Zur Formulierung der Farbsalze. Heteropolare Kohlenstoffverbindungen (VII.)

Abstract

Rohrchen gegeben ist. Die Titrierflussigkeit wird in groReren Stickstoff-Rohren mit angesetzter Biirette aufbewahrt, wie sie Schlenk,) friiher beschrieben hat, und wie sie der eine von uns in kurzem in etwas abgeanderter Form an anderer Stelle beschreiben wird.

Polymorphism Versus Thermochromism: Interrelation of Color and Conformation in Overcrowded Bistricyclic Aromatic Enes

“…[36] 2) Zwitterionic forms of the molecule with ionoid carbonyl groups (3), [33,37] in accord with Diltheys theory of organic chromophores. [38] 3) Mesomeric betaine structures that make small contributions to the resonance hybrid at ambient temperatures, but make large contributions at high temperatures. [39] 4) A diradical state in which the central bond linking the planar tricyclic moieties is twisted by 908 and is "not a true double bond".…”

Carbonium ion: Waxing and waning of a name

“…He also used the terms "Triarylcarboniumsalze" and "Carboniumions". Four years later, however, Dilthey had changed his view about carbonium (10). Echoing Gomberg's point about onium salts (3), Dilthey then suggested that the trivalent species be named carbenium salt, in acknowledgment of its unsaturated state.…”

“…Few chemists were persuaded at the time. In 1938, in a short paper on the mechanism of Friedel-Crafts reactions, Dilthey used formulas for acyl and alkyl cations but did not use any name designation for them (10).…”

“…The resemblance to those rhyming species, to which attention was called early on (6), namely, having a tri valent, positively changed central atom, was to be abandoned as a basis for the class name. The tri valent carbon species was to be called a carbenium ion (Dilthey's proposal in 1929 (10)). In that article, Olah made an excellent case for use of the general term carbocation for all ions with a positive change on carbon.…”