- Steric effects of nucleophile-radical coupling reaction. Determination of rate constants for the reaction of aryl radicals with 2-naphthoxide anion
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The absolute rate constants for the reaction of different aryl radicals with 2-naphthoxide anion were determined using an indirect method, a competition of the coupling reaction with the H-atom abstraction. We here show that the radical-ambident nucleophi
- Tempesti, Tomas C.,Pierini, Adriana B.,Baumgartner, Maria T.
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experimental part
p. 1523 - 1528
(2009/10/30)
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- Facile and regioselective dealkylation of alkyl aryl ethers using niobium(V) pentachloride
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A simple and facile method for the cleavage of carbon-oxygen bonds promoted by niobium pentachloride(V) is described. Excellent yields and regioselectivities were observed with various alkyl aryl ethers to give the phenols. NMR studies revealed the formation of monoaryloxy niobium salt(V), and a neighboring-group effect may play a significant role in the regioselectivity. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
- Sudo, Yukinori,Arai, Shigeru,Nishida, Atsushi
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p. 752 - 758
(2007/10/03)
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- SYNTHESES ASYMETRIQUES ET SYNTHESES ASYMETRIQUES POTENTIELLES D' α-AMINO ALCOOLS: HYDROXYAMINATION D' OLEFINES PAR LA METHODE DE SHARPLESS.
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Optically active α-amino alcohols have been synthesized by Sharpless' method with (-)-10,11-dihydroquinine 2 and (R)-(-)-pantolactone 8 as chiral inducers.Five secondary (dl) alcohols : 3,4,5,6,7 and (dl) 2-hydroxyheptahelicene 1 have also been used to prepare the intermediate diastereomeric (dl) α-hydroxy carbamates 9.The highest inductions were obtained with (-)-10,11-dihydroquinine and (E)-stilbene (e.e. >/=98percent and with (dl) 2-hydroxyheptahelicene and (E)-stilbene (d.e. >/=98percent).
- Hassine, B. Ben,Gorsane, M.,Pecher, J.,Martin, R. H.
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p. 759 - 770
(2007/10/02)
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