Thermal Reactions of Regioisomeric 1,2,4-Trithiolane<i>S</i>-Oxides
作者:Grzegorz Mloston、Jaroslaw Romanski、Michael L. McKee、Hans Peter Reisenauer、Peter R. Schreiner
DOI:10.1002/ejoc.200901440
日期:2010.4
The products of the gas-phase pyrolysis of two regioisomeric 1,2,4-trithiolane S-oxides were collected in an argon matrix at 10 K and studied by means of spectroscopic as well as computational methods. Whereas the main products of the pyrolysis of the "symmetrical" S-oxide were identified as thioformaldehyde S-oxide and thioformaldehyde S-sulfide, the "non-symmetrical" S-oxide gave predominantly dithioformic
在 10 K 的氩气基质中收集两种区域异构 1,2,4-三硫戊环 S 氧化物的气相热解产物,并通过光谱和计算方法进行研究。“对称”S-氧化物热解的主要产物被鉴定为硫代甲醛S-氧化物和硫代甲醛S-硫化物,而“非对称”S-氧化物主要产生二硫代甲酸,其以s-的混合物形式存在。顺式和 s-反式构象异构体。我们提出了反应途径的合理化,包括密度泛函理论计算。
ThioformaldehydeS-sulfide (Thiosulfine)
作者:Grzegorz Mlostoń、Jaroslaw Romański、Hans Peter Reisenauer、Günther Maier
Matrix isolation spectroscopy allows the direct identification of ylide 1 and its cyclic isomer 2. They were obtained by pyrolysis of 1,2,4-trithiolane under high vacuum; the cyclic compound forms from 1 by thermalring closure in a kinetically controlled reaction.
Photochemical Formation and Reactivities of Substituted Oxathiiranes in Low-Temperature Argon Matrices
作者:Hans Peter Reisenauer、Grzegorz Mloston、Jaroslaw Romanski、Peter R. Schreiner
DOI:10.1002/ejoc.201100695
日期:2011.11
thioketones were irradiated in argon matrices at 10 K, and the resulting oxathiiranes were identified by comparison of computed and experimental IR spectra. Upon photolysis at 10 K, depending on the substitution pattern, the oxathiiranes underwent either H-shift reactions or regioselective ring enlargements to form the corresponding thioesters. After warming of the matrix material to 38–40 K, the oxathiiranes
衍生自脂肪族和脂环族硫酮的硫代羰基 S-氧化物(亚砜)在 10 K 的氩基质中进行辐照,并通过计算和实验红外光谱的比较来鉴定所得氧硫杂环丙烷。在 10 K 光解后,根据取代模式,氧杂环丙烷经历 H 位移反应或区域选择性环扩大以形成相应的硫酯。将基体材料加热到 38-40 K 后,氧杂环丙烷进行快速脱硫以产生相应的酮。B3LYP/6-311+G(3df,3pd) 水平的密度泛函理论 (DFT) 计算表明氧硫杂环丁烷的脱硫作为双分子过程发生,活化焓接近 0 kcal mol–1。
DE675881
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2-methyl-4-amino-5-thioformyl-aminomethylpyrimidine and process for the manufacture of amides of thioformic acid