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

Claim 6:
7. The process according to claim 6 further comprising the steps of:
(a) reacting a compound of formula (XXII) with a compound of formula (XXIII) or a salt thereof:, wherein
R1, R2 and R3 are as recited in claim 6;
R4 is a hydrogen atom or C1-C6-alkyl; and
U1 is a halogen atom, a hydroxy group or a C1-C6-alkoxy group;
to provide a compound of formula (XXI) as recited in claim 6 when R4 is a hydrogen atom;
(b) performing an 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.