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Showing papers on "Benzopyran published in 1970"


Journal ArticleDOI
TL;DR: In boiling acetic anhydride o-formylphenylacetic acid is partly dehydrated to benzopyran-3-one (λmax. 441 nm), which forms appropriate adducts with dienophiles as mentioned in this paper.
Abstract: In boiling acetic anhydride o-formylphenylacetic acid is partly dehydrated to benzopyran-3-one (λmax. 441 nm.), which forms appropriate adducts with dienophiles. In sulphuric acid o-formylphenylacetic acid is completely converted into the conjugate acid of benzopyran-3-one. Experiments leading to 1-methyl-benzopyran-3-one, the more stable 1-phenyl derivative, and their conjugate acids are described.

11 citations


Patent
08 Jan 1970
TL;DR: In this article, the authors describe the preparation of 1.4-OXO-9-HYDROXY-7-(3-METHYL - 2 - OCTYL)-1,2,3,4-TETRAHYDROCYCLOPENTA(C)(1)BENZOPYRAN, USED AS AN INTERMEDIATE IN THE PREPARATION OF 1.2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 13-HEXAHYDR
Abstract: 4-OXO-9-HYDROXY-7-(3-METHYL - 2 - OCTYL)-1,2,3,4-TETRAHYDROCYCLOPENTA(C)(1)BENZOPYRAN, USED AS AN INTERMEDIATE IN THE PREPARATION OF 1,2,3,4-TETRAHYDROCYCLOPENTA(C)(1)BENZOPYRANS AND 1,2,3,4,12,13-HEXAHYDROCYCLOPENTA(C)(1)BENZOPYRANS WHICH HAVE C.N.S. ACTIVITY.

7 citations


Journal ArticleDOI
TL;DR: The role of metal-ligand σ-bonding in one of the complexes is discussed in this paper, and the interconvertible iron carbonyl complexes of the pyrone are prepared by reaction with dodecacarbonyltri-iron.
Abstract: 1,4-Diphenyl-2-benzopyran-3-one is prepared by dehydration–rearrangement of 1,3-dihydroxy-1,3-diphenyl-indian-2-one and by dehydration of o-benzoylphenyl(phenyl)acetic acid. The reactions of the pyrone and its conversion into related o-quinonoid compounds are described. The interconvertible iron carbonyl complexes of the pyrone are prepared by reaction with dodecacarbonyltri-iron. The role of metal–ligand σ-bonding in one of the complexes is discussed.

7 citations


Patent
16 Nov 1970
TL;DR: A chromogenic compound of normally colorless form is disclosed which is colorable to forms such as orange-red or red when brought into reactive contact with an acidic material.
Abstract: A chromogenic compound of normally colorless form is disclosed which is colorable to forms such as orange-red or red when brought into reactive contact with an acidic material. Examples of these chromogenic compounds include 6''-diethylamino-2''thiomethylfluoran, 6''-diethylamino-2'',3''-methylenedioxyfluoran or 9-ethylamino-spiro(12-H-benzo (1) xanthene-12, 1''-phthalide).

3 citations