Naomichi Furukawa

Peri interaction between selenium atoms in dinaphtho[1,8-b,c]-1,5-diselenocin and 1,8-bis(methylseleno)naphthalene

Abstract A new symmetrical diseleno peri -bridged naphthalene, dinaphtho[1,8- b,c ]-1,5-diselenocin ( 1 ), and 1,8-bis(methylseleno)naphthalene ( 2 ) have been synthesized. The cyclic voltammogram of 1 and 2 showed one reversible oxidation peak with remarkably low oxidation potential. Selenide 1 in CHCl 3 under air and scattered light undergoes oxidation to give the corresponding Se -oxide 11 . The peri selenium-selenium interaction of 1 and 2 was found in electrochemical oxidation, in concentrated sulfuric acid, and in EI mass spectrum.

First example of tetraalkyl substituted ditelluride dication salt from 1,5-ditelluracyclooctane

A new cyclic bis-telluride, 1,5-ditelluracyclooctane (1), has been synthesized. Two-electron oxidation of 1 with two equivalents of NOBF4 or NOPF6 afforded a novel ditelluride dication BF4- or PF6- salt 2 which was characterized by 125Te NMR spectroscopy, and the dication 2 behaves as an oxidizing agent.

Preparation and reactivity of dichalcogenide (S, Se) dication salts from medium-sized cyclic bis-sulfide and bis-selenides

Abstract The disulfide dication salt, 1,5-dithioniabicyclo[3.3.0]octane bis(trifluoromethanesulfonate) ( 3 ), was isolated from the reaction of 1,5-dithiacyclooctane 1-oxide with trifluoromethanesulfonic anhydride. Two-electron oxidation of 1,5-diselenacyclooctane with two equivalents of NOPF 6 or NOBF 4 gave the first diselenide dication salt, 1,5-diselenoniabicyclo-[3.3.0]octane bis(hexafluorophosphate) or bis(tetrafluoroborate ( 5 ). The disulfide and diselenide dication salts ( 3 and 5 ) act as an oxidant or as an electrophile depending on the added reagents.

Preparation and characterization of a four-coordinated ditellurane stabilized by a transannular tellurium–tellurium bond from 1,5-ditelluracyclooctane: a new multicentre hypervalent species

1,5-Ditelluracyclooctane 1 reacted with halogens (I2 and Cl2) to give new dihalogenoditelluranes with a TeIV–TeIV. Reduction of the latter with aqueous NaOH, PhSH, Na2S and SmI2 gave the neutral bis-teliuride 1.

Formation of new hydroxyselenonio and hydroxyammonio-selenuranes from reaction of Se-oxides of 5H,7H-dibenzo[b,g][1,5]diselenocine and N-methyl-5H,7H-dibenzo[b,g][1,5]selenazocine with silyl triflates

The transannular reaction of 5H,7H-dibenzo [b,g][1,5] diselenocine Se-oxide 1 or N-methyl-5H,7H-dibenzo[b,g][1,5]selenazocine Se-oxide 2 with 1 equiv. of silyl triflates, CF3SO3SiMe3 and CF3SO3SiMe2But, produced a new hypervalent selenurane which consists of two Unsymmetrical apical ligands such as the hydroxy group and the selenonio or ammonio group.

A new preparative method and reactivity of diselenide dication salt from 5H,7H-dibenzo[b,g][1,5]diselenocine

A new medium-sized heterocycle, 5H,7H-dibenzo[b,g][1,5]diselenocine 1, has been synthesized; the reaction of the selenoxide of 1 with two equivalents of CF3SO3SiMe3 gave the stable diselenide dication salt, this is a new method for the preparation of the diselenide dication.