阅读说明：本技术 特定的脱氢方法(i) (Specific dehydrogenation process (I) ) 是由 维尔纳·邦拉蒂 马克-安德烈·米勒 贝蒂娜·乌斯特伯格 于 2020-04-03 设计创作，主要内容包括：本发明涉及特定化合物的新的脱氢方法。(The present invention relates to a novel process for the dehydrogenation of specific compounds.)

1. A process for the preparation of a compound of formula (II),

wherein the content of the first and second substances,

r is-CH ═ O or-COOR ', wherein R' is-C₁-C₁₆Alkyl (preferably-CH)₃or-CH₂CH₃or-C₁₅H₃₁)，

Said process being carried out by selective dehydrogenation of a compound of formula (I),

wherein the content of the first and second substances,

r has the same meaning as in the compound of formula (II),

wherein the dehydrogenation is carried out in the presence of at least one oxidation reactant of formula (III),

wherein the content of the first and second substances,

R₁is-CN, -Cl or-F,

R₂is-CN, -ClOr a group of the formula-F,

R₃is-H, -CH₃-Cl or-F, and

R₄is-H, -CH₃-Cl or-F.

2. The process of claim 1, wherein the oxidizing reactant is selected from compounds of formula (IIIa), formula (IIIb), and formula (IIIc):

3. the process of claim 1, wherein the oxidizing reactant is a compound of formula (IIIc):

4. the process according to any one of the preceding claims, wherein the amount of oxidizing reactant of formula (III) is from 0.5 to 5 molar equivalents (relative to the compound of formula (II)).

5. The process according to any one of the preceding claims, wherein the process is carried out in the presence of at least one additive compound.

6. The process of claim 5, wherein the additive compound is selected from pyridine, butylhydroxytoluene, hydroquinone, and triethoxy amine.

7. A process according to claim 5 or claim 6, wherein the additive compound is added in an amount of 0.001 to 1 molar equivalent (relative to the compound of formula (II)).

8. The process according to any one of the preceding claims, wherein the process is carried out in the presence of at least one inert solvent.

9. The method of claim 8, wherein the solvent is an aromatic solvent.

10. The process according to any one of the preceding claims, wherein the process is carried out at a temperature of from 0 ℃ to 120 ℃.

11. A compound of the formula (Ia),

12. a compound of the formula (Ib),

13. a compound of the formula (Ic),