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.

A liquid crystal composition is provided containing a first liquid crystal compound represented by formula (1): ##STR00001##
and a second liquid crystal compound represented by formula (2): ##STR00002## Also provided is a method for producing the liquid crystal composition having a desired wavelength dispersion characteristic.

A liquid crystal composition is provided containing a first liquid crystal compound represented by formula (1): ##STR00001##
and a second liquid crystal compound represented by formula (2): ##STR00002## Also provided is a method for producing the liquid crystal composition having a desired wavelength dispersion characteristic.

The present invention relates to monoterpenoid and phenylpropanoid containing derivative compounds, methods of making the compounds, compositions comprising the compounds, and methods of repelling pests using the compounds and/or compositions.

The present invention relates to monoterpenoid and phenylpropanoid containing derivative compounds, methods of making the compounds, compositions comprising the compounds, and methods of repelling pests using the compounds and/or compositions.

The present invention relates to a novel ligand for forming a ruthenium complex, a ruthenium complex catalyst, a production method therefor and a use thereof. The ligand for forming a ruthenium complex and the ruthenium complex catalyst, according to the present invention, exhibit high catalytic activity, high selectivity, and stability.

The present invention relates to a novel ligand for forming a ruthenium complex, a ruthenium complex catalyst, a production method therefor and a use thereof. The ligand for forming a ruthenium complex and the ruthenium complex catalyst, according to the present invention, exhibit high catalytic activity, high selectivity, and stability.

The disclosure relates to special orthoformic acid esters of formula (I), as defined herein, which can be used as thermally labile and acid-labile fragrance storage substances. The disclosure further relates to detergents and cleaning agents, cosmetic agents and air freshening products containing such orthoformic acid esters, as well as to a method for lastingly fragrancing surfaces.

The disclosure relates to special orthoformic acid esters of formula (I), as defined herein, which can be used as thermally labile and acid-labile fragrance storage substances. The disclosure further relates to detergents and cleaning agents, cosmetic agents and air freshening products containing such orthoformic acid esters, as well as to a method for lastingly fragrancing surfaces.