Toyozo Takada

Organogermanium compounds: First synthesis of bioactive trithiagermatranes substituted with novel functional groups

Abstract The synthesis and properties of trithiagermatranes ( 3 ) via reaction of tris(2-mercaptoethyl)amine with trimethoxygermyl adducts ( 5 ) and germanium sesquioxides ( 6 ) are described.

Organogermanium compounds; spectroscopic study on the influence of aryl groups in the organogermanium aryl compounds on the (P-d)π interaction

The synthesis and properties of arylgermanium compounds through the reactions of aryllithium with germanium halides were investigated. 1 H-Nmr spectroscopic analysis showed the (p-d) π interaction between the germanium atom and the double bond of the aryl group to diminish in the following group order: 2-benzofuranyl>2-furanyl>2-benzothiophenyl>2-thiophenyl>phenyl group

Reaction of Benzoquinones with Cyclic Amines; 1H- and 13C-Nmr Spectra of Amine-adducts

Reaction of unsymmetrical 1,4-benzoquinone with cyclic amines afforded a mixture of amine-adducts. Using dibromoquinone as the substrate, monoamine adduct was obtained regioselectively. Regiochemistry was determined by 1 H- and 13 C-nmr spectroscopic analyses

A convenient synthesis of 7-methoxymitosene by the photolysis of aminobenzoquinones

A simple method for the preparation of pyrrolo[1,2-a]indoloquinone derivatives using the photolysis of amino-quinones has led to a formal synthesis of 7-methoxymitosene.