- α-(4-Nitro Phenoxy) chalcones as synthons for cis-(±)-1,5- benzothiazepines
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α-(4-Nitro Phenoxy) chalcones, V have been utilized as intermediate for the synthesis of some new cis- (±)-2-aryl-3-(4-nitro phenoxy)-4-phenyl-1,5- benzothiazepine VI by cycloconden-sation of 2-amino thiophenol in the presence of mild base.
- Rao,Arun Kumar Gupta,Gupta
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p. 2763 - 2768
(2007/10/03)
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- The Photochemistry of α-Phenoxyacetophenones Investigated by Flash-CIDNP-spectroscopy
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The photochemistry of 14 different substituted α-phenoxyacetophenones (1) was studied by CIDNP-spectroscopy using XeCl excimer laser (308 nm) and a 250 MHz 1H-NMR spectrometer.To characterize the excited states the electronic absorption and emission spectra as well disappearance quantum yields were investigated also. - Two reaction channels were established: 1) β-cleavage from the singlet state; and 2) the formation of acetophenones via the respective enol forms where the origin of the polarization remains unclear.It is concluded that these are the main reaction channels, since all products formed show polarizations in the CIDNP-spectr a. - In contrast to the current assumptions for the typical acetophenone reaction of (1) leading to the β-cleavage, we are led to interprete the CIDNP-spectra of (1) as a result of a reaction due to the phenoxy part with all characteristics of a photo-Claisen reaction. Keywords: Luminescence / Photochemistry / Radicals / Spectroscopy, CIDNP / Spectroscopy, Nuclear Magnetic Resonance / Spectroscopy, Ultraviolet
- Palm, W.-U.,Dreeskamp, H.,Bouas-Laurent, H.,Castellan, A.
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- Polymer Supported Reagnts. Synthesis of p-Bromophenacyl Ethers
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Phenoxide supported on Ambrelite IRA-400 on reaction with p-bromophenacyl bromide gave corresponding p-bromophenacyl ether in quantitative yield and purity.
- Thorat, M. T.,Mane, R. B.,Jagdale, M. H.,Salunkhe, M. M.
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p. 106 - 107
(2007/10/02)
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