- Palladium-catalyzed cross-coupling reactions of organocopper derivatives of methylphosphonic esters and amides with aryl and hetaryl iodides
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Copper derivatives of methylphosphonic amides are sufficiently stable thermally and can be used in palladium-catalyzed arylation reactions resulting in synthesis of previously unknown aryl- and hetaryl-methylphosphonic tetramethyldiamides in high yields.
- Lukashev,Tarasenko,Beletskaya
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p. 172 - 178
(2007/10/03)
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- Dihydrothiophenes.10. The preparation and Diels-Alder reactions of some sulfur and phosphorus-substituted dienophiles and 2-aza-substituted 1,3-dienes
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The use of 3-carboxylated 2,5-dihydrothiophenes as dienophilic component of the Diels-Alder reaction has been investigated.The yields are generally quite low.The formation of conjugated dienes that are aminated at an interior position of the conjugated chain by formation and thermal decomposition of 3-acetamido-2,5-dihydrothiophenes appears to be a viable route to these useful compounds.One example of the Diels-Alder reaction of 2-carboxylated diethyl vinylphophonates is reported.
- McIntosh, John M.,Pillon, Lilianna, Z.
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p. 2089 - 2093
(2007/10/02)
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- Basicite et structuer de phosphoramides aliphatiques: dosage protometrique en solvants non-aqueux
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Broensted basicities (as half-neutralization potentials) have been determined at 25 deg C by potentiometric titrations in nitromethane or in the mixture sulfonale/benzene 98:2p/p for 19 aliphatic phosphoramides OPXYZ, with X, Y, or z=Me; OEt; NMe2; NEt2; NHEt; N(CH2)n (n=3 or 4); or X + Y = -NMe-(CH2)2-NMe-.Almost all of these weak bases give an homohydrogen bonding.Those with an Me or N(CH2)3 substituent are not stable in acidic medium, which is confirmed by back-titration and measure of E vs. time at the equivalent point.After comparing the results obtained in the two solvents, the effect of the nature of the substituents X, Y, Z on half-neutralization potentials and instability in acidic medium is analyzed.
- Bollinger, Jean-Claude,Faure, Rene,Yvernault, Theophile
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p. 328 - 333
(2007/10/02)
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