The present invention relates to an improved method for preparing acrolein cyanohydrins from hydrocyanic acid and the corresponding acroleins. The method is characterized in that the acrolein cyanohydrins obtained have a very low hydrocyanic acid content or are free of hydrocyanic acid and are therefore particularly well suited as intermediates for the synthesis of glufosinates.

The present invention relates to an improved method for preparing acrolein cyanohydrins from hydrocyanic acid and the corresponding acroleins. The method is characterized in that the acrolein cyanohydrins obtained have a very low hydrocyanic acid content or are free of hydrocyanic acid and are therefore particularly well suited as intermediates for the synthesis of glufosinates.

Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide, are provided. Also provided are compounds of Formula III, Formula VII, and IV, wherein R.sup.1 is a C.sub.1-C.sub.6 alkyl, X is Cl or OH, Y is halogen, OH, or OR.sup.2, and R.sup.2 is a C.sub.1-C.sub.6 alkyl. ##STR00001##

Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide, are provided. Also provided are compounds of Formula III, Formula VII, and IV, wherein R.sup.1 is a C.sub.1-C.sub.6 alkyl, X is Cl or OH, Y is halogen, OH, or OR.sup.2, and R.sup.2 is a C.sub.1-C.sub.6 alkyl. ##STR00001##

The present invention relates to a non-aqueous electrolyte additive, and a non-aqueous electrolyte for a lithium secondary battery including the same and a lithium secondary battery, and particularly, to a non-aqueous electrolyte additive having a nitrile group and a propargyl group, and a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery, which include the non-aqueous electrolyte additive so that capacity and cycle lifespan characteristics at high temperature can be improved.

The present invention relates to fields of organic chemistry and organometallic chemistry. The present invention discloses a chain multiyne compound, a preparation method thereof and an application in synthesizing a fused-ring metallacyclic compound. A structure of the chain multiyne compound in the present invention is shown as Formula I below. The present invention also provides a preparation method of the chain multiyne compound and an application thereof in a synthesis of a fused-ring metallacyclic compound. The chain multiyne compound disclosed in the present invention has multiple functional groups and the structure of the chain multiyne compound is adjustable. The chain multiyne compound can also be used to synthesize the fused-ring metallacyclic compound efficiently. The preparation method of the chain multiyne compound disclosed in the present invention is simple, which can be used to prepare the chain multiyne compound rapidly and efficiently.

##STR00001##

The present invention relates to fields of organic chemistry and organometallic chemistry. The present invention discloses a chain multiyne compound, a preparation method thereof and an application in synthesizing a fused-ring metallacyclic compound. A structure of the chain multiyne compound in the present invention is shown as Formula I below. The present invention also provides a preparation method of the chain multiyne compound and an application thereof in a synthesis of a fused-ring metallacyclic compound. The chain multiyne compound disclosed in the present invention has multiple functional groups and the structure of the chain multiyne compound is adjustable. The chain multiyne compound can also be used to synthesize the fused-ring metallacyclic compound efficiently. The preparation method of the chain multiyne compound disclosed in the present invention is simple, which can be used to prepare the chain multiyne compound rapidly and efficiently.

##STR00001##

An electrolyte including one or more nitrile benzoquinone compounds, and the nitrile benzoquinone compound is selected from the group consisting of the compounds represented by formula I, formula II, and formula III: ##STR00001##
The substituents R.sub.1 to R.sub.9 are each independently selected from the group consisting of hydrogen, a C.sub.2 to C.sub.12 ether group, a C.sub.1 to C.sub.12 alkoxy group, halogen, a C.sub.1 to C.sub.12 alkyl group, a C.sub.2 to C.sub.12 alkenyl group, a C.sub.2 to C.sub.12 alkynyl group, and a C.sub.6 to C.sub.26 aryl group. The electrolyte can form a stable protective film on a cathode, thereby increasing the cycle capacity retention rate and high temperature storage performance of an electrochemical device.

An electrolyte including one or more nitrile benzoquinone compounds, and the nitrile benzoquinone compound is selected from the group consisting of the compounds represented by formula I, formula II, and formula III: ##STR00001##
The substituents R.sub.1 to R.sub.9 are each independently selected from the group consisting of hydrogen, a C.sub.2 to C.sub.12 ether group, a C.sub.1 to C.sub.12 alkoxy group, halogen, a C.sub.1 to C.sub.12 alkyl group, a C.sub.2 to C.sub.12 alkenyl group, a C.sub.2 to C.sub.12 alkynyl group, and a C.sub.6 to C.sub.26 aryl group. The electrolyte can form a stable protective film on a cathode, thereby increasing the cycle capacity retention rate and high temperature storage performance of an electrochemical device.

A fluorine-containing ether compound represented by the following formula. R.sup.1CH.sub.2R.sup.2[CH.sub.2R.sup.2CH.sub.2R.sup.2].sub.xCH.sub.2R.sup.4 (x is an integer of 1 or 2; R.sup.2 is a perfluoropolyether chain; at least one of x pieces of R.sup.3's is Formula (2-1) or Formula (2-2); and R.sup.1 and R.sup.4 are each a terminal group having two to four polar groups, has 1 to 9 carbon atoms in a shortest distance between carbon atoms to which adjacent polar groups are bonded, and has an oxygen atom bonded to a methylene group to which R.sup.2 is bonded)

##STR00001##