Provided is a method of manufacturing a trifluoropyruvyl fluoride dimer, including a reaction step of reacting hexafluoropropylene oxide and aldehyde.

Provided is a method of manufacturing a trifluoropyruvyl fluoride dimer, including a reaction step of reacting hexafluoropropylene oxide and aldehyde.

The present invention relates to a method for producing a 1,3-dioxolane compound represented by formula 1, the method containing step (a), in which hexafluoroacetone monohydrate is brought into contact with a metal fluoride, step (b), in which fluorine gas is brought into contact, and step (c), in which an olefin compound represented by formula 2 is brought into contact. In formulae 1 and 2, X.sup.1 to X.sup.4 each independently represent a hydrogen atom, fluorine atom, chlorine atom, or trifluoromethyl group.

##STR00001##

The present invention relates to a method for producing a 1,3-dioxolane compound represented by formula 1, the method containing step (a), in which hexafluoroacetone monohydrate is brought into contact with a metal fluoride, step (b), in which fluorine gas is brought into contact, and step (c), in which an olefin compound represented by formula 2 is brought into contact. In formulae 1 and 2, X.sup.1 to X.sup.4 each independently represent a hydrogen atom, fluorine atom, chlorine atom, or trifluoromethyl group.

##STR00001##

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).

##STR00001##

In the formula, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, a C(O)OR.sup.4 group, or the like, and R.sup.1 and R.sup.2 may be bonded to each other to form a ring structure. R.sup.3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R.sup.4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a C(O) group, an S(O) group, an S(O).sub.2 group, an S(O).sub.2R.sup.5S(O).sub.2 group or a CR.sup.6R.sup.7 group, R.sup.5 represents an alkylene group having 1 to 4 carbon atoms, and each of R.sup.6 and R.sup.7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).

##STR00001##

In the formula, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, a C(O)OR.sup.4 group, or the like, and R.sup.1 and R.sup.2 may be bonded to each other to form a ring structure. R.sup.3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R.sup.4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a C(O) group, an S(O) group, an S(O).sub.2 group, an S(O).sub.2R.sup.5S(O).sub.2 group or a CR.sup.6R.sup.7 group, R.sup.5 represents an alkylene group having 1 to 4 carbon atoms, and each of R.sup.6 and R.sup.7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The present disclosure provides, for example, a method that can produce a fluorolactone compound from hexafluoropropylene oxide or the like in a single step. The present disclosure relates to a method for producing a compound represented by formula (1): ##STR00001## wherein two R.sup.1 are the same and each is a fluorine atom or a fluoroalkyl group, the method comprising step A of reacting a compound represented by formula (2): ##STR00002## wherein R.sup.1 is as defined above, with a compound represented by formula (3): ##STR00003## wherein R.sup.31, R.sup.32, and R.sup.33 are the same or different and each is a hydrogen atom or an alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents, and a compound represented by formula (4-1) or the like: ##STR00004## wherein R.sup.41, R.sup.42, R.sup.43, and R.sup.44 are the same or different and each is a hydrogen atom ox an alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents.

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).

##STR00001##

In the formula, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, a C(O)OR.sup.4 group, or the like, and R.sup.1 and R.sup.2 may be bonded to each other to form a ring structure. R.sup.3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R.sup.4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a C(O) group, an S(O) group, an S(O).sub.2 group, an S(O).sub.2R.sup.5S(O).sub.2 group or a CR.sup.6R.sup.7 group, R.sup.5 represents an alkylene group having 1 to 4 carbon atoms, and each of R.sup.6 and R.sup.7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

This invention relates to methods for preparing a sodium-glucose transporter 2 (SGLT2) inhibitor, a cocrytalline SGLT2 and (S)-5-oxopyrrolidine-2-carboxylic acid (L-PGA) complex, and intermediates useful in the preparation of the said SGLT2 inhibitor.

This invention relates to methods for preparing a sodium-glucose transporter 2 (SGLT2) inhibitor, a cocrytalline SGLT2 and (S)-5-oxopyrrolidine-2-carboxylic acid (L-PGA) complex, and intermediates useful in the preparation of the said SGLT2 inhibitor.