Tables organometallic compounds

Table 6.8 Characteristics of some organometallic compounds in common use...

Table 29.4 Comparison of some typical organometallic compounds MR2...

The activities of some supported catalysts formed by using different organometallic compounds are given in Table I. In all the cases the activity referred to one millimole of the transition metal increased sharply... 

As an extension of the reaction of sulphinates with organometallic compounds, the Claisen-type condensation between ketone enolate anions 101 and arenesulphinates may be considered. It was found161,162 that this reaction provides an interesting synthetic approach to a-ketosulphoxides 102 (equation 54 Table 9). 

Furthermore, it is now clear that organometallic compounds may be unstable intermediates in other electrode processes. Thus, the reduction of acetone at a series different metals in aqueous sulphuric acid has been studied (Sekine etal., 1965), and the products of controlled-potential electrolyses are shown in Table 3. The reduction of isopropanol or pinacol... 

Common metallo-organic alkyls, alicyclic, and aryl compounds and their relevant properties are listed in Table 4.1 l l Many additional organometallic compounds are available commercially as listed in Ref 7. 

Table 2. Synthesis by recoil methods a partial list of radioactive organometallic compounds, other than the starting material, synthesized by recoil methods...

The only respect in which the hot atom chemistry of organometallic compounds has so far been applied to other fields of study is in the area of isotope enrichment. Much of this has been done for isolation of radioactive nuclides from other radioactive species for the purpose of nuclear chemical study, or for the preparation of high specific activity radioactive tracers. Some examples of these applications have been given in Table II. The most serious difficulty with preparation of carrier-free tracers by this method is that of radiolysis of the target compound, which can be severe under conditions suited to commercial isotope production, so that the radiolysis products dilute the enriched isotopes. A balance can be struck in some cases, however, between high yield and high specific activity (19, 7J),... 

Experimental and estimated thermodynamic data of homoleptic dialkylzinc compounds are listed in Table 3. Like many organometallic compounds, the lower dialkylzincs have a positive enthalpy of formation, and only the incorporation of silicon atoms in the /3-position imparts significant thermodynamic stability. The mean Zn-C bond rupture enthalpies, all of which are quite low, follow a similar trend as the bond lengths in these compounds. Thus, the presence of methyl substituents in the a-position weakens the zinc-carbon bonds, while silyl substituents strengthen them. 

Unlike the carbon acids of simpler structure, the triarylmethanes form colored salts. No quantitative results are available, but the appearance of the color has been used qualitatively as an indication of the formation of the ions and ion pairs. Table VIII gives the colors of some organometallic compounds. 

In some reactions of carbanions or organometallic compounds with very weak acids the base has a choice of protons and can give more than one salt. An example is the nuclear metallation of a substituted benzene in which the product may be oriented ortho, meta, or para. The actual results of a few such reactions are shown in Table XII. 

TABLE 4. Structural determination of organometallic compounds containing tin atoms attached to aromatic rings by NMR and Mossbauer spectroscopic methods... 

Only a few stable organometallic compounds containing double-bonded tin are known. Stannaimines are very reactive and can be scavenged in various ways. The sterically crowded groups of compound 82 confer to it some stability. Compound 82 decomposes slowly in solution below 0 °C, according to reaction 37. See also Table 8 and reaction 44241. 

The catalyst component consists of halides of IV-VIII group elements having transition valence and the cocatalysts are organometallic compounds like alkyls, aryls and hydrides of group I-IV metals. Although there are hundreds of such catalyst cocatalyst systems listed in table below. Systems based on the organoaluminium compounds such as triethyl aluminium (AlEt3) or diethyl aluminium chloride... 

The use of ion cyclotron resonance spectroscopy to measure the proton affinity of a molecule in the gas phase is now well established (for example, Ref.91 ). The application of the technique to transition metal organometallic compounds is a more recent development and some results are shown in Table 22. In all molecules studied so far it is generally observed that the dissociation energy of a cationic... 

Table 26. Selected bond enthalpy contributions, D (M-L) and (M-L) kJ mol-1, in organometallic compounds of chromium, manganese, iron cobalt and nickel and related compounds (An asterisk ( ) denotes the average value in a series)...

Tables 1.11 (a) to (c) review methods used for the determination of various types of organic compounds (1.11(a)), elements (1.11(b)) and organometallic compounds (1.11(c)) in soils.

Table 1.11(c) Methods used in the determination of organometallic compounds in soils... 

The situation regarding elements and organometallic compounds in sludges is reviewed respectively in Tables 1.13(b) and 1.13(c). 

In Tables 1.11 - 1.13 analytical techniques are cross-referenced with organic compound element or organometallic compound determined in soil, sediment or sludge and the section number in the book. If the reader finds that a method is not listed for determining a particular compound in the particular type of sample, then by examination of the table he may find a... 

Table 13.13 Selection of methods of analysis for organometallic compounds... 

The analytical method to be used will depend on the type or organometallic compound, its concentration range in the sample, the detection limit required and the type of sample. This information is summarised in Table 13.13. 

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