69.
(11) Patent number: 2146239
(46) Date of publication: 10.03.2000
(51) Int. Cl.7: C 07 C 46/06, 50/04, 50/08, 50/28
(21) Application number: 96114169/04
(22) Application date: 16.07.1996
(71) Applicant:
Institut khimii i khimiko-metallurgicheskikh protsessov SO RAN
(72) Inventor:
Bidman T.A.,
Pashkov G.L.
(73) Proprietor:
Institut khimii i khimiko-metallurgicheskikh protsessov SO RAN
(98) Mail address:
660049, Krasnojarsk, ul.K.Marksa, 42, Institut khimii i khimiko-metallurgicheskikh protsessov, Patentnyj otde
(54) METHOD OF PREPARING 4-ALKYL-OR 3-BROMO-5-ALKYL-1,2 BENZOQUINONES
(57)
FIELD: organic chemistry, more particularly synthesis of 4-alkyl-ortho-benzoquinones and 3-bromo-5-alkyl-ortho-benzoquinones. SUBSTANCE: disclosed is method of preparing above-mentioned compounds of formula I: wherein X is H or Br; R is tert--C4 H9 -tert--C5 H11 ; tert--C6 H13 ; cyclo--C6 H11 by oxidation of corresponding pyrochatechine, 4-alkylpyrocatechine or 3- bromo-5-alkylpyrocachetin in diethyl ether is stirred in excess amount of 10% aqueous solution of ferric- trichloride at room temperature, water is separated and ferric trichloride is once again added. EFFECT: simplified process, cheaper initial materials, higher process rate and higher yield of the desired products and wider range of the desired products. 1 ex, 1 tbl.
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