Fluorenone

About: Fluorenone is a research topic. Over the lifetime, 1067 publications have been published within this topic receiving 17162 citations. The topic is also known as: Diphenylene ketone & 9-Oxofluorene.

Oxidation catalyst and oxidation method using the same

Abstract: PROBLEM TO BE SOLVED: To obtain a target oxidized compound with a high rate of reaction conversion and selectivity by oxidizing effectively a substrate with molecular oxygen under mild conditions SOLUTION: Under the presence of an oxidation catalyst consisting of an imido compound such as N-(9-fluorenyloxi) phthalimide represented by the formula or an oxidation catalyst consisting of a cooperating oxidizing agent including the imido compound and a transition metal compound, substrate, such as a cyclic compound is oxidized by being brought into contact with molecular oxygen, eg fluorenone is obtained from fluorene with a high conversion selectivity in the formula R and R are identical or different, and each represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, a cycloalkyl group, a hydroxyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group, and an acyl group, R and R may link with each other to form a double bond, or an aromatic or non-aromatic ring, R represents a ring group having tertiary carbon at the bonding site to an adjacent oxygen atom, and n represents an integer of 1-3

Persulphate oxidations. Part VII. Oxidation of o-benzyl- and o-benzoyl-benzamides

Abstract: Persulphate oxidation of o-benzylbenzamide gave mainly 2,2′-bibenzyl-αα′-diyldibenzamide, and smaller amounts of 3-phenylphthalide, 3-phenylphthalimidine, and related dimers. The initial oxidation occurs at the benzyl and not the amide group. Analogous products were obtained from the oxidation of o-benzylbenzoic acid. In both cases dimerisation at the benzylic position was suppressed by addition of copper(II) ions. Persulphate oxidation of o-benzoylbenzamide afforded phthalimide, fluorenone, and o-benzoylbenzoic acid.

Characterization of bisazo compounds employing ultrafast spectroscopy

Abstract: Fluorenone-based bisazo compounds with different substituents have been investigated in various organic solvents and in a solid state by means of absorption, fluorescence and picosecond time-resolved absorption pump–probe spectroscopy. The bisazo compounds were found to coexist in azo–enol and hydrazone–quinone (HQ) tautomeric forms. Absorption spectra of the two forms were determined and excited-state properties were characterized. The azo–enol tautomeric form has a short, of tens of ps, excited-state lifetime and shows strong excited-state absorption, whereas stimulated emission is weak or absent. The HQ tautomeric form has a longer excited-state lifetime and shows sizeable stimulated emission. The main spectroscopic features of bisazo molecules in a solid state are similar to those in solutions, however, the excited-state relaxation is influenced by the specific solid phase effects. The lifetimes of the HQ form molecules in solutions differ by more than 10 times for bisazo compounds with different substituents and correlate with the photosensitivity of xerographic layers based on these compounds.

Use of scavengers for the removal of impurities from inert fluids

Abstract: Disclosed are macroreticulate polymers which are useful in scavenging Lewis acid and oxidant impurities from inert fluids. The macroreticulate polymers of this invention contain a plurality of metallated functional groups or mixtures of metallated functional groups where the function groups correspond to the general formula: where Ar is an aromatic hydrocarbon radical containing from one to three rings; R is selected from the group consisting of alkyl hydrocarbon radicals, benzophenone radicals, salts of benzophenone, fluorenone radicals and salts of fluorenone; and M is selected from the group consisting of lithium, potassium, sodium, alkyl magnesium, and alkyl zinc. Impurities are readily removed from such inert fluids by contacting the fluids with the macroreticulate polymer and then separating the fluids from the scavenger.

Novel Fused and Spiro Heterocyclic Compounds Derived from 4-(4-Amino-5-Mercapto-4H-1,2,4-Triazol-3-yl)Phthalazin-1(2H)-One

Abstract: Some new fused heterocyclic systems such as 1,2,4-triazolo[3,4-b]1,3,4-thiadiazoles and 1,3,4-thiadiazines were synthesized through the reaction of the starting material 4-(4-amino-5-mercapto-4 H -1,2,4-triazol-3-yl)phthalazin-1(2 H )-one with triethyl orthoformate, furoyl chloride, thiophene-2-aldehyde, phenylisothiocyanate, chloro acetonitrile, and p-nitro- w -bromo-acetophenone. Also spiro systems were achieved from reaction of the starting compound with isatine, and fluorenone. The newly synthesized 1,3,4-thiadiazoles and 1,3,4-thiadiazines were obtained in good yields and their structures were elucidated by spectral data and elemental analysis.