Zirconocene mediated acetylboron chemistry

Zhongbao Jian; Constantin G. Daniliuc; Gerald Kehr; Gerhard Erker

doi:10.1039/c8cc02680g

Zirconocene mediated acetylboron chemistry

Chemical Communications ◽

10.1039/c8cc02680g ◽

2018 ◽

Vol 54 (45) ◽

pp. 5724-5727 ◽

Cited By ~ 2

Author(s):

Zhongbao Jian ◽

Constantin G. Daniliuc ◽

Gerald Kehr ◽

Gerhard Erker

Keyword(s):

Carbon Monoxide ◽

Major Product ◽

Zirconium Hydride

Carbon monoxide reacts with zirconium hydride and methyl–B(6F5)2 to give a Zr-bound acetyl(hydrido)borate as the major product. This reacts further with CO to form a Zr-coordinated borata-β-lactone.

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Preparation of dinuclear zirconium hydride complexes containing the fulvalene ligand and their reactions with carbon monoxide

Organometallics ◽

10.1021/om00055a045 ◽

1991 ◽

Vol 10 (9) ◽

pp. 3220-3226 ◽

Cited By ~ 12

Author(s):

Calvin J. Curtis ◽

R. Curtis. Haltiwanger

Keyword(s):

Carbon Monoxide ◽

Zirconium Hydride ◽

Hydride Complexes

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THE OXIDATION OF DI-tertiary-BUTYL PEROXIDE

Canadian Journal of Chemistry ◽

10.1139/v61-034 ◽

1961 ◽

Vol 39 (2) ◽

pp. 278-284 ◽

Cited By ~ 3

Author(s):

A. R. Blake ◽

K. O. Kutschke

Keyword(s):

Carbon Monoxide ◽

Major Product ◽

Static System ◽

Peroxy Radicals ◽

Tertiary Butyl ◽

Stationary Concentration ◽

Methyl Hydroperoxide ◽

Butyl Peroxide ◽

High Yields ◽

Butoxy Radical

The oxidation of di-t-butyl peroxide has been investigated in a static system at low conversion at 124 °C with sufficient oxygen present to suppress completely the formation of methane and ethane. The decomposition of the t-butoxy radical is unaffected by the presence of oxygen. A major product of the oxidation is formaldehyde whose yield rapidly approaches a stationary value. It is postulated that the major source of formaldehyde is the decomposition of methyl peroxy radicals, which may also abstract hydrogen from formaldehyde to form methyl hydroperoxide, and that this competition leads to the stationary concentration of formaldehyde actually observed. Methyl hydroperoxide was demonstrated to be unstable in the system and the predominant decomposition product was methanol, a compound also found in high yields in the oxidation. Experiments with added formaldehyde-C13 showed that formaldehyde can be converted to carbon monoxide in the system and indicated that formaldehyde was a likely precursor to the carbon monoxide found in the oxidation.

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Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010011043x ◽

1978 ◽

Vol 36 (1) ◽

pp. 658-659

Author(s):

G.J.C. Carpenter

Keyword(s):

Elevated Temperature ◽

Strain Field ◽

Zirconium Hydride ◽

Zirconium Atom ◽

Atom Diffusion ◽

Solvus Temperature ◽

Hexagonal Close Packed ◽

Partial Dislocations ◽

The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

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