chains lengths are thereby obtainable.

A process for combined renewable 1-decene and renewable carboxylic diacid production from a fatty acid ester containing feedstock, wherein the feedstock is first subjected to metathesis reaction conditions, recovery of 1-decene and then to microbial oxidation to yield diacids in a fermentation broth. Diacids of unusual carbon chains lengths are thereby obtainable.

A process for combined renewable 1-decene and renewable carboxylic diacid production from a fatty acid ester containing feedstock, wherein the feedstock is first subjected to metathesis reaction conditions, recovery of 1-decene and then to microbial oxidation to yield diacids in a fermentation broth. Diacids of unusual carbon chains lengths are thereby obtainable.