<b>The Kinetics of the Pyrolysis of Carbon Monoxide Borane</b>

Fu, Yuan-Chin; Hill, George R.

doi:10.1021/ja00862a007

Cited by 11 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the form that would appear most susceptible to nucleophilic attack (by PPh 3 liberated in the first step) would involve a dissociated CS group. Although the thiocarbonylboranes R 3 B←CS do not appear to have been considered in the literature, H 3 B←CO is well documented, including the activation of the CO “ligand” toward nucleophiles: e.g., amines . The final step involving coordination of the thione group to rhodium could in principle occur in a σ-S or (as observed) π-C , S manner .…”

mentioning

confidence: 99%

Metallaboratranes: The M→B Dative Bond as a Ligand Activating Function in the Phosphaboration of Carbon Monosulfide

2007

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

Metallaboratranes: The M→B Dative Bond as a Ligand Activating Function in the Phosphaboration of Carbon Monosulfide

2007

View full text Add to dashboard Cite

show abstract

“…Also traces of impurities in the gas stream are often found to increase the yield of atoms substantially above those obtained from highly pure gases. Earlier theories as to the mechanism of the latter effect assumed the formation of short-lived intermediate compounds, but more recently Kaufman, et al, 12 have ascribed the influence of such impurities to their adsorption on the walls and the subsequent change in the surface recombination efficiency; i.e., they func- tion as wall poisons. In the case of the halogen atoms it has been established that water molecules are efficient third bodies for atom recombination in the gas phase and that oxyacids on the walls act as poisons.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the reactions of atomic and molecular halogens with silver

McTaggart¹

1970

J. Phys. Chem.

View full text Add to dashboard Cite

“…The kinetics of addition of diborane to phosphine and of diborane to carbon monoxide have been studied5, 6. As yet, the relative acidity of boron trichloride and boron trifluoride as…”

mentioning

confidence: 99%

Kinetics of Rapid Gas Phase Reactions. The Addition of Lewis Acids to Bases

Bauer¹,

Martínez²,

Price³

et al. 1963

View full text Add to dashboard Cite

ii) For such encounters, description of the distortions which occur in their structures, particularly in the acid molecule.iii) Estimation of the probability for the redistribution of energy from vibrational and internal rotational modes in which large amplitudes are localized around the newly formed bond to modes in which large amplitudes appear in cther parts of the molecules. Consider dependence of this stabilization on the detailed composition and geometry of the reactants; is there a need for a third boay? iv) Estimation of the probability for the redistribution of energy from the vibratlonally excited product molecule to the ambient gas, relative to the probability for the re-accumulation of energy in the newly formed bond, and consequent dissociation. Consider dependence of this de-energization on the nature and concentration of the ambient gas.v) Estimation of the probability for the exchange reactions:AB 1 + B 2 -oAB 2 + B, and of AIB + A 2 ---PA 2 B + A,.Compare these rates with that of precipitation of AB 1 and AIB.vi) Description of the formation of crystal embryos and nuclei, and of the rate of growth of Lewis salt crystals. Consider possible re-evaporation of reac'ant species from these hot crystals due to insufficiently rapid trunsfer of the heat of condensation to the ambient gas. In the following papers attempts have been made to obtain experimental answers to some of the questicns raised. We have been only partially successful, and much work remains to be done.The last paper included in this final repcrt summarizes computational work by Mr. Nicholas Rol.Since the association mechanism in the gas phase of aliphatic acid monomers presumably has a number of kinetic features similar to that of Lewis acidbase adduct formation, the possibility of measuring these rates should be investigated.Mr. Rol considered the feasibility of exploiting shock tube techniques.We here express our sincere appreciation to the Office of Naval Research for the extended support given to this project.We are particularly thankful for the personal interest shown in our research efforts. It was demonstrated that the pair BFs-B 2 He are compatible in the sense that these gases do not react with each other to produce new substances and that the product of reaction with trimethylamine, in each case, is unaffected by the presence of the other acid. The ratio of the overall rates of addition _RIs-NMes/RB2He-NMes increases with rising temperature, rather than decreases, as is expected were a displacement mechanism operative, such as:NMes + BraHe MesN:BHs + BHK Also, this ratio decreases with increasing pressure of the amine but for constant amine and acid concentrations is independent of the ambient pressure (N 2 diluent). (kf/ka) -2.2, and, log (kfAakb) --6.620 -271.7/T An analysis of these results will be presented.

show abstract

The Kinetics of the Pyrolysis of Carbon Monoxide Borane

Cited by 11 publications

References 0 publications

Metallaboratranes: The M→B Dative Bond as a Ligand Activating Function in the Phosphaboration of Carbon Monosulfide

Metallaboratranes: The M→B Dative Bond as a Ligand Activating Function in the Phosphaboration of Carbon Monosulfide

Comparison of the reactions of atomic and molecular halogens with silver

Kinetics of Rapid Gas Phase Reactions. The Addition of Lewis Acids to Bases

Contact Info

Product

Resources

About