(19)
(11)EP 0 258 682 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
23.08.1989 Bulletin 1989/34

(43)Date of publication A2:
09.03.1988 Bulletin 1988/10

(21)Application number: 87111488.0

(22)Date of filing:  08.08.1987
(51)International Patent Classification (IPC)4C07C 69/88, C07C 67/317, C07C 69/757
(84)Designated Contracting States:
CH DE FR GB LI NL

(30)Priority: 20.08.1986 EP 86111536

(71)Applicant: ROURE S.A.
F-95102 Argenteuil CEDEX (FR)

(72)Inventor:
  • Pelerin, Gérard
    F-06820 Cabris (FR)

(74)Representative: Urech, Peter, Dr. et al
F.Hoffmann-La Roche AG Patent Department (PLP), 124 Grenzacherstrasse
4070 Basel
4070 Basel (CH)


(56)References cited: : 
  
      


    (54)Process for the production of substituted benzoic acid esters


    (57) A process for the production of esters of the general formula

    in which R¹ signifies methyl or ethyl and R² and R³, independently from one another, signify C1-4-alkyl,
    is described.
    The process is characterized in subjecting a diketo ester of the formula

    in which R¹ to R³ have the above significances, and X is chloro or bromo, preferably chloro,
    to a dehydrohalogenation process.
    The compounds I are known odorants.





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