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。
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。
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。
Matrix isolation and spectroscopic properties of the methylsulfinyl radical CH3(O)S˙
作者:Hans Peter Reisenauer、Jarosław Romański、Grzegorz Mlostoń、Peter R. Schreiner
DOI:10.1039/c3cc45379k
日期:——
The atmospherically highly relevant methylsulfinyl radical CH3(O)S was generated thermally under flash pyrolysis conditions and isolated in Ar matrices at 10 K; the allyl radical is a byproduct. CH3(O)S and its D3- and (13)C-isotopologues were characterized through the excellent agreement between experimental and computed IR and UV/Vis spectra.
作者:Peter R. Schreiner、Hans Peter Reisenauer、Jaroslaw Romanski、Grzegorz Mloston
DOI:10.1021/ja100670q
日期:2010.6.2
less stable than sulfine, in marked contrast to the isomer energy difference of dioxirane vs carbonyloxide (ca. -25 kcal mol(-1)). This is due to the strong positive polarization (blue potential) versus the highly electronegative oxygen atom (red). The stability ordering and the relative energy differences of carbonyl versus thiocarbonyl groups underline the likely role oxathiiranes play in sulfur
The rotation-vibration bands of a transient molecule, sulfine, (methanethial S-oxide), have been observed by FT-IR and analyzed with the aid of microwave data, a part of which has been newly obtained in this study. The band center frequencies for ν5 and ν9 are determined to be 1175.75 cm−1 and 762.07 cm−1, respectively. The good agreement between the observed and simulated band contours clarifies that the origin of these bands is sulfine.
作者:Peter R. Schreiner、Hans Peter Reisenauer、Jaroslaw Romanski、Grzegorz Mloston
DOI:10.1002/anie.200903969
日期:2009.10.12
Extremely rare: A CS triplebond can be assigned to HCSOH, a new molecule prepared from H2CSO by a photochemical [1,3]H‐shift. But does this formal description agree with analyses on the basis of IR vibrations, bond lengths, bond orders, molecular orbitals, and compliance constants? Molecules like this challenge and refine our current understanding of chemical bonding.