Eliminations, a, 3, % and

Besides dissociation of ligands, photoexcitation of transition metal complexes can facilitate (1) - oxidative addition to metal atoms of C-C, C-H, H-H, C-Hal, H-Si, C-0 and C-P moieties (2) - reductive elimination reactions, forming C-C, C-H, H-H, C-Hal, Hal-Hal and H-Hal moieties (3) - various rearrangements of atoms and chemical bonds in the coordination sphere of metal atoms, such as migratory insertion to C=C bonds, carbonyl and carbenes, ot- and P-elimination, a- and P-cleavage of C-C bonds, coupling of various moieties and bonds, isomerizations, etc. (see [11, 12] and refs, therein). 

In principle, one could solve equations (la), (2a) and (3a) for K, a and. Unfortunately, and [n] are often highly correlated and it is recommended that only one of these data be used per standard. A practical procedure is to estimate using narrow MWD polystyrene standards leaving two unknowns, K and a. To illustrate the method, suppose Mjj and M data are available for the single broad MWD standard. Dividing equation (2a) by (la) eliminates a and one is left with a single-variable search for 3. 

D The pH is above 7 initially and decreases, so an acid titrant is neutralizing a base. This eliminates A and C. The maximum slope (equivalence point) at the neutral pH of 7 indicates a strong base titrated with a strong acid, D. 

One can eliminate a and 03 from Eqns. (2.4.14) using Eqns. (2.4.10) in many ways. This leads us to the following differential equations for... 

Using the boundary conditions to eliminate A", and K, the concentratio profile is given by... 

Figure 5.3. Competitive reductive elimination (a) and ligand substitution (b) in the reaction of/ra/i5-[AuCl(SCN)(NH3)2] with thiocyanate (Ref. 58). Reprinted with permission from Inorganic Chemistry. Copyright 1989 American Chemical Society.

Equations (5.2.30) and (5.2.31) are a pair of differential equations that may be solved by differentiating the first with respect to time and eliminating A and d A p/dt between the new second-order differential equation and the two original equations in order to arrive at a second-order differential equation with constant coefficients ... 

FIGURE 29.5 Local transformation of polygonal structures by edge elimination (a and b) or edge rotation (c). 

The positive rather than the negative sign before the radical is seen to be correct by the consideration of limiting cases.) From equation 7 we find on eliminating a and b the expression... 

Equation (11.35) may be used in this expression to eliminate a and SJTl. The resulting expression is the criticality condition, which we write in the form... 

The tpy ligand provides some stereochemical control in supramolecular complexes by eliminating A and A isomeric mixtures associated with the trisfbidentate) metal centers. Substitution of the TL, bpy in [ (bpy)2Ru(BL) 2RhCl2] (BL = dpp or bpm), with tpy and Cl affords [ (tpy)RuCl(BL) 2RhCl2] " (BL = dpp or bpm)." The Ru / oxidation of [ (tpy)RuCl(BL) 2RhCl2] (BL = dpp or bpm) occurs as a reversible couple at a less positive potential than the bpy-based system at 1.08 V. This is consistent... 

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