The present application provides, among other things, compounds and methods for metathesis reactions. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and/or stereoselectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and Z-selectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and E-selectivity. In some embodiments, provided technologies are particularly useful for preparing alkenyl fluorides. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-a. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-b.

The present application provides, among other things, compounds and methods for metathesis reactions. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and/or stereoselectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and Z-selectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and E-selectivity. In some embodiments, provided technologies are particularly useful for preparing alkenyl fluorides. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-a. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-b.

The present application provides, among other things, compounds and methods for metathesis reactions. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and/or stereoselectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and Z-selectivity. In some embodiments, the present disclosure provides methods for preparing alkenyl halide with regioselectivity and E-selectivity. In some embodiments, provided technologies are particularly useful for preparing alkenyl fluorides. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-a. In some embodiments, a provided compound useful for metathesis reactions has the structure of formula II-b.

A process for the preparation of 1-bromo-2,4,5-trifluorobenzene from 2,4,5-trifluoroaniline or sulfate salt thereof.

##STR00001##

##STR00002##

A process for the preparation of 1 ,2,4-trifluorobenzene from 2,4,5-trifluoroaniline and then converting into 1-bromo-2,4,5-trifluorobenzene.

A process for the preparation of 1-bromo-2,4,5-trifluorobenzene from 2,4,5-trifluoroaniline or sulfate salt thereof.

##STR00001##

##STR00002##

A process for the preparation of 1 ,2,4-trifluorobenzene from 2,4,5-trifluoroaniline and then converting into 1-bromo-2,4,5-trifluorobenzene.

Clean process for preparing a chloroformyl-substituted benzene by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process for preparing a polymer-grade chloroformyl-substituted benzene.

Clean process for preparing a chloroformyl-substituted benzene by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process for preparing a polymer-grade chloroformyl-substituted benzene.

Provided is an organic metal complex having a structure represented by the following general formula (1):
ML.sub.mL′.sub.n  (1)
where: M represents a metal atom selected from Ir, Pt, Rh, Os, and Zn; L and L′, which are different from each other, each represent a bidentate ligand; m represents an integer of 1 to 3 and n represents an integer of 0 to 2, provided that m+n is 3; a partial structure ML.sub.m represents a structure represented by the following general formula (2): ##STR00001##
and a partial structure ML′.sub.n represents a structure including a monovalent bidentate ligand.

Provided is an organic metal complex having a structure represented by the following general formula (1):
ML.sub.mL′.sub.n  (1)
where: M represents a metal atom selected from Ir, Pt, Rh, Os, and Zn; L and L′, which are different from each other, each represent a bidentate ligand; m represents an integer of 1 to 3 and n represents an integer of 0 to 2, provided that m+n is 3; a partial structure ML.sub.m represents a structure represented by the following general formula (2): ##STR00001##
and a partial structure ML′.sub.n represents a structure including a monovalent bidentate ligand.

Provided is an organic metal complex having a structure represented by the following general formula (1):
ML.sub.mL′.sub.n  (1)
where: M represents a metal atom selected from Ir, Pt, Rh, Os, and Zn; L and L′, which are different from each other, each represent a bidentate ligand; m represents an integer of 1 to 3 and n represents an integer of 0 to 2, provided that m+n is 3; a partial structure ML.sub.m represents a structure represented by the following general formula (2): ##STR00001##
and a partial structure ML′.sub.n represents a structure including a monovalent bidentate ligand.