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Digitale Medien

Improved separation of the rare sulfur isotopes by infrared multiphoton dissociation of SF6 (1987)

Bello, U. ; Churakov, V. ; Fuß, W. ; [weitere]

Springer

Applied physics 42 (1987), S. 147-153

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ISSN: 1432-0649

Schlagwort(e): 82.50 ; 33 ; 35

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The dissociation probabilities of32SF6 and some of34SF6 have been measured at a large number of CO2 laser lines both at room temperature and at 140 K. The longwavelength wing of this dissociation spectrum is exponential in the wavenumber. Its logarithmic slope is proportional to the inverse temperature. Selectivities are high enough at 140 K, that the photons are consumed only for the rare isotope in the case of34SF6 and nearly so for36SF6. For33SF6 further improvement of the selectivity would be desirable.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00693876

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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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Digitale Medien

Spectroscopic study of fused 1,2,3,4-tetrazine 1,3-dioxides (1995)

Rezchikova, K. I. ; Churakov, A. M. ; Shlyapochnikov, V. A. ; [weitere]

Springer

Russian chemical bulletin 44 (1995), S. 2093-2095

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ISSN: 1573-9171

Schlagwort(e): furazano- and benzo-1,2,3,4-tetrazine 1,3-dioxides ; IR and Raman spectra

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Vibrational spectra of furazano- and benzo-1,2,3,4-tetrazine 1,3-dioxides were studied, and the main regularities of the changes in frequencies of stretching vibrations of the tetrazine dioxide fragment with respect to the nature of the substituent in the benzene ring were established.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00696710

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