1,1,2,2-Tetra­kis(dimethyl­amino)­ethane-1,2-diium bis­(tetra­phenyl­borate) acetone disolvate

The title compound, C10H24N4 2+·2C24H20B−·2C3H6O, crystallizes with two acetone solvent mol­ecules per asymmetric unit. In the dication, both amidinium units are twisted about the central C—C single bond by 63.8 (3)° and the positive charges are delocalized over both N—C—N planes

1,2,4,5‐Tetrakis(dimethylamino)benzene, a New Electron Donor with Unusual Properties

A product consisting of two vinylogous amidinium ions is formed when the title compounds gives up two electrons to iodide. The resulting salt forms diamagnetic, blackish‐violet crystals. The two mesomeric π‐electron systems are almost planar; the sixmembered ring in 1 has a twist‐conformation

New proton sponges, 13. - syntheses, structures and basicities of 1,2,4,5-tetrakis(dimethylamino)benzene and 2,3,6,7-tetrakis(dimethylamino)naphthalene

1,2,4,5-Tetrakis(dimethylamino)benzene (4) and 2,3,6,7-tetrakis (dimethylamino)naphthalene (5) were prepared and structurally determined. Electron-donor functions, protonation, and the geometry of intramolecular hydrogen bonds are discussed. By oxidation of 4 to its dication the benzenoid aromaticity is cancelled in favour of two independent units as determined by X-ray structure aromaticity is cyanine-type analysi

1,2,4,5‐Tetrakis(dimethylamino)‐benzol, ein neuer Elektron‐Donor mit ungewöhnlichen Eigenschaften

In ein Gebilde aus zwei vinylogen Amidinium‐Ionen wandelt sich die Titelverbindung bei der Abgabe von zwei Elektronen an Iod um. Das dabei entstehende Salz 1 bildet diamagnetische, schwarzviolette Kristalle. Die beiden mesomeren π–Elektronensysteme sind etwa planar; der Sechsring in 1 hat Twist‐Konformation

Radical cations of 1,2,4,5-tetrakis(dimethylamino)benzene and 2,3,6,7-tetrakis(dimethylamino)naphthalene: an ESR and ENDOR study

The title radical cations, 2.+ and 3.+, were generated by oxidation of the parent compounds with tris(4-bromophenyl)aminium hexachloroantimonate, iodine or lead tetraacetate, and were characterized by ESR and ENDOR. For 2.+ a restricted rotation about the C(aryl)N bond is found at low temperature (≤ 230 K). The remarkably low a(HCH3)/a(N) ratios of 2.+ and 3.+ point to an increase in the average degree of bending at nitrogen

Protonation of 1,2,4,5-tetrakis(dimethylamino)benzene

1,2,4,5-Tetrakis(dimethylamino)benzene () forms diprotonated salts like the bis(tetrafluoroborate) and the dibromide . For -dihydrate an -X-ray structure revealed the presence of ‘bifurcated hydrogen bonds’. and the protonated species derived therefrom are discussed with regard to the sterical requirements of ‘proton sponges’. Protonation of 1,2,4,5-tetrakis(dimethylamino)benzene yields only the diprotonated dication the molecular structure of which is discussed on the basis of X-ray structure analysis