Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novartis AG
BASF Schweiz AG
Original Assignee
Ciba Geigy AG
Ciba AG
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Filing date
Publication date
Priority claimed from CH94066Aexternal-prioritypatent/CH481980A/en
Application filed by Ciba Geigy AG, Ciba AGfiledCriticalCiba Geigy AG
Publication of ES336019A1publicationCriticalpatent/ES336019A1/en
Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems
(AREA)
Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur
(AREA)
Abstract
Procedure for the preparation of dioxacin dyes of the formula ** (See formula) ** in which Λ means an o-arylenic radical; R1 signifies a heterocyclic radical; Y R2 means a heterocyclic radical or an aryl radical, characterized by subjecting a 3,6-bis- (aroylamino) -1,4-benzoquinone of the formula ** (See formula) ** in which R1 and R2 have the meaning stated above, while A1 means an aryl radical which, in the ortho position relative to the imino group, preferably has an ether group, to a ring closure operation, which leads to dioxakines. (Machine-translation by Google Translate, not legally binding)
ES336019A1966-01-251967-01-24Procedure for the preparation of dioxacinic dyes. (Machine-translation by Google Translate, not legally binding)
ExpiredES336019A1
(en)
A procedure for the preparation of a 1,2 alpha-methylen -6,7 alpha-dihalometilen-20-espirox-4-eno 3-oxygenate. (Machine-translation by Google Translate, not legally binding)