Methane, bond angles reaction with

FIGURE 54. Transition structures and reaction profiles for hydrogen abstraction from methane and silane by triplet silylene and methylene. Bond lengths are in A, bond angles in deg, energy in kcal mol"1. Reprinted with permission from J. Am. Chem. Soc., 106, 4054 (1984). Copyright (1984) American Chemical Society297. 

H — C — H bond angles of methane. Thus, for all practical purposes, the nitrogen atom of an amine can be considered to be sp hybridized with the unshared electron pair occupying one orbital (see below). This means that the unshared pair is relatively exposed, and as we shall see this is important because it is involved in almost all of the reactions of amines. 

The short-lived compoimd CH3-N=CH2 (19(2) mol%) and CH4 (18(4) mol%) were produced as pyrolysis products of trimethylamine (63(3) mol%). The stractural parameters of methane and trimethylamine were fixed at values obtained from other experiments. For A -methylenemethanamine the bond lengths and angles related with H atoms were fixed at ab initio values. The reaction... 

Figure VILl. The reaction ofCHi with tniMj-FtCljfHiO) . The changes are shown (a) in the energies of the Ptfll) complex orbitals on deformation of the angle Cl-Pt-Cl. (A) in the orbitals of the methane molecule on deformation of the angles and following an increase in the C-H bond length, (c) in the charges q on the Pt and H atoms along the reaction coordinate (the transition slate is denoted by an asterisk).

Fig. 1.15. Potential energy surface for the enantiotopomerization reaction (degenerate enantiomerization) of methane as a function of the angles a and (tetrahedral compression mode). The calculations have been performed by the EHMO method [20,82] with the imposed condition of equality of all C—H bond lengths...

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