Patent ID: 11884643
Assignee: BAYER AKTIENGESELLSCHAFT
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  A | IPC A  C

Claim 11:
12. A compound of formula (XXIIa):, wherein
R1 and R2 are identical and are a bromine atom or a chlorine atom;
R3 is a fluorine atom, a chlorine atom, a bromine atom, an iodine atom or a methyl; and
U1a is a hydroxy group or a C1-C6-alkoxy group;
provided that R3 is not a chlorine atom when R1 and R2 are chlorine atoms; and
provided that the compound of formula (XXIIa) does not represent:
methyl 4,5-dichloro-3-fluorothiophene-2-carboxylate [2166596-88-7],
4,5-dichloro-3-fluorothiophene-2-carboxylic acid [2166596-87-6],
ethyl 4,5-dibromo-3-fluorothiophene-2-carboxylate [2260624-98-2],
4,5-dibromo-3-fluorothiophene-2-carboxylic acid [1628447-64-2],
methyl 4,5-dibromo-3-chlorothiophene-2-carboxylate [1501789-47-4],
4,5-dibromo-3-iodothiophene-2-carboxylic acid [854626-46-3],
4,5-dibromo-3-chlorothiophene-2-carboxylic acid [503308-99-4],
ethyl 4,5-dibromo-3-chlorothiophene-2-carboxylate [503308-98-3],
methyl 4,5-dibromo-3-fluorothiophene-2-carboxylate [395664-58-1],
tert-butyl 3,4,5-tribromothiophene-2-carboxylate [62224-27-5],
ethyl 3,4,5-tribromothiophene-2-carboxylate [54113-44-9],
3,4,5-tribromothiophene-2-carboxylic acid [53317-05-8],
methyl 3,4,5-tribromothiophene-2-carboxylate [24647-80-1],
ethyl 4,5-dibromo-3-methylthiophene-2-carboxylate [2088257-63-8],
4,5-dichloro-3-methylthiophene-2-carboxylic acid [854626-34-9],
4,5-dibromo-3-methylthiophene-2-carboxylic acid [854626-32-7],
methyl 4,5-dichloro-3-methylthiophene-2-carboxylate [854626-27-0], and
methyl 4,5-dibromo-3-methylthiophene-2-carboxylate [648412-53-7].