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- Glover, T.E., Ackerman, G.D., Belkacem, A., Heimann, P.A., Hussain, Z., Padmore, H.A., Ray, C., Schoenlein, R.W., Steele, W.F., Young, D.A., Lee, R.W.
(författare)
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Metal-insulator transitions in an expanding metallic fluid: particle formation kinetics.
- 2003
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Ingår i: Physical Review Letters. ; 90, s. 36102/1-4
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Tidskriftsartikel (refereegranskat)
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- Ray, C. A., et al.
(författare)
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Diastereoselective Lewis acid-catalysed 4+2 cycloadditions of 3-alkyl-, 3-aryl- and 3-carboxyl-2H-azirines : a route to aziridine containing azabicyclo 4.1.0 heptanes and azatricyclo 2.2.1.0 nonanes
- 2002
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Ingår i: Tetrahedron. - 0040-4020 .- 1464-5416. ; 58:30, s. 5983-5987
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Tidskriftsartikel (refereegranskat)abstract
- 3-Substituted-2H-azirines have been employed as 2pi components in Lewis acid-catalysed hetero Diels-Alder reactions with a variety of diene systems. A series of Lewis acids were screened for catalytic behaviour in the reaction between Danishefsky's diene and 3-phenyl-2H-azirine to give the cycloaddition adduct, and in most cases elevated temperature were required to effect cycloaddition. A noteworthy exception was a BF3.Et2O-catalysed cycloaddition which proceeded in less than I h between -70degreesC and -60degreesC. The cycloadditions were found to proceed with endo selectivity providing a single diastereoisomeric product. Benzyl 2H-azirine-3-carboxylates were found to be activated by Lewis acids and participate in endo selective cycloadditions at -20degreesC.
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