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Alkyl ligands form metal carbon σ bonds. Usually they occur in conjunction with other organic ligands or CO, but may be achieved on their own, as in tungsten hexamethyl (1), and in [Ti(CH2SiMe3)4] where the bulky groups are helpful in stabilizing the compound. Elements with H attached to β carbons (the nomenclature being M-Cα-Cβ-Cγ) tend to be unstable to β-hydride elimination of an alkene fragment, defined below. The surprising structure of (1), trigonal prismatic (D3h) rather than octahedral as collect in WCl6, has been attributed to the orientation of d orbitals accept for σ bonding. In an octahedral complex only two d orbitals may be involved, but four in the trigonal prismatic structure.
Alkylidyne and alkylidene ligands need metal-carbon π bonding in addition to σ.
Among the many reactions of organometallic elements, ones having elimination and insertion of ligands are important in applications to synthesis and catalysis. As like carbonyl insertion is:
in which a Mn-CH3 bond is changed by Mn-C(O)-CH3. The terminology is misleading as it is published by isotopic labeling that the incoming CO is not the one inserted. The first step is a opposite alkyl migration leading to a 16- electron intermediate which then picks up another CO molecule as show in 8.
Fig. Reaction steps involved in the catalytic Monsanto acetic acid process.
The ph of an aqueous solution of Ba(OH)2 is 10 if the ksp of Ba(OH)2 is 1*10^-9 then the concentration of Ba+2 ions in the aqueous solution is Ans) [OH(-)] = 10^(-4) 2.
Q. Explain about Optical Isomerism? Optical Isomerism: -Two isomers which have almost identical physical and chemical properties like mp. B p. density. Colour etc.. But diffe
When sodium and chlorine reacts then: (1) Energy is released and ionic bond is formed (2) Energy is released and a covalent bond is formed (3) Energy is absorbed and ioni
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given that ksp of MG(OH)2 is 0.000000000089,calculate the solubility of Mg(OH)2 in a solution buffered at pH=9
discovery of neutron becomes very late because
Q. Illustrate Aromatics compounds? Ans. Benzene (C 6 H 6 ) is the prototype of an important class of hydrocarbons called aromatic compounds. Benzene is a ring of 6 carbon
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Q. Briefly explain acid-base titration ? Ans. A valuable laboratory technique used by chemists is called an acid-base titration. A titration is a process in which the c
Conductance and conductivity: When a field (electric) is put across an aqueous ionic solution by applying a voltage between two parallel plate electrodes, the cations are attra
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