Use of a compound of Formula (I) in a nonaqueous battery electrolyte formulation (1) wherein R is a fluorinated alkyl group and X is selected from the group consisting of F, Cl, H, CF.sub.3, and C.sub.1 to C.sub.6 alkyl which may be at least partially fluorinated and —OR group can be cis- or trans- to any other group X.

##STR00001##

Use of a compound of Formula (I) in a nonaqueous battery electrolyte formulation (1) wherein R is a fluorinated alkyl group and X is selected from the group consisting of F, Cl, H, CF.sub.3, and C.sub.1 to C.sub.6 alkyl which may be at least partially fluorinated and —OR group can be cis- or trans- to any other group X.

##STR00001##

A method can produce a divinyl ether compound having an alkylene skeleton from an alkanediol and acetylene at a rapid production rate and a high reaction yield. In the production method, a compound of formula (1)

##STR00001##

wherein R.sup.1 is an alkylene group having 4 to 20 carbon atoms, may be reacted with acetylene in the presence of an alkali metal catalyst to produce a compound of formula (2)

##STR00002##

and the reaction may be performed in the absence of a solvent.

A method can produce a divinyl ether compound having an alkylene skeleton from an alkanediol and acetylene at a rapid production rate and a high reaction yield. In the production method, a compound of formula (1)

##STR00001##

wherein R.sup.1 is an alkylene group having 4 to 20 carbon atoms, may be reacted with acetylene in the presence of an alkali metal catalyst to produce a compound of formula (2)

##STR00002##

and the reaction may be performed in the absence of a solvent.

A method of purifying a divinyl ether compound having an alkylene skeleton may take place with low energy and in a simplified manner. Such a method for producing a divinyl ether compound may include: reacting a compound of formula (1)

##STR00001##

wherein R.sup.1 is an alkylene group having 4 to 20 carbon atoms, with acetylene by using an alkali metal catalyst; and purifying the divinyl ether compound of formula (2)

##STR00002##

which is obtained in the reacting, without an extraction.

A method of purifying a divinyl ether compound having an alkylene skeleton may take place with low energy and in a simplified manner. Such a method for producing a divinyl ether compound may include: reacting a compound of formula (1)

##STR00001##

wherein R.sup.1 is an alkylene group having 4 to 20 carbon atoms, with acetylene by using an alkali metal catalyst; and purifying the divinyl ether compound of formula (2)

##STR00002##

which is obtained in the reacting, without an extraction.

A method of purifying a divinyl ether compound having an alkylene skeleton may take place with low energy and in a simplified manner. Such a method for producing a divinyl ether compound may include: reacting a compound of formula (1)

##STR00001##

wherein R.sup.1 is an alkylene group having 4 to 20 carbon atoms, with acetylene by using an alkali metal catalyst; and purifying the divinyl ether compound of formula (2)

##STR00002##

which is obtained in the reacting, without an extraction.

To provide a method capable of easily and efficiently removing a 2-alkoxyethanol from a mixture containing the 2-alkoxyethanol and a (2-alkoxyethyl) vinyl ether while suppressing a decrease in the yield of (2-alkoxyethyl) vinyl ether. A method for removing a 2-alkoxyethanol, including the step of adding one or more azeotropic solvents selected from the group consisting of alkanes having 7 to 8 carbon atoms and cycloalkanes having 7 to 8 carbon atoms to a mixture containing the 2-alkoxyethanol represented by the following formula (1)
R—O—CH.sub.2CH.sub.2OH  (1) where R represents an alkyl group having 1 to 4 carbon atoms, and a (2-alkoxyethyl) vinyl ether represented by the following formula (2)
R—O—CH.sub.2CH.sub.2O—CH═CH.sub.2  (2) where R has the same meaning as R in the formula (1), and subjecting the resulting mixture to azeotropic distillation.

To provide a method capable of easily and efficiently removing a 2-alkoxyethanol from a mixture containing the 2-alkoxyethanol and a (2-alkoxyethyl) vinyl ether while suppressing a decrease in the yield of (2-alkoxyethyl) vinyl ether. A method for removing a 2-alkoxyethanol, including the step of adding one or more azeotropic solvents selected from the group consisting of alkanes having 7 to 8 carbon atoms and cycloalkanes having 7 to 8 carbon atoms to a mixture containing the 2-alkoxyethanol represented by the following formula (1)
R—O—CH.sub.2CH.sub.2OH  (1) where R represents an alkyl group having 1 to 4 carbon atoms, and a (2-alkoxyethyl) vinyl ether represented by the following formula (2)
R—O—CH.sub.2CH.sub.2O—CH═CH.sub.2  (2) where R has the same meaning as R in the formula (1), and subjecting the resulting mixture to azeotropic distillation.

To provide a method capable of easily and efficiently removing a 2-alkoxyethanol from a mixture containing the 2-alkoxyethanol and a (2-alkoxyethyl) vinyl ether while suppressing a decrease in the yield of (2-alkoxyethyl) vinyl ether. A method for removing a 2-alkoxyethanol, including the step of adding one or more azeotropic solvents selected from the group consisting of alkanes having 7 to 8 carbon atoms and cycloalkanes having 7 to 8 carbon atoms to a mixture containing the 2-alkoxyethanol represented by the following formula (1)
R—O—CH.sub.2CH.sub.2OH  (1) where R represents an alkyl group having 1 to 4 carbon atoms, and a (2-alkoxyethyl) vinyl ether represented by the following formula (2)
R—O—CH.sub.2CH.sub.2O—CH═CH.sub.2  (2) where R has the same meaning as R in the formula (1), and subjecting the resulting mixture to azeotropic distillation.