The determination of sulfoxide configuration in six-membered rings using NMR spectroscopy and DFT calculations
摘要:
Cyclic six-membered ring sulfoxides and sulfones were prepared by a stepwise in situ oxidation of the corresponding sulfides with meta-chloroperbenzoic acid in an NMR tube. The oxidation was followed by NMR spectra and the H-1 and C-13 NMR data were collected. The geometries of all of the compounds were optimized using the DFT B3LYP/6-31G** method and the C-13 and H-1 NMR chemical shifts were calculated for geometry-optimized structures with the DFT B3LYP/6-31++G** method. The calculated C-13 NMR chemical shifts induced by oxidation (Delta delta values) are in very good agreement with the experimental data and can be used to determine the oxidation state of the sulfur atom (-S-, -SO-, -SO2-). The characteristic differences of the induced oxidation chemical shifts of carbon atoms at the alpha- and beta-position to sulfur were successfully used for distinguishing between the diastereoisomeric sulfoxides. (C) 2011 Elsevier Ltd. All rights reserved.
Sulfur Compounds in Kerosine Boiling Range of Middle East Crudes
作者:S. F. Birch、T. V. Cullum、R. A. Dean、R. L. Denyer
DOI:10.1021/ie50542a027
日期:1955.2
RESIN AND RESIST COMPOSITION
申请人:Ichikawa Koji
公开号:US20100323296A1
公开(公告)日:2010-12-23
A resin comprises a structural unit derived from a compound represented by the formula (aa)
wherein T represents a C
4
to C
36
alicyclic hydrocarbon group, the hydrogen atom contained in the alicyclic hydrocarbon group may be replaced by a halogen atom, a hydroxyl group, a C
1
to C
12
alkyl group optionally substituted with a halogen atom or a hydroxyl group, a C
1
to C
12
alkoxyl group, a C
6
to C
12
aryl group, a C
7
to C
12
aralkyl group, a glycidyloxy group, a C
2
to C
4
acyl group, an alkoxycarbonyl group, an alkanoyloxyalkyl group or a cyano group, and the —CH
2
— contained in the alicyclic hydrocarbon group is replaced by at least one —SO
2
— and furthermore may be replaced by —CO—, —O—, —S—, —SO
2
— or —N(R
c
)—; R
c
represents a hydrogen atom or a C
1
to C
6
alkyl group; R
1
represents a hydrogen atom, a halogen atom, or a C
1
to C
6
alkyl group that may optionally has halogen atoms; and Z
1
represents an optionally substituted C
1
to C
17
saturated hydrocarbon group, and the —CH
2
— contained in the saturated hydrocarbon group may be replaced by —CO—, —O—, —S— or —N(R
c
)—.