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Donor hydrogenation

Provencal R A ef a/1999 Infrared cavity ringdown spectroscopy of methanol clusters single donor hydrogen bonding J. Chem. Phys. 110 4258-67... [Pg.1176]

H-bond acceptor = H-bond donor = hydrogen atom = methyl group... [Pg.124]

The special salt effect is a constant feature of the activation of substrates in cages subsequent to ET from electron-reservoir complexes. In the present case, the salt effect inhibits the C-H activation process [59], but in other cases, the result of the special effect can be favorable. For instance, when the reduction of a substrate is expected, one wishes to avoid the cage reaction with the sandwich. An example is the reduction of alkynes and of aldehydes or ketones [60], These reductions follow a pathway which is comparable to the one observed in the reaction with 02. In the absence of Na + PFg, coupling of the substrate with the sandwich is observed. Thus one equiv. Na+PFg is used to avoid this cage coupling and, in the presence of ethanol as a proton donor, hydrogenation is obtained (Scheme VII). [Pg.61]

The observed increase in CH formation and simultaneous decrease in CO formation with increasing catalyst potential and work function i.e. with increasing supply of O2 to the catalyst is remarkable and can be attributed to the preferential formation on the Rh surface of electron donor hydrogenated carbonylic species leading to formation of CH4 and to the decreasing coverage of more electron acceptor carbonylic species resulting in CO formation.59... [Pg.408]

Methods that deduce a pharmacophore, an arrangement in 3D space of features that contribute or detract from binding and look for its presence in the database that is searched. This method places emphasis on features like hydrogen bond donors, hydrogen bond acceptors, acidic or basic units and hydrophobic fragments and opens the possibility of identifying unexpected scaffolds with required features (pharmacophore-based VS or PHBVS). [Pg.88]

Sorption complex Electron pair donor Hydrogen bond Ion pair (hydrogen... [Pg.103]

Prausnitz and coworkers [91,92] developed a model which accounts for nonideal entropic effects by deriving a partition function based on a lattice model with three categories of interaction sites hydrogen bond donors, hydrogen bond acceptors, and dispersion force contact sites. A different approach was taken by Marchetti et al. [93,94] and others [95-98], who developed a mean field theory... [Pg.512]

The proton-acceptor capability of some 2-acetylselenophenes in dilute sulfuric acid has been determined by the 1H NMR method.97 With phenol as proton donor, hydrogen-bond formation can be studied using IR spectroscopy as the analytical method.98 Intramolecular hydrogen-bond formation... [Pg.151]

An alternative approach by Zhu et al. (1990) yielded a similar activation energy (for P), while providing new information on the donor-hydrogen dissociation reaction. With electrical measurements they studied the electric-field induced migration of hydrogen that is thermally released from PH... [Pg.136]

In the first report of hydrogen neutralization of donor dopants in silicon, a novel bonding geometry was proposed for the donor-hydrogen complex... [Pg.139]

Fig. 6. Structural models for the donor-hydrogen complex in silicon (a) the antibonding Td site model and (b) the broken-bond Td site model (adapted from Zhang and Chadi, 1990a). Fig. 6. Structural models for the donor-hydrogen complex in silicon (a) the antibonding Td site model and (b) the broken-bond Td site model (adapted from Zhang and Chadi, 1990a).
Fig. 23. Schematic representation of the group IV donor-hydrogen complex with hydrogen in AB site. The black spheres represent the group V atoms (As), the large white ones the group III atoms (Ga), the small white one the hydrogen atom and the dotted sphere the impurity. The lone pair on the threefold coordinated group V atom is not represented. Fig. 23. Schematic representation of the group IV donor-hydrogen complex with hydrogen in AB site. The black spheres represent the group V atoms (As), the large white ones the group III atoms (Ga), the small white one the hydrogen atom and the dotted sphere the impurity. The lone pair on the threefold coordinated group V atom is not represented.
R. A. Provencal, J. B. Paul, K. Roth, C. Chapo, R. N. Casaes, R. J. Saykally, G. S. Tschumper, and H. F. Schaefer III, Infrared cavity ringdown spectroscopy of methanol clusters Single donor hydrogen bonding. J. Chem. Phys. 110, 4258 4267 (1999). [Pg.46]


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See also in sourсe #XX -- [ Pg.309 ]




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1- Hexen hydrogen donor

A Detailed Look at the Hydrogen Bond Donor Features of HFIP

Acetic acid, alkyne hydrogenation, hydrogen donor

Acid-base chemistry hydrogen bond donor

Alcohols as hydrogen donors

Aldehydes hydrogen donors

Aldol chiral hydrogen bond donors

Alkane production, hydrogen donor

Alkane production, hydrogen donor solvent

Aromatic hydrogen donors

Benzyl alcohols hydrogen donor

Bifunctional catalysts hydrogen-bond-donor asymmetric

C-H hydrogen-bond donors

CH Donor Hydrogen Bonds

Catalysis multiple-hydrogen-bond-donor

Cation-Radicals as Acceptors or Donors of Hydrogen Atoms

Chain-breaking hydrogen donor

Chiral Squaramides as Hydrogen-Bond Donor Catalysts

Conjugate reduction hydrogen donors

Conventional hydrogen bond donors

Cosolvents, hydrogen-bond donor

Cyclohexadiene, 1,4-, hydrogen donor

Cyclohexadiene, 1,4-, hydrogen donor transfer hydrogenolysis

Cyclohexene hydrogen donor

Cyclopentadienes hydrogen-bond donor catalysed

Donor acceptor isomerism, hydrogen bonds

Donor hydrogenation product yields

Donor hydrogenation, reactions during

Donor quasi-hydrogenic

Donor-acceptor dyads, hydrogen-bonded

Donor-acceptor pairing hydrogen bonding

Donors, hydrogen binding

Electron Transfer in Hydrogen-Bonded Donor-Acceptor Supramolecules

Formates as hydrogen donor

Halogen/hydrogen donors

Hydrazine hydrogen donor

Hydrogen Bond Donor Features of HFIP

Hydrogen Bonding Donors and Acceptors

Hydrogen Donor Abilities of Silicon Hydrides

Hydrogen Donor Abilities of the Group 14 Hydrides

Hydrogen Evaluation Involving Ligands as Proton Donors

Hydrogen acceptor / donor

Hydrogen atom donor, and

Hydrogen atom donors

Hydrogen bond donor acidity

Hydrogen bond donor feature

Hydrogen bond donor/acceptor

Hydrogen bond donor/acceptor sites

Hydrogen bond interactions donor group

Hydrogen bonding donors

Hydrogen bonds proton donors

Hydrogen donor

Hydrogen donor ability

Hydrogen donor charged surface area

Hydrogen donor density

Hydrogen donor reactions

Hydrogen donor solutes

Hydrogen donor solvent, effect

Hydrogen donor-acceptor center

Hydrogen donors Bu3SnH radical

Hydrogen donors Subject

Hydrogen donors alcohols

Hydrogen donors ammonium formate donor

Hydrogen donors catalytic reactions

Hydrogen donors formic acid

Hydrogen donors fundamental properties

Hydrogen donors hydrocarbons

Hydrogen donors properties required

Hydrogen donors rate constants

Hydrogen donors thiols

Hydrogen donors tools for the determination of POase activity in enzyme immunoassays

Hydrogen donors unexpected

Hydrogen donors, nonthermal reactivities

Hydrogen fluoride, proton-donor

Hydrogen-bond acceptors interactions with donors

Hydrogen-bond donors

Hydrogen-bond donors enthalpies

Hydrogen-bonded donor-acceptor pairs

Hydrogen-bonding donor charged surface

Hydrogen-hond donor

Hydrogenation ammonium formate donor

Hydrogenation ammonium formate hydrogen donor

Hydrogenation hydrogen donors

Hydrogenation hydrogen donors

Hydrogenation reactions during donor solvent

Indoline hydrogen donor

Kamlet-Taft hydrogen-bond donor

Molecular descriptor hydrogen-bonding donor atoms

N-H hydrogen-bond donors

Noncovalently Linked Donor-Acceptor Pairings via Hydrogen-Bonding Interaction

Number of hydrogen bond donors

Organocatalysts hydrogen-bond-donor

Organocatalysts hydrogen-bond-donor asymmetric

Other Hydrogen Donors

Oxygen donors hydrogen peroxide

Poly hydrogen donor

Preorganized hydrogen bond donors

Proton donors, hydrogen-bonded complexes

Pyrrolidine hydrogen donor

Reduction Reactions Involving Hydrogen Atom Donors

Reduction by hydrogen atom donors

Role of Phenol as Hydrogen Donor

Role of Urea and Thiourea as Hydrogen Donors

Shallow donors hydrogen model

Sodium formate hydrogen donor

Solvents hydrogen bond donor

Structural descriptors hydrogen-bonding donor atoms

Tetrahydroquinoline hydrogen donor

Thiols as hydrogen donors

Transfer hydrogenation ammonium formate hydrogen donor

Transfer hydrogenation hydrogen donors

Triethylsilane hydrogen donor

Triplet-State Radical Pairs from the Photoreduction of Benzophenone by Hydrogen Donors

Water as hydrogen-bond donor

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