CH3 species

Figure Bl.19.36. Image of the frictional force distribution of a pattern consisting of areas of CH -tenuinated and areas of COOH-tenninated molecules attached to gold-coated silicon. The tip was also fiinctionalized in (a) with CH3 species and in (b) with COOH species. The bright regions correspond to the higher friction force, which in (a) is observed on the CH areas and in (b) on the COOH areas. (Taken from [187], figure 3.)...

Isothermal a—time curves for the decomposition of U02(CH3C02)2 in air (513—573 K) [1018] showed two approximately linear regions, 0.0 < a < 0.2 and 0.2 < a < 0.9, for which the values of E were 107 and 165 kJ mole-1, respectively. In nitrogen, the earlier portion of the curve was not linear and E = 151 kJ mole-1 for the later interval. The zero-order kinetic behaviour was explained by growth of nuclei in thin, plate-like crystals, which were shown by microscopic and surface area measurements to fragment when a > 0.85. The proposed initial step in the decomposition was fission of bonds between the U02+ and the (OCO CH3) species [1018]. 

The kinetic scheme in Figure 9.23 pictures the alternative reaction possibilities of the alkyl species (here the CH3 species) on a growth site to react either with CO for hydroformylation or with CH2 for FT synthesis. 

The data in Table 3 also show that the N-H BDE of aniline (9b) and the C-H BDE of P-picoline (9c) are quite similar and are calculated to differ by only 0.1 kcal/mol at the BVWN5/AUG-cc-pVTZ level of theory. This is also true for cases other than 9b versus 9c as shown by the calculated enthalpies in Table 4.77 The isodesmic reaction in Table 4 gives the difference between the N-H BDEs of RNH2 and the C-H BDEs of comparable R CH3 species. For R=R =Ph, the calculated difference in BDEs between aniline (9b) and toluene is only 0.3 kcal/mol and for R=R =H, the N-H BDE in NH3 is computed to be only 1.4 kcal/mol larger than the C-H BDE in CH4. The latter energy difference is close to the experimental value of 3.7 kcal/mol.76 Thus, the results in Table 4 show that the N-H BDEs of primary amines are, in general, nearly... 

C3H5PdCl)2, TASF converts aryl halides, particularly the iodides, into methylar-enes in moderate to good yield. The actual reagent is believed to be an ArPd(II)-CH3 species.1... 

The activated DMSO 9 can also suffer an elimination, resulting in the highly reactive H2C=S(+)-CH3 species that can react with the alcohol, yielding a methylthiomethyl ether 13 as a side compound. Fortunately, this elimination demands a higher temperature than the normal temperature of oxidation, and a proper control of the temperature minimizes the formation of the methylthiomethyl ether side compound. 

This mechanism explains also the higher efficiency of PtSn in forming AA compared to Pt at low potentials E < 0.35 V vs. RHE), as was shown by electrolysis experiments. Indeed adsorbed OH species on Sn atoms can oxidize adsorbed CO species to CO2 or oxidize adsorbed CO-CH3 species to CH3-COOH, according to the bifunctional mechanism. ... 

A species of the form -CO-CH3 was also suggested as one of the constituents of ethanol adsorbate [107]. For an sp hybridization the C-O stretching could have a negligible component perpendicular to the electrode surface. The spectrum in Fig. 30 does not allow a -CO-CH3 species to be either confirmed or discarded. 

The CH3 species is neutral. It has seven electrons accommodated around the carbon, six of which... 

At larger exposures after the adsorbed species has been flashed to 120 °C adsorbed benzene was left on the surface. There is also evidence for CH, CH2, and CH3 species. This cyclic trimerization was confirmed on Ni/Si02 with exposed (111) faces. 

It might be predicted that cationic compounds of type IV wherein Z is an alkyl carbocation would be stable. As will be discussed later, a CH3+ species does not induce transannulation, but the more electronegative CH2Br+ cation does (9, 75). Similarly, CI2 provides a C1+ which induces transannulation in 2 to give azaphosphatrane 9(C1) (9, 75). 

All of the complexes readily polymerize ethylene in diethyl ether solution, but not at all in THF solution, indicating much stronger complexation of LuCp 2(CH2)j CH3 species by THF. 

As a first step, CH4 is absorbed through one of its hydrogen atom on 0 sites. The strong electronegative character of O ions in CaO will tend to form OH" ions by an interaction developed between hydrogen atom and O ions over CaO lattice, concomitantly favours the absorption of CH3 species at the neighbouring Ca sites due to the weakening of the Ca " —0 bond, caused by the... 

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