Metal organyls

II. Alkali Metal Organyl-, Alkali Metal Hydrido-, and Alkali... 

ALKALI METAL ORGANYL-, ALKALI METAL HYDRIDO-, AND ALKALI METAL DIORGANYLPHOSPHIDONICKELfO) tt-LIGAND COMPLEXES... 

To prove or disprove route (b) we carried out many chemical studies [13] but I will not enter into details and only give an accoimt of the results. Obviously, the dimer of the standard silaethene is formed neither by condensation route (a) alone nor by silaethene dimerization route (b) alone, but half by elimination way (b) than by insertion way (c) and finally half by condensation way (a ) (Scheme 5). In other words, the product in the middle of Scheme 5 is not formed by an SN2-reaction - usual in silicon chemistry - via route (a), but by a 8, 1-reaction - uncommon in silicon chemistry - via routes (b, c). In fact, two reactants compete for the silaethene intermediates so formed the silaethene source, that is an organometal compoimd, and the silaethene itself The latter is defeated. In this connection, it should be remembered that metal organyls are used for the preparation of the sources of standard silaethene. Naturally, these compete, too, for the silaethene and may suppress reaction (c). 

In contrast, the reaction between sterically normal silyl azides and metal organyls (the same is true for germyl and stannyl azides) leads either to substitution of the silicon-bound azide group by an organyl group, or to cleavage of molecular nitrogen from the azide moiety 10) [Eq. (3)]. The preference for reaction in paths (a) or (b) of Eq. (3) depends on the kind... 

Similar to group-II metal organyls, the reaction is complete with the association of the organometallics. In donor solvents [ether, dimethoxyethane (glyme), etc.] the associates break down to form more definite ionic species, and there is a rapid equilibrium between intimate and solvent-separated ion pairs. 

Messenger-RNA mRNA) for gene cloning, 242 Mesylates. See Methanesulfonic acid, esters Metal organyls. See Organometallic compounds MethanaL See Formaldehyde Methanamine, 1,1-dimethoxy-jV.Mdiinethyi- formylation with, 82... 

Palladium appears to be the most versatile metal for catalytic reactions in organic synthesis. Most prominent are cross-coupling reactions between compounds with sp or sp C-X bonds and metal organyls. Moreover, a large number of palladium-mediated reactions for C-H bond activation has been described. In most cases, palladium(O) displays the catalytically active species. However,... 

Suspension and emulsion polymerization are the main commercial processes for the manufacture of FIFE. For industrial appHcations, these processes are described in several patents [652 676]. Suitable initiators for polymerization are peroxy compounds. The polymerization with coordination catalysts of the Ziegler-Natta type, the photoinitiation by metal carbonyls, combination of metal organyls with hydrogen peroxide, or the radiation-induced polymerization in solution or emulsion has been used extensively on a laboratory scale [677-685]. The polymerization of TFE is very exothermic (172kJ/mol) [653]. 

This collection contains one platinum and four palladium organyls (7a and 7b-7e, respectively) as well as an azacyclic cobalt(II) complex (8). Whereas the five pure metal organyls 7a-7e meh between 73 and 96°C and show only a monotropic No phase, the cobah(II) compound 8 does exhibit the Ncoi phase enantiotropically at lower temperatures, between 30 and 60°C. The metal-free precursor ligand of 8 is not mesomorphic [63] ... 

Scheme 4-251. Coupling of a-carbon atoms at aliphatic amines with metal organyls catalyzed by tris(acetylacetonato)iron.

Cross-Coupling Reactions with other Metal Organyls... 

Since the lUPAC nomenclature system relies totally on the pivotal concept of the parent structure to which, in a second sphere, substituents are assigned, it appeared advisable to maintain this division also for the chapters of this book. Thus, we begin with the exposition of the nomenclature rules for parent structures and, in the second chapter, proceed with the discussion of the different types of nomenclature for substituted systems, radicals, and ions in the third chapter specific classes of functional compounds are addressed, followed, in the forth chapter, by the treatment of metal organyls and, in the fifth, of carbohydrates. The concluding sixth chapter takes up once again the construction of the final names of complex compounds including isotopic modifiers and stereochemical descriptors. 

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