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Imido compounds

Redistribution reactions between 28 and 29 to form mixed-imido compounds were not detected. On the other hand, oxo-imido interchange reactions readily take place between MeRe03 and 29. As a consequence, new compounds are formed, MeReO(NR)2, 30, and MeRe02NR, 31. The product obtained is largely under stoichiometric control, as represented by these equations (62) ... [Pg.196]

This is a stepwise process during which two mixed oxo-imido compounds were detected, MeRe(0)2NAr, 31, and MeReO(NAr)2, 32. These intermediates could be prepared independently, as described in the preceding section. The first stage is,... [Pg.198]

Together with Schrock s molybdenum-imido compound 50 ° the ruthenium-phosphine complexes 51 and especially 52 developed by Grubbs " proved to be an outstanding achievement in the development of molecular catalysts for olefin metathesis reactions (Scheme 10). [Pg.36]

The purpose of this step is to hydrolyze any alkyl imido (compound that may have formed from the further reaction of tlu sulfamide. ... [Pg.87]

The ability of multiple 7r-donors to stabilize high oxidation states has been used in the preparation of the first poly(imido) compounds of While this type of compound has... [Pg.138]

In earlier sections it has been shown that the reaction of a magnesium dialkyl with one equivalent of a primary amine usually affords the primary amido derivative. However, it is also possible to effect elimination of the second equivalent of alkane to give magnesium imides. The reaction of MgEt2 with aniline in thf proceeded via an amido intermediate which eliminated ethane to yield the hexameric imido compound [ (thflMgNPhJg] which was the first homometallic magnesium imide to be structurally characterized. Equation (3.9). [Pg.59]

With the more bulky amine Bu NH2, only partial substitution leads to discrete mixed amido-imido compounds (equation 39), 67... [Pg.166]

The direct aminolysis of metal oxides with primary amines is a useful synthetic route for imido compounds of rhenium and osmium (equation 41). [Pg.166]

By abstracting the elements of ammonia from the di- and tri-amidophosphoric acids, a series of imido-compounds has been prepared these are represented by ... [Pg.708]

Dimeric 7r-arene-bridged samarium anilide [Sm(NHArl Pr,H)3]2 was employed in the isolation and characterization of a dimeric amido-imido compound. Addition of 4 equivalents of TMA led to (1) cleavage of one of the Ln-NHPh bonds, (2) deprotonation, and (3) adduct formation. Density functional theory calculations, carried out in order better to understand the nature of the imido bonding, revealed the presence of Sm - N 7r-bonding interactions involving the samarium 5d orbitals [218]. [Pg.215]

Imido compounds have been made by interaction of amines with Grignard or dimagnesium compounds. The reaction with Grignards gives what are termed magnesylamines. ... [Pg.126]

Just as deprotonation of NH3 gives the sequence NH3 —> NH2 —> NH2 N3-, alkyl or aryl amines give the NHR- and NR2 species of the last section and finally NR2- which is isoelectronic with O2. There is, however, a difference in that imido ligands can be either linear or bent (see below). In imido compounds the R groups can be H, alkyl, aryl, tosylate, CR2OH, CH2CH=CH2, 1-pyrolylimido, etc. [Pg.363]

Such complexes have been referred to as nitrene complexes but, strictly, nitrenes are RN species and while zero valent NR compounds have been reported, none has been isolated. Imido compounds are commonly found in transition metal complexes with oxidation states 3 and above. The high capacity for electron donation by the imido group does of course, like that of O2-, act to stabilize high oxidation states prime examples of this are Os(NBu )4 vs. 0s04 and (Bu N)3MnCl vs. 03MnCl. [Pg.363]

Imido compounds can be obtained by many different methods.142 Much used routes are RN transfer reactions using organic thiocyanates, RNCO, phosphineim-ines, R3P=NR, hydrazines, RNHNHR, silylamines, or RNH2 in presence of Me3SiCl in THF, dme, or similar solvents. Examples are... [Pg.364]

Although imido compounds of transition metals have long been known, they had other ligands present. Homoleptic compounds145 have been made by the reac-... [Pg.364]

Organic azides, RN3, usually react losing N2 to give imido compounds (Section 9-16), but an azide intermediate has been isolated and characterized in the reaction203 ... [Pg.377]

Whereas Groups 5-7 metals form numerous complexes with M=E double bonds, this feature has been less prominent in Group 4. However, an increasing number of titanium imido compounds have recently been prepared 41... [Pg.703]

The Cl atom in MnCl(NBu )3 can be substituted by Br, 02CR, OCH(CF3)2, SC6F5, CjFj, and NHBu all of these compounds are green. As noted earlier (Section 17-D-5), reduction of MnCl(NBu )3 can give Mnv and Mn 1 binuclear complexes. The principal reactions are shown in Fig. 17-D-3. Over 40 imido compounds are now known. [Pg.773]

These include pyrazolylborates such as Tp RuH(H2)2,31 and diazadiene compounds of RN=CR —CR =NR ligands.32 Nitrido and imido compounds are discussed in Section 18-F-ll there are a few amido complexes known.33... [Pg.1019]

Bums and coworkers have discovered a remarkable reaction involving Cp 2U(Me)Cl. Treatment of the latter with l-lithio-l,2-diphenylhydrazine in ether solution generates lithium chloride and methane, and provides the uranium(VI) bis-imido compound Cp 2U(NPh)2, conceivably via a uranium(lV) hydrazido species Cp 2U( ] -PhNNPh)." A plausible reaction sequence is laid out in equations (61) and (62). Cp 2U(NPh)2 was the first uranium(Vl) organometallic complex. In the solid state, Cp 2U(NPli)2 adopts the famihar... [Pg.49]


See other pages where Imido compounds is mentioned: [Pg.266]    [Pg.435]    [Pg.436]    [Pg.161]    [Pg.146]    [Pg.281]    [Pg.306]    [Pg.322]    [Pg.737]    [Pg.55]    [Pg.619]    [Pg.162]    [Pg.175]    [Pg.182]    [Pg.183]    [Pg.20]    [Pg.204]    [Pg.167]    [Pg.55]    [Pg.100]    [Pg.365]    [Pg.365]    [Pg.1025]    [Pg.1031]    [Pg.1033]    [Pg.22]    [Pg.2517]    [Pg.339]   


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Half-sandwich Imido Compounds of Niobium and Tantalum

Imido

Imido compounds cycloadditions

Imido half-sandwich compounds

Imido selenium compounds

Imido sulfur compounds

Imido titanium compounds

Osmium imido compounds

Rhenium imido compounds

Technetium imido compounds

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