Provided is a production method whereby corresponding carboxylic acid anhydrides and carboxylic acid esters can be obtained at high yield from various carboxylic acids even without a solvent and near room temperature. A method for producing a carboxylic acid anhydride represented by formula (II), the method comprising reacting a compound represented by formula (I) and a carboxylic acid in the presence of a Group II metal compound having an ionic ligand containing an oxygen atom. A method for producing a carboxylic acid ester, the method comprising reacting a carboxylic acid anhydride produced by the aforementioned method and an alcohol. In formula (I), R.sup.1 represents a C.sub.1-20 hydrocarbon group. In formula (II), R.sup.2 represents a C.sub.1-20 hydrocarbon group.

A method for preparing a salt of acetylsalicylic acid and a basic amino acid. A solution of acetylsalicylic acid and a solution of said basic amino acid are mixed in a reactor, at a temperature lower than or equal to 30 C. at atmospheric pressure. The mixture is created by simultaneously and progressively introducing the acetylsalicylic acid and the basic amino acid into the reactor in amounts that are always equimolar.

A method for preparing a salt of acetylsalicylic acid and a basic amino acid. A solution of acetylsalicylic acid and a solution of said basic amino acid are mixed in a reactor, at a temperature lower than or equal to 30 C. at atmospheric pressure. The mixture is created by simultaneously and progressively introducing the acetylsalicylic acid and the basic amino acid into the reactor in amounts that are always equimolar.

A method for preparing a salt of acetylsalicylic acid and a basic amino acid. A solution of acetylsalicylic acid and a solution of said basic amino acid are mixed in a reactor, at a temperature lower than or equal to 30 C. at atmospheric pressure. The mixture is created by simultaneously and progressively introducing the acetylsalicylic acid and the basic amino acid into the reactor in amounts that are always equimolar.

An aim of the present disclosure is to provide a method for producing a fluoroalkoxide, said method being more useful than conventional methods, and the like. The aim can be achieved by a method for producing a compound represented by the following formula (1): ##STR00001##
(wherein R.sup.1 is a fluoroalkyl group optionally containing an oxygen atom between carbon atoms, or a fluoroalkoxy group optionally containing an oxygen atom between carbon atoms, and
each R.sup.2 is identical to or different from each other and is a hydrocarbon group),
the method comprising the step of reacting a compound represented by the following formula (2): ##STR00002## with a compound represented by the following formula (3):
.sup.F.sup.NR.sup.2).sub.4(3).

An aim of the present disclosure is to provide a method for producing a fluoroalkoxide, said method being more useful than conventional methods, and the like. The aim can be achieved by a method for producing a compound represented by the following formula (1): ##STR00001##
(wherein R.sup.1 is a fluoroalkyl group optionally containing an oxygen atom between carbon atoms, or a fluoroalkoxy group optionally containing an oxygen atom between carbon atoms, and
each R.sup.2 is identical to or different from each other and is a hydrocarbon group),
the method comprising the step of reacting a compound represented by the following formula (2): ##STR00002## with a compound represented by the following formula (3):
.sup.F.sup.NR.sup.2).sub.4(3).

A compound represented by the following formula (1):

##STR00001##

wherein RG is a group containing at least one cyclic structure, I is an iodine atom, R.sup.1 is a monovalent functional group having 0 to 30 carbon atoms, containing no polymerizable unsaturated bond, and being optionally the same or different; n is an integer of 1 to 5, and m is an integer of 1 to 5.

A compound represented by the following formula (1):

##STR00001##

wherein RG is a group containing at least one cyclic structure, I is an iodine atom, R.sup.1 is a monovalent functional group having 0 to 30 carbon atoms, containing no polymerizable unsaturated bond, and being optionally the same or different; n is an integer of 1 to 5, and m is an integer of 1 to 5.

An aim of the present disclosure is to provide a method for producing a fluoroalkoxide, said method being more useful than conventional methods, and the like. The aim can be achieved by a method for producing a compound represented by the following formula (1):

##STR00001## (wherein R.sup.1 is a fluoroalkyl group optionally containing an oxygen atom between carbon atoms, or a fluoroalkoxy group optionally containing an oxygen atom between carbon atoms, and each R.sup.2 is identical to or different from each other and is a hydrocarbon group), the method comprising the step of reacting a compound represented by the following formula (2):

##STR00002## with a compound represented by the following formula (3):

##STR00003##

An aim of the present disclosure is to provide a method for producing a fluoroalkoxide, said method being more useful than conventional methods, and the like. The aim can be achieved by a method for producing a compound represented by the following formula (1):

##STR00001## (wherein R.sup.1 is a fluoroalkyl group optionally containing an oxygen atom between carbon atoms, or a fluoroalkoxy group optionally containing an oxygen atom between carbon atoms, and each R.sup.2 is identical to or different from each other and is a hydrocarbon group), the method comprising the step of reacting a compound represented by the following formula (2):

##STR00002## with a compound represented by the following formula (3):

##STR00003##