The present invention relates to a process for reacting chemical compounds comprising the step of reacting a compound of formula (IV) wherein Hal is independently selected from CI or Br, and X is a monovalent anion, in the presence of an inorganic acid, wherein the aqueous inorganic acid has a concentration of at least about 60%, at a temperature of about 140 C. to Cabout 250 C., to obtain a compound of formula (V) wherein Hal is as defined above.

##STR00001##

The present invention relates to a process for reacting chemical compounds comprising the step of reacting a compound of formula (IV) wherein Hal is independently selected from CI or Br, and X is a monovalent anion, in the presence of an inorganic acid, wherein the aqueous inorganic acid has a concentration of at least about 60%, at a temperature of about 140 C. to Cabout 250 C., to obtain a compound of formula (V) wherein Hal is as defined above.

##STR00001##

The present invention relates to a process for providing a compound of formula (I): ##STR00001##
wherein Hal is a halogen, the process comprising the step of: reacting a compound of formula (II) ##STR00002##
wherein Hal is defined as above, with an alkali metal sulfite of the formula X.sub.2SO.sub.3 and an alkali metal hydroxide of the formula YOH, wherein X and Y are independently selected from an alkali metal.

The present invention relates to a process for providing a compound of formula (I): ##STR00001##
wherein Hal is a halogen, the process comprising the step of: reacting a compound of formula (II) ##STR00002##
wherein Hal is defined as above, with an alkali metal sulfite of the formula X.sub.2SO.sub.3 and an alkali metal hydroxide of the formula YOH, wherein X and Y are independently selected from an alkali metal.

The present invention relates to a process for providing a compound of formula (IV):

##STR00001##

wherein R.sup.1 and R.sup.2 are each independently C.sub.1-C.sub.4 alkyl, and Hal is independently Cl or Br, the process comprising the steps of: (i) reacting a compound of formula (II)

##STR00002##

wherein R.sup.1 and Hal is defined as above, to obtain a compound of formula (III)

##STR00003##

wherein R.sup.1 and Hal is defined as above, and (ii) reacting the compound of formula (III) to obtain the compound of formula (IV).

The present invention relates to a process for providing a compound of formula (IV):

##STR00001##

wherein R.sup.1 and R.sup.2 are each independently C.sub.1-C.sub.4 alkyl, and Hal is independently Cl or Br, the process comprising the steps of: (i) reacting a compound of formula (II)

##STR00002##

wherein R.sup.1 and Hal is defined as above, to obtain a compound of formula (III)

##STR00003##

wherein R.sup.1 and Hal is defined as above, and (ii) reacting the compound of formula (III) to obtain the compound of formula (IV).