The present invention provides processes for the preparation of 3, 5-Dihydroxy-4-isopropyl-trans-stilbene or a salt or solvate thereof and novel intermediates used therein. In some embodiments the 3, 5-Dihydroxy-4-isopropyl-trans-stilbene is prepared from (E)-2-chloro-2-isopropyl-5-styrylcyclohexane-1,3-dione. Also disclosed are crystal forms of 3, 5-Dihydroxy-4-isopropyl-trans-stilbene or a salt or solvate thereof and pharmaceutical compositions comprising same.

The present invention provides processes for the preparation of 3, 5-Dihydroxy-4-isopropyl-trans-stilbene or a salt or solvate thereof and novel intermediates used therein. In some embodiments the 3, 5-Dihydroxy-4-isopropyl-trans-stilbene is prepared from (E)-2-chloro-2-isopropyl-5-styrylcyclohexane-1,3-dione. Also disclosed are crystal forms of 3, 5-Dihydroxy-4-isopropyl-trans-stilbene or a salt or solvate thereof and pharmaceutical compositions comprising same.

The present invention refers to aryl beta diketones of the formula (I)

##STR00001## wherein Y, R.sup.1, R.sup.2 and R.sup.3 have the meaning R.sup.1 is selected from the group consisting of hydrogen, C.sub.1-C.sub.4 alkyl, hydroxyl, methoxy, CF.sub.3 and F; R.sup.2 is selected from the group consisting of methyl and ethyl; R.sup.3 is selected from the group consisting of methyl and ethyl; and Y is a bivalent residue selected from the group consisting of C(O); CH.sub.2CH.sub.2C(O); CR.sup.IR.sup.IIC(O), wherein R.sup.I and R.sup.II are independently selected from hydrogen and methyl; and CHR.sup.IIICHR.sup.IVC(O), wherein R.sup.III and R.sup.IV are independently selected from hydrogen and methyl with the proviso, that R.sup.IIIR.sup.IV are hydrogen or either R.sup.III or R.sup.IV is methyl. The invention further refers to fragrance compositions and fragranced articles comprising them.

The present invention refers to aryl beta diketones of the formula (I)

##STR00001## wherein Y, R.sup.1, R.sup.2 and R.sup.3 have the meaning R.sup.1 is selected from the group consisting of hydrogen, C.sub.1-C.sub.4 alkyl, hydroxyl, methoxy, CF.sub.3 and F; R.sup.2 is selected from the group consisting of methyl and ethyl; R.sup.3 is selected from the group consisting of methyl and ethyl; and Y is a bivalent residue selected from the group consisting of C(O); CH.sub.2CH.sub.2C(O); CR.sup.IR.sup.IIC(O), wherein R.sup.I and R.sup.II are independently selected from hydrogen and methyl; and CHR.sup.IIICHR.sup.IVC(O), wherein R.sup.III and R.sup.IV are independently selected from hydrogen and methyl with the proviso, that R.sup.IIIR.sup.IV are hydrogen or either R.sup.III or R.sup.IV is methyl. The invention further refers to fragrance compositions and fragranced articles comprising them.

The present invention relates to symmetric tetraalkynylated anthracene and more particularly tetraethynylated compounds with Formula III. The invention also provides a tetrafold sonogashira route towards these of symmetric tetraethynylated anthracene compounds with Formula III. The compounds of the present invention show good to excellent synthetic yield and find application in sensors and optoelectronic devices and show positive solvatochrism and halochromism. The sensor uses symmetric tetraalkynylated anthracene as channel material and the sensor has high sensitivity of 19.95 percent to 900 ppm and 0.86 percent to 50 ppm.

The present invention relates to symmetric tetraalkynylated anthracene and more particularly tetraethynylated compounds with Formula III. The invention also provides a tetrafold sonogashira route towards these of symmetric tetraethynylated anthracene compounds with Formula III. The compounds of the present invention show good to excellent synthetic yield and find application in sensors and optoelectronic devices and show positive solvatochrism and halochromism. The sensor uses symmetric tetraalkynylated anthracene as channel material and the sensor has high sensitivity of 19.95 percent to 900 ppm and 0.86 percent to 50 ppm.

The present invention discloses a method for preparing optically active carbonyl compound, comprising the following steps: under the catalysis of chiral amine salt and transition metal catalysts, with hydrogen and catalytic amount of dihydropyridine compound as hydrogen source, use , -unsaturated aldehydes or , -unsaturated troponoid compounds to conduct asymmetric catalytic reaction to obtain the optically active carbonyl compound. This method comes in moderate reaction condition, simple operation, and catalytic amount of dihydropyridine compounds usage, the target product is easy to be separated and purified from the reaction system, and the metal catalyst can be recycled, it is economical.

The present invention discloses a method for preparing optically active carbonyl compound, comprising the following steps: under the catalysis of chiral amine salt and transition metal catalysts, with hydrogen and catalytic amount of dihydropyridine compound as hydrogen source, use , -unsaturated aldehydes or , -unsaturated troponoid compounds to conduct asymmetric catalytic reaction to obtain the optically active carbonyl compound. This method comes in moderate reaction condition, simple operation, and catalytic amount of dihydropyridine compounds usage, the target product is easy to be separated and purified from the reaction system, and the metal catalyst can be recycled, it is economical.

The present disclosure provides a catalyst system that is capable of selectively hydrogenating (2,3)/(4,5) and (2,3)/(5,6) dienones with hydrogen gas. Specifically, the present disclosure provides catalysts capable of providing high selectivity for the reduction even in the absence of catalyst poisons such as pyridine, pyrazine, quinoline, and quinoxaline

The present disclosure provides a catalyst system that is capable of selectively hydrogenating (2,3)/(4,5) and (2,3)/(5,6) dienones with hydrogen gas. Specifically, the present disclosure provides catalysts capable of providing high selectivity for the reduction even in the absence of catalyst poisons such as pyridine, pyrazine, quinoline, and quinoxaline