Co-carbonylations

Neutral ligands, such as H2NCH2CH2NH2 (ethylenediamine), have the same name as the molecule, except for HzO (aqua), NH (ammine), CO (carbonyl), and NO (nitrosyl). 

The particle size depends on the chain length of the aluminium-alkyl group and the concentration of the tri-alkylaluminium compound applied. If mixtures of, e.g., Fe- and Co-carbonyl compounds are used, Fe/Co alloy particles are formed. When the magnetic particles... 

Hydroformylalion of acrylonitrile Co-carbonyl complex NC(CH2)2CH0 Food products... 

Small Co metal clusters Cora (ra = 2-8) react with CO, with sequential addition leading to the saturated Co species [Co2(CO)7], [Co3(CO)i0], [Co4(CO)i2], [Co5(CO)13] and [Co6(CO)i5]-.71 This points towards one of the features of low-valent Co carbonyls a tendency to form stable clusters. Reactivity of Co with 02 is higher but leads to cluster fragmentation, whereas N2 is essentially unreactive. Entry into carbonyl chemistry of low-valent Co is frequently via the well-known dimer Co2(CO)8. A range of reactions commencing with this compound has been developed, as follows. 

Mononuclear acyl Co carbonyl complexes ROC(0)Co(CO)4 result from reaction of Co2(CO)8 with RO-.77 These also form via the carbonylation of the alkyl precursor. The ROC(0)Co(CO)4 species undergo a range of reactions, including CO ligand substitution (by phosphines, for example), decarbonylation to the alkyl species, isomerization, and reactions of the coordinated acyl group involving either nucleophilic attack at the C or electrophilic attack at the O atom. 

Dendrimers incorporating Co carbonyls and other organocobalt species have been the subject of a recent review.91 This sets the scene for a likely growth of interest in such systems in the future. 

Although Co carbonyl complexes have been used most often in catalytic PKR, a variety of other transition metal complexes are able to catalyze this reaction. For instance, Cp2Ti(PMe3)2 [36] and Ni(0) catalysts [37] have been reported to afford iminocyclopentenes by the use fBuMe2SiNC instead of CO. Subsequent hydrolysis provides the desired cyclopentenones. Unfavorably, the isolated product yield decreases significantly when applying this reaction sequence. 

Ru, RuCo, and Co carbonyl cluster-derived catalysts, 38 362-363 structural model, 38 366-367 synthesis gas conversion, 38 364-365 ZSM-5-supported Pd catalysts, 39 207-208... 

COS CARBONYL SULFIDE 36.8556 -1.7187E+03 -1.2036E+01 8.9612E-03 2.0283E... 

Carbon monoxide, like hydrogen, readily coordinates to transition metal centers. Consequently, cycles such as 18.10 can be used to catalyze the addition of CO (carbonylation) as well as hydrogen to a terminal —CH=CH2 function, giving an aldehyde ... 

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