Process for the preparation of oxethylmercaptobenzaldehydes and their oxidation products
First Claim
1. A process for the preparation of an oxethylmercaptobenzaldehyde of the formula (1) ##STR8## in which R denotes a hydrogen, fluorine, chlorine, bromine or iodine atom, m denotes the number 0, n denotes the number 1 or 2 and p denotes the number 0, and the side-chain --S(O)m --CH2 --CH2 --OH is in the ortho and para, or ortho or para position to the aldehyde group, which comprises condensing 1 mole of a halobenzaldehyde of the formula (II), ##STR9## in which R, X, Y and Z represent hydrogen, fluorine, chlorine, bromine or iodine atoms, with the proviso that R, X, Y and Z can be in total 1, 2 or 3 halogen atoms, where R is a halogen atom, if R, X, Y and Z together represent 3 halogen atoms, in aqueous medium with about 1.0 to 15 moles of mercaptoethanol, per halogen atom to be exchanged, in the presence of an acid-binding agent at a temperature of about 70°
- C. to about 150°
C., to give the corresponding oxethylmercaptobenzaldehyde.
1 Assignment
0 Petitions
Accused Products
Abstract
Process for the preparation of oxethylmercaptobenzaldehydes and their oxidation products of the formula (I) ##STR1## in which R denotes a hydrogen, fluorine, chlorine, bromine or iodine atom, m denotes the number 0 or 2, n denotes the number 1 or 2, and p denotes the number 0 or 1, with the proviso that p is 0 if m is 0, and the side-chain --S(0)m --CH2 --CH2 --OH is in the ortho and/or para position to the aldehyde or carboxyl group, can be prepared by condensing 1 mole of a halobenzaldehyde of the general formula (II) ##STR2## in which R, X, Y and Z represent hydrogen, fluorine, chlorine, bromine or iodine atoms, with the proviso that R, X, Y and Z can be in total 1, 2 or 3 halogen atoms, where R is a halogen atom if R, X, Y and Z together represent 3 halogen atoms, in aqueous medium with about 1.0 to 1.5 moles of mercaptoethanol (per halogen atom to be exchanged) in the presence of the acid-binding agents at or about 70° C. about 150° C., to give the oxethylmercaptobenzaldehydes and oxidizing these to give the oxethylsulfonylbenzoic acids using at least the amount of hydrogen peroxide necessary in each case at about 40° C. to about 110° C. in the presence of a tungsten(VI) compound as a catalyst.
5 Citations
12 Claims
-
1. A process for the preparation of an oxethylmercaptobenzaldehyde of the formula (1) ##STR8## in which R denotes a hydrogen, fluorine, chlorine, bromine or iodine atom, m denotes the number 0, n denotes the number 1 or 2 and p denotes the number 0, and the side-chain --S(O)m --CH2 --CH2 --OH is in the ortho and para, or ortho or para position to the aldehyde group, which comprises condensing 1 mole of a halobenzaldehyde of the formula (II), ##STR9## in which R, X, Y and Z represent hydrogen, fluorine, chlorine, bromine or iodine atoms, with the proviso that R, X, Y and Z can be in total 1, 2 or 3 halogen atoms, where R is a halogen atom, if R, X, Y and Z together represent 3 halogen atoms, in aqueous medium with about 1.0 to 15 moles of mercaptoethanol, per halogen atom to be exchanged, in the presence of an acid-binding agent at a temperature of about 70°
- C. to about 150°
C., to give the corresponding oxethylmercaptobenzaldehyde. - View Dependent Claims (2, 3, 4)
- C. to about 150°
-
5. A process for the preparation of an oxethylsulfonylbenzaldehyde of the formula (I) ##STR10## in which R denotes a hydrogen, fluorine, chlorine, bromine or iodine atom, m denotes the number 2, n denotes the number 1 or 2, and p denotes the number 0, and the side-chain --S(O)m --CH2 --CH2 --OH is in the ortho and para, or ortho or para, position to the aldehyde group, which comprises condensing 1 mole of a halobenzaldehyde of the formula (II) ##STR11## in which R, X, Y and Z represent hydrogen, fluorine, chlorine bromine or iodine atoms with the proviso that R, X, Y and Z can be total 1, 2 or 3 halogen atoms, where R is a halogen atom is R, X, Y and Z together represent 3 halogen atoms, in aqueous medium with about 1.0 to 1.5 moles of mercaptoethanol, per halogen, atoms to be exchanged, in the presence of an acid-binding agent at a temperature of about 70°
- C. to about 150°
C., to give the corresponding oxethylmercaptobenzaldehyde and oxidizing this aldehyde to give the corresponding oxethylsulfonylbenzaldehyde with at least 2 moles of hydrogen peroxide per oxethylmercapto group at a pH<
5 at temperature of about 40°
C. to about 110°
C. in the present of a tungsten (VI) compound as a catalyst. - View Dependent Claims (6, 7, 8)
- C. to about 150°
-
9. A process for the preparation of an oxethylsulfonylbenzoic acid of the formula ##STR12## in which R denotes a hydrogen, fluorine, chlorine, bromine or iodine atom, m denotes the number 2, n denotes the number 1 or 2, and p denotes the number 1, and the side-chain --S(O)m --CH2 --CH2 --OH is in the ortho and para, or ortho or para position to the carboxyl group, which comprises condensing 1 mole of a halogenzaldehyde of the formula (II) ##STR13## in which R, X, y and Z represent hydrogen, fluorine, chlorine, bromine or iodine atoms, with the proviso that R, X, Y and Z can be total 1, 2 or 3 halogen atoms where R is a halogen atom is R, X, Y and Z together represent 3 halogen atoms, in aqueous medium with about 1.0 to 1.5 moles of mercaptoethanol, per halogen atom to be exchanged, in the presence of an acid-binding agent at temperatures of about 70°
- C. to about 150°
C., to give the corresponding oxethylmercpatobenzaldehyde and oxidizing this aldehyde to give the corresponding oxethylsulfonylbenzoic acid with at least 1 mole of hydrogen peroxide for the oxidation of the aldehyde group and at least 2 moles of hydrogen peroxide per oxethylmercapto group at a pH>
8 at temperatures of about 40°
C. to about 110°
C. in the presence of a tungsten (VI) compound as a catalyst. - View Dependent Claims (10, 11, 12)
- C. to about 150°
Specification