- RhIII-Catalyzed Decarboxylative o-Acylation of Arenes Bearing an Oxidizing Directing Group
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Here in we report, rhodium(III)-catalyzed decarboxylative acylation of arenes using α-oxocarboxylic acids as acyl surrogate. In this strategy, O–NHAc group act as an autocleavable oxidizing directing group (ODGauto), thus giving rise to ortho-acylated phenols in moderate to good yields. Mechanistic studies provided strong support for a kinetically relevant C–H bond activation. According to the best of our knowledge, this is the first report of Rhodium catalyzed decarboxylative acylation.
- Bera, Suvankar,Chandrasekhar,Chatterjee, Satadru,Killi, Sunil Kumar,Sarkar, Debabrata,Banerji, Biswadip
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p. 3877 - 3881
(2019/06/28)
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- Direct C-H bond arylation of 2-hydroxybenzaldehydes with arylboronic acids via ligand-free palladium catalysis
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A mild and efficient ligand-free palladium-catalyzed direct C-H bond arylation reaction was developed to afford 2-hydroxybenzophenones in good to excellent yields from easily available 2-hydroxybenzaldehydes and arylboronic acids. The given reaction provided one of the easiest pathways for accessing 2-hydroxybenzophenones, and a variety of functional groups could be tolerated in this process.
- Weng, Fei,Wang, Chengming,Xu, Bin
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supporting information; experimental part
p. 2593 - 2596
(2010/07/04)
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- Synthesis of some newer analogues of substituted dibenzoyl phenol as potent anti-inflammatory agents
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The newly synthesized compounds dibenzoyl phenols 4a-f using microwave irradiation were screened for their anti-inflammatory activity and compared with standard drugs. Benzoylation of hydroxybenzophenones 1a-f affords substituted benzoyl phenyl benzoates
- Khanum, Shaukath Ara.,D, Venu T.,Shashikanth, Sheena,Firdouse, Aiysha
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p. 5351 - 5355
(2007/10/03)
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- A novel and facile synthesis of 1,2,3-triacylbenzenes
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3,4,5-Triacyltoluenes 7 were prepared in high yield by a novel oxidative cleavage reaction of 2,6-diacylcresol monohydrazone 6 with lead tetraacetate.
- Kotali,Glaveri,Pavlidou,Tsoungas
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p. 1172 - 1173
(2007/10/02)
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- Dinuclear Metal Complexes. Part 2. Synthesis, Characterisation, and Electrochemical Studies of Macrocyclic Dicopper(II) Complexes
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The synthesis, characterisation, and electrochemical studies of dicopper(II) complexes 1>2.nH2O of the macrocycle 7,11;19,23-dimetheno-9,21-dimethyl-tetra-azacycloicosa-5,7,9,12,17,19,21,24-octaene-25,26-diol (H2L1), and of some 6,12,18,24-substituted (Me4; Prn4; Ph4; Ph, Me, Ph, Me) derivatives have been carried out.These compounds undergo sequential one-electron transfers at two different potentials.For all of these compounds, except for 1>2.2H2O, two reversible or almost reversible reduction steps have been observed in acetonitrile medium using a hanging mercury drop electrode.In the case of 1>2.2H2O, the second couple became obscured due to the presence of an adsorption phenomenon or secondary electrode reaction.However, in NN-dimethylformamide (dmf) medium, satisfactory voltammograms have been obtained only with 1>2.2H2O.The mixed-valent complexes are considerably more stable in acetonitrile than is IICuIL1>+ in dmf.The potentials of the first reduction step (E1) remain practically invariant throughout the series and are independent of the extent of magnetic interactions in the dicopper(II) complexes.The potentials of the second reduction step (E2) vary with the alkyl and aryl groups present, and a linear plot has been obtained for E2 vs. the Hammett function ?m.On the basis of previously reported observations and the present study it is inferred that in acetonitrile medium the unpaired electron in the mixed-valent complexes remains localised on one of the copper atoms.
- Mandal, Sanat Kumar,Nag, Kamalaksha
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p. 2429 - 2434
(2007/10/02)
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