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Displaying article 1-7
p. 412-419
Received: 6 March 2002; in revised form: 30 April 2002 / Accepted: 30 April 2002 / Published: 31 May 2002
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| Download PDF Full-text (161 KB) Abstract: A facile regio- and chemoselective bromomethoxylation of alkenes under microwave irradiation conditions employing a new polymer supported brominechloride resin is reported. The resin is prepared from the commercially available chloride resin by a simple one step procedure.
p. 420-432
Received: 10 July 2001; in revised form: 10 April 2002 / Accepted: 12 April 2002 / Published: 31 May 2002
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| Download PDF Full-text (197 KB) Abstract: Diethyl 1,2-benzoxaphosphorine-3-carboxylates 5 undergo a regio- and stereoselective [2+2] photodimerization reaction in methanol solution under the action of sunlight, giving in all cases the corresponding anti head-to-tail dimers 6 and 7. Concerning the stereogenic P atom, the photodimerization is also stereoselective, and the centrosymmetric stereoisomer 6 predominates over the non symmetric P-epimer 7.
p. 433-436
Received: 27 March 2002; in revised form: 9 May 2002 / Accepted: 10 May 2002 / Published: 31 May 2002
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| Download PDF Full-text (27 KB) Abstract: A new method of palladium-catalyzed phenyl-alkene bond formation is reported. This reaction involves transfer of all three phenyl groups from triphenylantimony onto alkenes containing allylic protons.
p. 437-446
Received: 14 November 2001; in revised form: 13 May 2002 / Accepted: 13 May 2002 / Published: 31 May 2002
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| Download PDF Full-text (345 KB) Abstract: Methyl 5-O-acetyl-5-cyano-6-deoxy-2,3-O-isopropylidene-β-L-gulofuranoside was prepared in high yield from methyl 6-deoxy-2,3-O-isopropylidene-α-D-lyxopentodialdo-1,4-furanoside. The configuration at the C5 atom was unambiguosly established by single crystal X-ray analysis of the corresponding 5-O-acetyl derivative. The conformation of the furanose and 1,3-dioxolane rings is also discussed.
p. 447-455
Received: 16 January 2002; in revised form: 14 May 2002 / Accepted: 15 May 2002 / Published: 31 May 2002
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| Download PDF Full-text (77 KB) Abstract: Synthetic routes to four new tridentate ligands with large cavities have been developed. Each ligand features two halides at the termini of the molecules that could be used for further elaboration of the system. Such compounds are ideal for encapsulating organoiodide guests using charge-transfer interactions.
p. 456-464
Received: 19 March 2002; in revised form: 15 May 2002 / Accepted: 17 May 2002 / Published: 31 May 2002
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| Download PDF Full-text (45 KB) Abstract: Niobium pentachloride has proven to be a powerful activating agent for Diels-Alder or conjugate addition reactions of cycloenones. The Diels-Alder product was obtained only with an unsubstituted enone (cyclohexenone) and the highly reactive diene cyclopentadiene; substituents in the b-position of enones seem to prevent Diels-Alder reaction: oxygenated substituents favor the formation of vinyl chlorides (ethyl ether or dichloromethane as solvents) or enol ethers (ethyl acetate as solvent), while a methyl substituent prevents any kind of transformation with NbCl5 . Less reactive dienes, furan and 2-methylfuran gave the conjugate addition products of the furan ring to the enone system.
p. 465-468
Received: 14 October 2001 / Accepted: 25 May 2002 / Published: 31 May 2002
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| Download PDF Full-text (66 KB) Abstract: Deprotections of 2,4-dinitrophenylhydrazones to their corresponding carbonyl compounds have been carried out in good yields by using N ,N ′-dibromo-N ,N ′-1,2-ethanediylbis(p -toluenesulphonamide) (BNBTS, 2) under microwave irradiation.
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