FTIR Studies of O(<sup>3</sup>P) Atom Reactions with CSe<sub>2</sub>, SCSe, and OCSe
作者:Shuping Li、Tsz Sian Chwee、Wai Yip Fan
DOI:10.1021/jp055113p
日期:2005.12.1
literature value of the rate coefficient for O(3P) with CS2 (4 x 10(-12) cm3 molecule(-1) s(-1)). A product channel giving OCSe in 32.0 +/- 4.2% yield has been found for the O + CSe2 reaction. Although CO was also detected, its generation could be attributed to subsequent reactions of OCSe with Oatoms. The corresponding reaction for O + SCSe gives OCS and OCSe as observable products, with their yields
Determination of the dissociation energy of selenium monoxide by the mass-spectrometric knudsen-cell method
作者:Simonne Smoes、Jean Drowart
DOI:10.1039/f29848001171
日期:——
Se2(g)+ SO(g) has been studied by the mass-spectrometric Knudsen-cell method in the temperature interval 1300–1800 K. It leads to the thermochemical value D°0(SeO)= 426.4 ± 6.3 kJ mol–1 for the dissociationenergy of the molecule SeO(g). By comparison with spectroscopic data, D°0(SeO)= 424.7+0.6–6.0 kJ mol–1 is retained as best present estimate of the dissociationenergy. The corresponding enthalpy of formation
bands of the a1Δ(a2)-X3Σ−1(X21) system of SeO has been observed near 5200 and 4300 cm−1. The emission was excited in a discharge flow system by energy transfer from O2(a1Δg) to ground state SeO molecules. The 0-0 band has been recorded at high resolution with a Bomem interferometer and a rotational analysis has been carried out. The following spectroscopic constants were obtained for the a1Δ(a2) state
Pyrimidinyl cephalosporanic acid derivatives and pharmaceutical
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04395411A1
公开(公告)日:1983-07-26
This invention relates to novel 7-pyrimidinyl and pyridinyl acetamido cephem derivatives of high antibacterial activity.
本发明涉及一种具有高抗菌活性的新型7-嘧啶基和吡啶基乙酰胺头孢菌素衍生物。
Epothilone synthesis building blocks III and IV: asymmetrically substituted acyloins and acyloin derivatives, methods for their production and methods for the production of epothilones B, D and epothilone derivatives
申请人:——
公开号:US20040082651A1
公开(公告)日:2004-04-29
The present invention is directed to novel acyloins, their derivatives, methods for their production and their use for the production of novel epothilones and their derivatives. In addition, the invention is directed to the building blocks for epothilone synthesis, methods for their production and the use of synthetic building blocks for the production of epothilones and their derivatives.