描述了新型亚硒酸盐与磺酸盐的制备和表征。它们可以通过简单地将磺酸添加到亚硒酸盐溶液中并除去溶剂来容易地制备。在大多数情况下,它们是无色的晶体固体,比母体亚硒酸盐稳定得多,可以进行全面表征和X射线晶体学分析。它们还可以有效地将硫化物氧化为亚砜,而不会发生过氧化,并且可以干净地再生硒化物。它们的结构已通过1 H NMR光谱和X射线晶体学证实。
Ozonation of various silanes and germanes produced the corresponding hydrotrioxides, R3SiOOOH and R3GeOOOH, which were characterized by 1H, 13C, 17O, and 29Si NMR, and by infrared spectroscopy in a two-pronged approach based on measured and calculated data. Ozone reacts with the E-H (E = Si, Ge) bond via a concerted 1,3-dipolar insertion mechanism, where, depending on the substituents and the environment
Mechanism of Formation of Hydrogen Trioxide (HOOOH) in the Ozonation of 1,2-Diphenylhydrazine and 1,2-Dimethylhydrazine: An Experimental and Theoretical Investigation
(HOOO(*)) radical is proposed for the ozonation of hydrazines (RNHNHR, R = H, Ph, Me) that involves the abstraction of the N-hydrogen atom by ozone to form a radical pair, RNNHR(*) (*)OOOH. The hydrotrioxyl radical can then either abstract the remaining N(H) hydrogen atom from the RNNHR(*) radical to form the corresponding diazene (RN=NR), or recombines with RNNHR(*) in a solvent cage to form the hydrotrioxide
Enthalpies of the formation and decomposition of hydrogen trioxide HOOOH in an aqueous solution
作者:A. V. Levanov、O. Ya. Isaikina、V. V. Lunin
DOI:10.1134/s0036024416110145
日期:2016.11
The enthalpies of the formation and decomposition of hydrogen trioxide are estimated from the heating curves of peroxide-radical condensates synthesized from gaseous O2 + H2 mixtures. Enthalpy of decomposition Н2О3(aq.) → Н2О(liq.) + О2(gas) is −31.2 ± 1.5 kcal/mol, and enthalpy of formation Δf H(H2O3, aq.) =–37.5 ± 1.6 kcal/mol. Both values correspond to the temperature range of 240–265 K.
根据由气态O 2 + H 2混合物合成的过氧化物-自由基缩合物的加热曲线估算三氧化氢的形成和分解焓。分解Н焓2 О 3(水溶液)→Н 2 О(LIQ。)+О 2(气体)是-31.2±1.5千卡/摩尔,和形成Δ的焓˚F ħ(H 2 ö 3,水溶液) = –37.5±1.6 kcal / mol。这两个值都对应于240–265 K的温度范围。
Process for the production of chiral hydroxy-.beta.-lactams and
申请人:The Research Foundation State University of New York
公开号:US05294737A1
公开(公告)日:1994-03-15
The reaction between a hydroxyacetic acid derivative bearing an oxygen protecting group and a chiral auxiliary group and an imine produces chiral .beta.-lactams. Hydrolysis of the chiral .beta.-lactams produces chiral amino acid analogs.
The aromatic amines (I), alkyl amines (II), bicyclic amines (III). ##STR1## cycloalkyl amines (IV), aromatic bicyclic amines (V), hydroquinone amines (VI), quinone amines (VII), amino-ethers (VIII) and bicyclic amino ethers (IX) are useful as pharmaceutical agents for treating a number of conditions including spinal trauma, mild and/or moderate to severe head injury, etc. Also disclosed is a method of treatment using the 3,4-dihydrobenzopyrans (XI).