Ab initio molecular orbital theory has been used to study in detail the C2H20 potential energy surface. Equilibrium structures and transition structures have been explicitly identified by using gradient techniques and the split-valence 4-31G basis set. Improved relative energies have been obtained by using the split-valence

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In einer ausführlichen experimentellen Untersuchung werden Verfahren zur Herstellung von Pentenomycinen (X), ihren Epimeren (XI) sowie der Dehydroverbindung (XII) beschrieben.

Column 2, Scheme II. The line formulas in the lower right-hand corner of the scheme should read: NuCH2CH2C02R + 'OH, not NuCH2CHC02R + "OH.