Abstract: The present invention relates to a new and efficient process for preparing 5-amino-1-(2,6-dichloro-4-(trifluo-romethyl)phenyl)-4-(trifluoromethylthio)-IH-pyrazole-3-carbonitrile (hereinafter referred to as compound of formula I), which is useful as an intermediate for the antiparasitic agent fipronil, and a process for preparing 5-amino-3-cyano-1-(2,6-dichloro-4-tri-fluoromethylphenyl)-4-trifluoromethyl sulfinylpyrazole (hereinafter referred to as compound of formula II or fipronil). In one aspect, there is provided a process for preparing fipronil comprising: a) a step of reacting CF3S(?O)ONa with the compound of formula (III) in the presence of a reducing/halogenating agent; and b) a step of oxidizing the compound of formula (I) obtained in step a) in the presence of a selective oxidizing agent, under suitable conditions, wherein the selective oxidizing agent selectively effects oxidation of (I) to the corresponding sulfoxide, Fipronil.

Abstract: The present invention provides a paperboard furniture, which is composed of composite paperboards comprising at least a corrugated board and paper stock covered thereon. The paperboard furniture contains a loading faceplate and a supporting rack for the loading faceplate. The supporting rack enables a plurality of composite paperboards to be assembled crosswise. The loading faceplate and supporting rack are mated by connecting. A connecting slot and troughing portion are formed at the bottom of the loading faceplate, whilst connecting portion and fins are formed on the supporting rack for mating with the connecting slot and troughing portion.

Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compound can perform as a superior catalyst in an asymmetric addition reaction of organic metal compounds and aldehyde. According to the present invention, the aminothiol compound is needed only less than 0.02% based on main reactants to obtain enantioselectivity higher than 98% enantiomeric excess, whereby the asymmetric reactions can become very economic.

Abstract: The present invention discloses an acylated derivative of an aminothiol compound having a general formula II wherein R1-R4 and R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, only less than 0.02% of the acylated derivative is needed to obtain high enantioselectivity over 99% enantiomeric excess.

Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, the compounds is needed only less than 0.02% of main reactants to obtain enantioselectivity higher than 99% enantiomeric excess, whereby the asymmetric reactions can become very economic.

Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compound can perform as a superior catalyst in an asymmetric addition reaction of organic metal compounds and aldehyde. According to the present invention, the aminothiol compound is needed only less than 0.02% based on main reactants to obtain enantioselectivity higher than 98% enantiomeric excess, whereby the asymmetric reactions can become very economic.

Abstract: The present invention discloses an acylated derivative of an aminothiol compound having a general formula II wherein R1-R4 and R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, only less than 0.02% of the acylated derivative is needed to obtain high enantioselectivity over 99% enantiomeric excess.

Abstract: The present invention discloses aminothiol compounds and acylated derivatives thereof, which respectively have general formula I and formula II wherein R1-R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, the compounds is needed only less than 0.02% of main reactants to obtain enantioselectivity higher than 99% enantiomeric excess, whereby the asymmetric reactions can become very economic.