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S-H bonds

Sakaki S (2005) Theoretical Studies of C-H s-Bond Activation and Related by Transition-Metal Complexes. 12 31-78... [Pg.293]

Sakaki S (2005) Theoretical Studies of C-H s-Bond Activation and Related by Transition-Metal Complexes. 12 31-78 Satoh T, see Miura M (2005) 14 1-20 Satoh T, see Miura M (2005) 14 55-84 Savoia D (2005) Progress in the Asymmetric Synthesis of 1,2-Diamines from Azomethine Compounds. 15 1-58 Schmalz HG, Gotov B, Bbttcher A (2004) Natural Product Synthesis. 7 157-180 Schmidt B, Hermanns J (2004) Olefin Metathesis Directed to Organic Synthesis Principles and Applications. 13 223-267... [Pg.286]

Fig. 5. The wall of a column in MX(thiourea)4 complexes showing the N—H...S bonding which holds the columns and the N—H... contacts to channels containing anions... Fig. 5. The wall of a column in MX(thiourea)4 complexes showing the N—H...S bonding which holds the columns and the N—H... contacts to channels containing anions...
Fig. 15.5. Calculated potential energy curves for the lB and lA states of H2S in C -symmetry, i.e., the two H-S bond distances are varied symmetrically. The HSH bending angles are o=85°, 92°, and 100°. Note the different vertical axes for the three pairs of potential curves. Adapted from Heumann, Diiren, and Schinke (1991). Fig. 15.5. Calculated potential energy curves for the lB and lA states of H2S in C -symmetry, i.e., the two H-S bond distances are varied symmetrically. The HSH bending angles are o=85°, 92°, and 100°. Note the different vertical axes for the three pairs of potential curves. Adapted from Heumann, Diiren, and Schinke (1991).
Table 8.1 presents estimates of the differential formation energies for Af—H(s) bonds [A(—AGbF)J at various metal electrodes.3 On the basis of these and Eq. (8.7), approximate formal reduction potentials [ ,m h3o+/w-h(s)] have been estimated for the reduction of H30+ (unit activity) at die several metal electrodes (Table 8.1). In our view direct evaluations of A(—AGBF)M H(S) via electrochemistiy will provide useful insights to metal-hydrogen bonds and metal-catalyzed hydrogenations. Table 8.1 presents estimates of the differential formation energies for Af—H(s) bonds [A(—AGbF)J at various metal electrodes.3 On the basis of these and Eq. (8.7), approximate formal reduction potentials [ ,m h3o+/w-h(s)] have been estimated for the reduction of H30+ (unit activity) at die several metal electrodes (Table 8.1). In our view direct evaluations of A(—AGBF)M H(S) via electrochemistiy will provide useful insights to metal-hydrogen bonds and metal-catalyzed hydrogenations.
TABLE 8.1 Estimates of the Differential Formation Energies for M— H(s) Bonds [A(-AGBF>] at Metal-Electrode Surfaces [M(s>], and Approximate Formal Reduction Potentials for H30+ at Metal Electrodes (E Hjo+/a/-h)... [Pg.345]

The isomers shown in Figure 2.4 have the maximum number of hydrogens possible for a compound with six carbons. The maximum number of H s can easily be calculated from the number of C s present. To see how the formula arises, consider a straight, or linear, chain of some nmnber of C s. Each C has two H s bonded to it, with the exception that the two end C s have one additional H, because they are bonded to only one C. Therefore, for n carbons, the maximum number of hydrogens is 2n + 2. The general formula for a hydrocarbon with the maximum number of hydrogens is C H2 +2- As an example, C5H12 has the maximum number of H s for 5 C s [2(5) + 2= 12],... [Pg.39]

The broad absorption centered near 3300 cm-1 indicates the presence of a hydroxy group. The absorption at 3005 cm-1 suggests the presence of H s bonded to s/r-hybridized C s. (Note that you are not expected to read peak positions this exactly from any of these spectra.) This is supported by the absorption for a CC double bond at 1646 cm-1. The absorptions in the region of 3000 to 2850 cm-1 indicate the presence of H s bonded to s/r -hybridized C s. Although the compound has a CC double bond, there is no indication of the presence of an aromatic ring due to the absence of the four bands in the 1600 to 1450 cm-1 region and the absence of bands in the 900 to 675 cm-1 region. [Pg.531]

The bond strength of these N— H S bonds is not directly accessible by experiment. However, it has been estimated that they contribute 70 kJ mol-1 to the total stabilization of coordinated N2H2 (47, 126). This estimate is corroborated by recent DFT calculations (134), which support the assumption that N—H S bridges are a significant factor for stabilizing diazene in [M(S )]—N2H2 complexes. [Pg.647]


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See also in sourсe #XX -- [ Pg.70 ]




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Breaking S-H Bonds

Persistence of N-H... S Hydrogen Bonding in Thiocarbamide Structures

S Bond

S-H bonds, activation

S-bonding

S—H bond, cleavage

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