The density functional theory B3LYP/6-311g* method is used in the geometry optimization and frequency calculation on Si4X (X = Li, Be, B, C, N, O, F) clusters.
The title compound 4 was synthesized in good yield via the Michael addition of 5-methoxy-2-(5H)furanone 1 with cyclo-haxoamine 2 and subsequent oxidation of the