- The acylphosphonate function as an activating and masking moiety for the α-chlorination of fatty acids
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α-Chloroacylphosphonates were prepared in situ by chlorination of acylphosphonates using sulfuryl chloride and were subsequently cleaved to the corresponding α-chlorinated fatty acids with hydrogen peroxide - sodium bicarbonate.
- Stevens, Christian,De Buyck, Laurent,De Kimpe, Norbert
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- Oxidation of aliphatic 2,2-dichloroalkanals by HNO3 in CH 2Cl2: An easy and eco-friendly route to the corresponding 2,2-dichloroalkanoic acids
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A simple, economically convenient, and eco-compatible procedure for the oxidation of 2,2-dichloroalkanals to the corresponding alkanoic acids has been set up, employing HNO3 in CH2O2, in the presence of NaNO2 as catalyst.
- Bellesia, Franco,De Buyck, Laurent,Ghelfi, Franco,Pagnoni, Ugo M.,Strazzolini, Paolo
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p. 1473 - 1481
(2007/10/03)
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- Kinetic evidence for hydrophobically stabilized encounter complexes formed by hydrophobic esters in aqueous solutions containing monohydric alcohols
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The pH-independent hydrolysis of four esters, p-methoxyphenyl 2,2-dichloroethanoate (1a), p-methoxyphenyl 2,2-dichloropropanoate (1b), p-methoxyphenyl 2,2-dichlorobutanoate (1c), and p-methoxyphenyl 2,2-dichloropentanoate (1d), in dilute aqueous solution
- Buurma,Pastorello,Blandamer,Engberts
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p. 11848 - 11853
(2007/10/03)
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- 2,2-dichloroaldehydes and 2,2-dichlorocarboxylic acids from 2- picoline·HCl catalyzed chlorination of aldehydes
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An efficient preparation of 2,2-dichloroaldehydes and 2,2- dichlorocarboxylic acids has been achieved by chlorination of aldehydes using 2-picoline hydrochloride as recoverable catalyst.
- Bellesia, Franco,De Buyck, Laurent,Ghelfi, Franco
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p. 146 - 148
(2007/10/03)
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- Halogen atom transfer radical cyclization of N-allyl-N-benzyl-2,2-dihaloamides to 2-pyrrolidinones, promoted by Fe0-FeCl3 or CuCl-TMEDA
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The halogen atom transfer radical cyclization of a N-allyl-N-benzyl-2,2-dihaloamides to 2-pyrrolidinones has been carried out in high yields under mild conditions, in a reaction promoted by CuCl-TMEDA or Fe0-FeCl3 in acetonitrile or N,N-dimethylformamide, respectively.
- Benedetti, Miriam,Forti, Luca,Ghelfi, Franco,Pagnoni, Ugo Maria,Ronzoni, Roberto
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p. 14031 - 14042
(2007/10/03)
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- α,α-DICHLOROALDEHYDES AND α,α-DICHLOROCARBOXYLIC ACIDS FROM LONG CHAIN 1-ALKANOLS. IMPROVED CHLORINATION IN THE SYSTEM DMF-CHCl3-MgCl2
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Production of α,α-dichloroaldehydes by direct chlorination of 1-alkanols with chlorine gas, catalyzed by DMF and DMF*HCl, was extended to long chain compounds (CnH2n+1OH; n = 5, 6, 8, 10, 12, 14, 16, 18).Two problems specific to the longer chains were solved to obtain isolated yields in the range 70-85 percent; a) parasitic radical chlorination was largely controlled by shielding from light; b) alkyl alkanoate side product (8 percent for n = 8 but 25 percent for n = 16 or 18) was decreased to 0-2 percent in the presence of MgCl2*H2O.Homogeneity of the reaction medium was improved with chloroform as a cosolvent.Oxidation of the aldehydes to dichlorocarboxylic acids proceeded smoothly with aqueous KMnO4 up to the tetradecanal.For the longer chains 30 percent hydrogen peroxide-NaHCO3 in acetone (overnight at 48-52 deg C) was the preferred oxidant.
- Buyck, L. De,Casaert, F.,Lepeleire, C. De,Schamp, N.
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p. 525 - 534
(2007/10/02)
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