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

Claim 7:
8. The process according to claim 6 further comprising the step(s) of:
(a) performing a diazotation of a compound of formula (XXIV) followed by an aromatic substitution:, wherein
R1, R2 and R3 are as recited in claim 6;
R4 is a hydrogen atom or C1-C6-alkyl; and
U19 is an amino group, a chlorine atom or a bromine atom and U20 is an amino group, a chlorine atom or a bromine atom;
provided that at least one of U19 or U20 is an amino group;
to provide a compound of formula (XXI) as recited in claim 6 when R 4 is a hydrogen atom;
(b) performing a hydrolysis of the compound obtained in step (a) when R4 is a C1-C6-alkyl to provide a compound of formula (XXI) as recited in claim 6.