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Digitale Medien

Isotopically selective IR multiphoton dissociation of 1,3,5-trioxane (1996)

Churakov, V. ; Fuss, W.

Springer

Applied physics 62 (1996), S. 203-212

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ISSN: 1432-0649

Schlagwort(e): 33.80.Wz

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Searching for oxygen-isotope selectivity, we investigated the infrared multiphoton dissociation of the formaldehyde trimer around 10 µm, in a range where the molecule has a degenerate and a non-degenerate CO stretch vibration and a degenerate CH2 deformation vibration. In the region of the two latter, the wavelength dependence of the dissociation yield exhibits sharp structures. They were assigned ton-photon resonances (n = 2, 3, 5) by the help of the IR spectrum in the fundamental and overtone region. The O and C selectivities were very small (1.05) near the non-degenerate CO stretch band, but surprisingly large (2–4) in the CH2 deformation, which has no isotopic shift. The selectivity is not controlled by the first (n-photon) excitation step, but only by a later step. Its assignment is attempted. The pressure dependence of the dissociation is peculiar: Only after an initial decrease, the yield exhibits the usual rise with pressure. We attribute the decrease to a relaxation which perturbs the two-photon resonance.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01081126

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Digitale Medien

Trimethylsilylation and methylation of 1-hydroxybenzotriazole 3-oxide (1995)

Ioffe, S. L. ; Fedorov, A. E. ; Strelenko, Yu. A. ; [weitere]

Springer

Russian chemical bulletin 44 (1995), S. 2190-2192

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ISSN: 1573-9171

Schlagwort(e): 1-hydroxybenzotriazole 3-oxide ; 1-methoxybenzotriazole 3-oxide ; trimethylsilyl derivative of 1-hydroxybenzotriazole 3-oxide ; silylation ; methylation ; 1,5-O,O-migration of the SiMe3 group

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Trimethylsilylation and methylation of 1 -hydroxybenzotriazole 3-oxide (1) proceed regioselectively and afford 1-trimethylsilyloxy- and 1-methoxybenzotriazole 3-oxides, respectively. The first compound easily undergoes fast hydrolysis and methanolysis, but does not react with nitroethane at 20 °C. A fast reversible 1,5-O,O-migration of the SiMe3 group is observed for this compound.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00696731

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Digitale Medien

Synthesis and properties of ansa-titano- and ansa-zirconocenes (1993)

Churakov, A. V. ; Nifant'ev, I. E. ; Urazovskii, I. F. ; [weitere]

Springer

Russian chemical bulletin 42 (1993), S. 928-931

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ISSN: 1573-9171

Schlagwort(e): ansa-titanocenes and ansa-zirconocenes ; synthesis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract A series of methyl and allyl derivatives of ansa-titano- and ansa-zirconocenes with isopropylidene or dimethylsilyl bridging groups were synthesized. A dinuclear complex, [Me2C(C5H4)2]2Ti2O2, resulting from the thermal decomposition of the corresponding dimethyl derivative of ansa-titanocene in the air, was characterized by X-ray diffraction analysis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00698963

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