Showing papers on "Fluorenone published in 1992"

Fluorenone thiosemicarbazone complexes of bivalent metalions

Abstract: New transition metal complexes of fluorenone thiosemicarbazone (FTsH) have been prepared and characterized by elemental analysis, magnetic moments and spectral studies. The CoII ion is oxidized to CoIII in the presence of the Schiff base, with the concomitant formation of [Co(FTs)3]. Based on the characterisational data, possible structures for the complexes are proposed.

Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene

Abstract: In the production of 9,9-bis-(4-hydroxphenyl)-fluorene by condensation by fluorenone and phenol in a molar ratio of 1:4 to 1:8 at 30° to 90° C. in the presence of gaseous hydrogen chloride and β-mercapto-propionic acid as catalyst, the improvement comprising mixing the completed reaction mixture with a polyalkylene glycol, distilling excess phenol from the mixture, and mixing the distillation residue with a solvent miscible with the polyalkylene glycol, recovering the crystallized product, suspending the crystallized product in water and heating the suspension to obtain highly pure 9,9-bis-(4-hydroxyphenyl)-fluorene as white crystals.

Process of making ketones

Abstract: Ketones are prepared by admixing at least one gem-dichloro compound with at least one acid such that the ketone wherein the keto-oxygen replaces the gem-dichloro group is formed. The reaction is exemplified by the reaction of 9,9-dichlorofluorene with an acid such that fluorenone is formed. This process has the advantage that no oxidizing agent is used.

Capsule ink composition

Abstract: PURPOSE:To obtain a UV- curing type composition containing a microcapsule, a specific ethylenic unsaturated compound and a photopolymerization initiator as basic components and capable of providing excellent color developing property when used for offset printing. CONSTITUTION:The objective composition obtained by blending (A) microcapsule obtained by subjecting an electron-donating color Producing agent such as diphenylmethane based dye, thiazine based dye or infrared ray developing dye to encapsulization in a state dissolved in oil such as paraffin or triarylmethane with (B) a compound [e.g. 2-phenoxyethyl (meth)acrylate]expressed by the formula [W is H or methyl, X and Y are H or either one of X and Y is H and the other is methyl; Z is (substituted)aryl; (n) is >=1] of 15-85wt.% (as solid content) based on total capsule ink composition and (C) photopolymerization initiator such as benzoquinone or fluorenone of 1-20 pts.wt. based on 100 pts.wt. component B and sensitizer, resin, etc., as other components.

Fluorenone and benzophenone 1,4-dihydropyridine derivatives with cardiodepressant activity.

Abstract: A series of fluorenone and benzophenone 1,4-dihydropyridine derivatives were prepared. The compounds were evaluated for inotropic, chronotropic and calcium antagonist properties.