By Armin de Meijere
The definition of Carbon wealthy Compounds utilized during this as within the prior quantity (TCC quantity 196) of this sequence at the related normal subject contains carbon skeletons with a carbon to hydrogen ratio of 1:(kleiner gleich 1), which eventually implies all-carbon compounds (i.e. carbon allotropes). the present quantity covers smooth tools for the coupling - typically steel catalyzed - of subsystems which include double bonds, cyclopropyl teams, arenes, and metal-complexed pi-systems with acetylene and diacetylene devices. The ensuing constructions variety from macrocycles, together with people with every kind of linkers among the acetylene and diacetylene devices, to engaging in polymers and light-emitting fabrics. at any place acceptable, chemical variations of those exciting compounds and fabrics are mentioned as well.
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Extra resources for Carbon Rich Compounds II, Macrocyclic Oligoacetylenes and Other Linearly Conjugated Systems
Unfortunately, all attempts to generate the free cyclocarbons by decomplexation of 4 and 5 failed. The dppm ligands generate particularly stable complexes, and the bulky phosphine residues hinder the attack of a reagent at the metal center. Alternatively, it cannot be excluded that cyclo-C18 or its partially deprotected precursors decompose under the conditions of the various deprotection methods [47–49] that have been applied. 3 The Carbon Oxide Route to Cyclocarbons An attractive approach to cyclocarbon molecules required the preparation of the higher carbon oxides 6–8 followed by either thermal or photochemical CO-elimination (Scheme 2) [41, 52].
73 5 References . . . . . . . . . . . . . . . . 74 1 Introduction Acetylenic molecular scaffolding has turned into a major area of research over the past decade, fueled by several different yet simultaneous developments. The mass-spectrometric observation of buckminsterfullerene (C60) and the proposal that it has a stable soccer-ball-type structure in 1985 , followed in 1990 by the isolation of this first molecular allotrope of carbon in bulk quantities , led chemists to search for other stable molecular and polymeric – non-fullerenic – forms of carbon, which it might be possible to synthesize and isolate.
45 47 48 52 52 53 . . . . . . . 60 . . . . . . . 60 . . . . . . . 62 . . . . . . . 64 Topics in Current Chemistry, Vol. 201 © Springer-Verlag Berlin Heidelberg 1999 44 F. Diederich · L. 3 Donor-Acceptor Substituted Tetraethynylethenes . . . . . 1 Preparation, Physical Properties, and Photochemical transÆcis Isomerization . . . . . . . . . . . . 2 Structure-Property Relationships in Nonlinear Optical Tetraethynylethenes .