L-donor

TiN nanoparticles are produced via ammonolysis of TiCl4Ln complexes (L = donor ligand. Table 19.1) in the solid state (Eq. 1) [24]. 

In turn, each M—X bond engages in 3c/4e cu bonds with the opposite L donor of the other r 3-Cp ring. Thus, the following resonance structures summarize the primary bonding pattern, which can be compactly described as two tu bonds ... 

Perchlorate Breast milk USA 457 Median 7.3/0.01-48 pg/L Donors were Dasgupta et al. [258]... 

Abstract The theoretical and experimental research on carbodiphosphoranes C(PR3)2 and related compounds CL2, both as free molecules and as ligands in transition metal complexes, is reviewed. Carbodiphosphoranes are examples of divalent carbon(O) compounds CL2 which have peculiar donor properties that are due to the fact that the central carbon atom has two lone electron pairs. The bonding situation is best described in terms of L C L donor acceptor interactions which distinguishes CL2 compounds (carbones) from divalent carbon(ll) compounds (carbenes) through the number of lone electron pairs. The stmctures and stabilities of transition metal complexes with ligands CL2 can be understood and predictions can be made considering the double donor ability of the carbone compounds. 

Figure 12 Formation of a peroxo dicopper(H) complex 22 containing a simple imidazole ligand. The preformed Cu202 moiety can be transferred by substitution of L donors by tnipa, giving known complex 3.

The high degree of delocalization in icosahedral carboranes has led Mingos and co-workers to examine their nonlinearities. Although the observed /3 values are comparatively low, the full potential of these materials has not yet been assessed the compounds that were examined contained either a donor or an acceptor substituent, and studies of a l-donor-12-acceptor substituted carborane that may reveal the extent of their NLO merit have not yet been promulgated. 

Substitutionally labile cations, [Re(CO)s(S)]+ (S = solvent) are available by oxidation of (1), by halide abstraction from ReBr(CO)5 with Ag+ salts, or by the reaction of ReH(CO)s or ReMe(CO)5 with Ph3CBp4 or from the latter and HBF4. The resulting Re(CO)5pBF3 is a strong Lewis acid that adds virtually any L donor to give [Re(CO)5L]+.2i... 

As previously mentioned, monosubstitution of Ru(CO)s (2) is thermally facile, and a range of the usual L-donor ligand substituted products Ru(CO)5-nL (n = 1, 2) is prepared in this way. If L is a phosphine, it occnpies an axial position of the trigonal bipyramid see Trigonal Bipyramidal) (with... 

Scheme 4. Reaction scheme for the allyllithium-catalyzed 1,4- and 1,2-polymerization of butadiene in a weakly or noncoordinating solvent. L, donor ligand for the butadiene only the jr-coordination in the single cis form is shown.

Complexes of a variety of binaphtholate derivatives of general formulas Zr(OR)2(OC10H5R)2, Zr[(OC 10H5R)2]2L2 (R = H, Br, Cl L = donor),470 and Zr(0 Bu )2(0 Ph BrC, 0H, )2509 have been prepared. The chirality of these binaphthol derivatives has prompted applications as catalysts for enantioselective organic transformations. These included alkylation of aldehydes,510 Mannich-type reactions,511-513 allylation of imines,514-517 aza-Diels-Alder reactions,509 518 asymmetric prop-2-ynylation,519 aldol reactions,520,521 and alkene polymerization.508,522,523... 

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