Metal hydrides reacting with

When a transition-metal hydride reacts with EtZnCl the organic moiety, rather than the halogen, is replaced ... 

Another species that is a strong base is the hydride ion, H-. Metal hydrides react with water to produce basic solutions ... 

Alkali metal hydrides react with diborane to form metal borohydrides B2He+2NaH 2NaBH4... 

Ionic metal hydrides react with water to give hydrogen gas and an aqueous solution of the metal hydroxide. 

A variety of metal hydrides react with water at ambient temperature to produce high purity hydrogen. Examples of reactions are ... 

Some ruthenium, osmium and iridium metal hydrides react with diarylcarbodiimides to give products containing N,N -diarylformamidinate ligands. ... 

A wide variety of hydrides act as H atom donors for example, the key step in the hydrogenation of alkenes by [HCo (CN)5] is known to go in this way (equation 19). A number of metal hydrides react with CCI4 to give CHCI3 and the metal halo complex. The mechanism may involve electron transfer, followed by H atom abstraction from the metal by CCI3. 

Transition-metal hydrides react with nitrogen compounds to form N—H bond-containing organometallic products. The [HFe3(CO),J cluster anion reacts with nitriles to form a coordinated RCNH species, along with the RCHN-coordinated isomer ... 

Transition-metal hydrides react with olefins to form (T-bonded derivatives h -CpFeteO H + C F - h5-CpFe(CO)jC2F H PtHfClXPEtj) + CjH, -- P(C2H5)Cl(PEt3)2 RhH(CO)(PPh,)3 + MeCHCH, - PPh, + Rh(MeCH,CH,)(CO)(PPh3),... 

Under similar conditions metal hydrides react with Al and H to afford the Na", Li+, K and Cs salts ... 

Complex Metal Hydrides Reacting with Acids... 

With the preparation of lithium aluminum hydride, Schlesinger and coworkers not only opened wide fields of work in organic chemistry, but provided improved methods for the preparation of many hydrides (11). In general, the reaction of lithium hydride or lithium aluminum hydride to form other hydrides is a metathesis of the following form, where a metal hydride reacts with the salt of another metal to give a metal-metal interchange ... 

When a transition metal alkyl or a metal hydride reacts with olefin molecules to undergo successive insertions, chain growth of a polymer attached to the transition metal takes place. If -hydrogen elimination occurs from the polymer chain, a transition metal hydride coordinated with the olefin derived from the polymer chain will be produced. By displacement of the coordinated olefin from the transition metal by the other monomer olefin, the polymer with an unsaturated terminal bond is liberated with generation of a transition metal hydride coordinated with the olefin. New chain growth will follow from the hydride, with the net result of control of the molecular weight without termination of the polymerization process. The process is in fact a chain transfer process. 

Mechanistic investigations with special nickel complex catalysts have shown that nickel hydrides with chelating P-0 groups are the catalytically active species. The metal hydride reacts with ethylene to give alkylnickel intermediates, which can grow further by ethylene insertion or eliminate the corresponding a-olefins. A simplified mechanism is shown in Scheme 3-8 [9],... 

Some metal-hydrides react with acidic reagents. For example, the HMn(CO)j formed by the protonation of Mn(CO)j evolves when dissolved in pure CF3SO3H (in Equation... 

The hydridic metal hydrides react with alcohols to yield hydride-alkoxides or binary alkoxides depending on the amounts of alcohols used. 

FIGURE 16.58 Metal hydrides react with water to generate hydrogen, and are often strong enough nucleophiles to displace halides and generate hydrocarbons. 

Organometallic reagents and metal hydrides react with esters in still another example of the addition—elimination process. Usually, these strong nucleophiles react further with the ketones that are the initial products of the reactions (Fig. 18.35). The ketones are not as well stabilized by resonance as are the esters and so are more reactive in the addition reaction. 

Early transition-metal akyl and hydride complexes grafted on silica catalyze alkane disproportionation by o-bond metathesis. For instance, a metal-hydride reacts with an alkane to yield a metal-alkyl on silica, then combination of C-H a-bond metathesis with a and (3-H eliminations leads to alkane metathesis (disproportionation), the mechanism involving metal-carbenes and metallocyclobutanes as for olefin metathesis. 

Water-reactive chemicals. Certain chemicals, including sodium, potassium, and many metal hydrides, react with water, producing heat and flammable gases. Other chemicals may burn upon contact with water. Storage areas used to hold water-reactive chemicals should be designed to prevent accidental contact with water. For example, these areas should not be equipped with automatic water sprinkler systems. Segregate water-re-active chemicals from other combustible materials, and be certain that the area is of fire-resistant construction. 

---