No abstract

The structures of the adducts derived from the reactions of substituted ketenes with dihydropyridine derivatives have been clarified by single crystal X-ray analyses and the formation mechanism is discussed on the basis of the reaction-path calculations by semiempirical and density functional theory (DFT) molecular orbital methods.

The structure of the product derived from the reaction of a dihydropyridine derivative with phenylsulfinylallene has been clarified by a single crystal X-ray analysis and the formation mechanism is discussed on the basis of the reaction-path calculations by semiempirical and ab initio molecular orbital methods.

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Mechanism. -The structures of the adducts from the reaction of dihydropyridine derivatives (I) with ketenes (II) is determined by single crystal X-ray analysis. The formation mechanism is discussed on the basis of reaction-path calculations by semiempirical and density functional theory (DFT) MO methods. Ketenes (II) are prepared in situ from the corresponding substituted acetyl chlorides. -(OISO, S.; ETO, M.; YOSHITAKE, Y.; HARANO*, K.; Chem. Pharm. Bull. 51 (2003) 9, 1068-1074; Fac. Pharm. Sci., Kumamoto Univ., Oehon, Kumamoto 862, Japan; Eng.) -M. Bohle 05-118