How to synthesis of 9-Fluorenone-2-carboxylic acid CAS 784-50-9 by 2-Acetylfluorene

9-Fluorenone-2-carboxylic acid (784-50-9) 's Synthetic route

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Trinuclear tris(ansa-metallocene) complexes of zirconium and hafnium for olefin polymerization

Jende, Lars N. Vantomme, Aurelien Welle, Alexandre Brusson, Jean-Michel Carpentier, Jean-Fran?ois Kirillov, Evgueni

New platforms for trinuclear complexes, 1,3,5-tris(fluoren-2-yl-R)benzene (Ph{2-Flu^RH}₃; R = H (2a), 6-^tBu (2b), 7-^tBu (2c), Tet (2d) (Tet = 2,2,5,5-tetramethyl-tetrahydrobenzofluorene), were synthesized via an acid-catalyzed cyclotrimerization of the corresponding substituted 2-acetylfluorenes. Subsequent nucleophilic addition of the [Ph{2-Flu^R}₃]^3? trianions onto 6,6,-dimethylfulvene afforded the corresponding isopropylidene-bridged pro-ligands Ph{Me₂C(2-Flu^RH)(C₅H₅)}₃ (3a-d). Discrete trinuclear tris(dichloro-ansa-zirconocene and hafnocene), Ph[{Me₂C(2-Flu^R)(C₅H₄)}MX₂]₃ (X = Cl: 4b-d-Zr, 4c,d-Hf) were prepared by salt metathesis reactions. Some zirconium complexes were further alkylated towards the corresponding tris(dialkyls) (X = Me: 5c,d-Zr; X = CH₂SiMe₃: 6c-Zr). The structures of these metal complexes were determined by elemental analyses, and by 1D, inverse 2D heteronuclear correlation, and DOSY NMR spectroscopy, as well as by theoretical computations. Those studies revealed the existence of two isomers, of C₃ and C₁ symmetry respectively, originating from the mutual orientation of the three ansa-metallocene fragments. Preliminary studies on the catalytic performances of the dichloro complexes, upon activation with MAO, in ethylene and propylene homopolymerization and ethylene/1-hexene copolymerization were carried out and compared to those of the monometallic analogues under identical conditions.

A new technique to prepare 9-oxofluorene-2-carboxylic acid

Salmeron-Valverde Robles-Martinez Campos-Medina Zehe

9-Oxofluorene-2-carboxylic acid has been obtained with a yield as high as 98.5%, following a new procedure with easy product extraction, based on the reaction of 2-acetylfluorene with sodium dichromate in acetic acid.

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