Silver complexes carbonyls

The silver(I) carbonyl complexes [Ag(CO)]+, [Ag(CO)2]+, and the stable [Ag HB[3,5-(CF3)2pz]3 (CO)] (where pz = pyrazolyl) have been characterized spectroscopically and crystal-lographically, they indicate little or no Ag to CO 7r-back bonding. 26... 

By-products in the reactions in Table 3 are mainly cleavage products (carbonyls) An interesting by-product is found in the oxidation of styrene, as phenyl acetate is produced. It has been found that phenyl acetate is formed via oxidation of either styrene oxide or acetophenone. Nearly the same yield and stereochemical mixture of the epoxides, as in Table 3, can be obtained by oxidation with Ag202. It appears from Table 3 that the epoxidation of alkenes catalyzed by discrete silver complexes also takes place without maintaining the stereochemistry of the alkene, as in the silver-surface catalyzed reaction. 

Silver alkyls and aryls, together with silver(I) complexes of cyclic polyenes and aUcynyl ligands, are generally classified under organometallic compounds. Stable silver(l) carbonyl complexes that have been characterized by X-ray analysis include [Ag(CO) B(OTeF5)4 ], [Ag(CO)2 B(OTeF5)4 ], and [Ag(CO) HB[3,5-(CF3)2pz]3 ]. Silver acetylide (AgzCz) complexes are described in Section 3.6. 

Metal complexes have a variety of stractures. Silver complexes are often linear beryllium complexes are usually tetrahedral iron forms a carbonyl compound that has a trigonal bipyramidal structure cobalt(lll) complexes are octahedral and tantalum forms an eight-coordinated fluoride complex (Figure 3.1). Although a variety of coordination numbers and structures have been observed in metal complexes, the only common coordination numbers are four and six the common structures corresponding to these coordination numbers are tetrahedral and square planar, and octahedral, respectively. In studying metal complexes, it soon becomes clear that the octahedral structure is by far the most common of these configurations. 

Pyridazines form complexes with iodine, iodine monochloride, bromine, nickel(II) ethyl xanthate, iron carbonyls, iron carbonyl and triphenylphosphine, boron trihalides, silver salts, mercury(I) salts, iridium and ruthenium salts, chromium carbonyl and transition metals, and pentammine complexes of osmium(II) and osmium(III) (79ACS(A)125). Pyridazine N- oxide and its methyl and phenyl substituted derivatives form copper complexes (78TL1979). 

Isatin (190) is a compound with interesting chemistry. It can be iV-acetylated with acetic anhydride, iV-methylated via its sodium or potassium salt and O-methylated via its silver salt. Oxidation of isatins with hydrogen peroxide in methanolic sodium methoxide yields methyl anthranilates (81AG(E)882>. In moist air, O-methylisatin (191) forms methylisatoid (192). Isatin forms normal carbonyl derivatives (193) with ketonic reagents such as hydroxylamine and phenylhydrazine and the reactive 3-carbonyl group also undergoes aldol condensation with active methylene compounds. Isatin forms a complex derivative, isamic acid (194), with ammonia (76JCS(P1)2004). 

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