Kiyosi Kondo

Reactions of carbenes bearing sulphide linkages at the δ-position

The carbenes generated from γ-allylthiobutyrophenone tosylhydrazone and carbenoids from 4-benzyl- and 4-allyl-thio-1-diazobutan-2-one give thiolan and thiolanone derivatives, respectively, via cyclic sulphonium ylide intermediates.

Intramolecular reactions of α- and β-allylthioalkylcarbenes

The difference in products obtained from intramolecular reactions of α- and β-allylthioalkylcarbenes are attributable to formation of 3- and 4- membered cyclic ylides, respectively.

Intramolecular cycloadditions of α- and β-allylthioalkyl diazoalkanes

3-Thiabicyclo[3,1,0]hexanes and 4-thiabicyclo-[4,1,0]heptanes were obtained by the intramolecular cycloadditions of α- and β-allylthioalkyl diazoalkanes.

Photosensitized oxygenation of acyclic 1,3-dienes

3,6-Dihydro-o-dioxins were obtained as major products by the photosensitized oxygenation of simple acyclic 1,3-dienes.

Sulphonium ylides with a phosphinyl substituent

The synthesis and some novel reactions of sulphonium methylides stabilized with a diethoxy-phosphinyl group are described.