31465-25-5Relevant articles and documents
13C NMR of Acyclic Sulphonated Compounds Including Some Fluorosulphonic Acids: a Chemical Shift Study
Canselier, J. P.,Boyer, J. L.,Castro, V.,Gard, G. L.,Mohtasham, J.,et al.
, p. 506 - 510 (1995)
A chemical shift analysis of the 13C NMR spectra of more than 50 acyclic sulphonic acids, alkali metal sulphonates and methyl ester was carried out.Chemical shift increment systems with n-alkenes as reference molecules were established for linear alkanesulphonates and alk-2-enesulphonates.Some short-chain fluorinated sulphonic acids were also studied, especially pentafluorothio derivatives.C-F spin-spin coupling constants were determined.Pauling electronegativity values for SO3H and SF5 groups were derived from α chemical shift increments. - Keywords: NMR; 13C NMR; chemical shift; sulphonated compounds; fluorosulphonic acids
1,4-butane sultone and synthesis process thereof
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Paragraph 0048; 0060; 0071; 0082; 0093; 0100, (2017/07/23)
1,4-butane sultone and a synthesis process thereof relate to the field of fine chemical engineering. The synthesis process comprises the steps: performing sulfonation on 3-butylene-1-alcohol or 3-butylene-1-chlorine serving as a raw material and a sulfonating agent under the oxidation-reduction of an initiator; performing acidification after the reaction is finished; performing lactonization by high vacuum dehydration cyclization and azeotropic dehydration cyclization; and finally refining to obtain a 1,4-butane sultone finished product. The synthesis process of the 1,4-butane sultone, provided by the invention, is easily available in raw materials, few in synthesis steps, high in yield, high in product purity and suitable for industrialized production. The invention also provides the 1,4-butane sultone which is prepared by the synthesis process and has high purity.
N-Nitroso Sultams: On the Direction of Approach of Nucleophiles to the Sulfonyl Group
White, Emil H.,Lim, Hyung M.
, p. 2162 - 2166 (2007/10/02)
The N-nitroso derivatives of propanesultam, butanesultam, and pentanesultam were synthesized along with N-nitropropanesultam and N-nitro-N-methylmethanesulfonamide.The decompositions of the N-nitroso sultams, wich increase in rate with increasing ring size, yield the corresponding sultones and also varying amounts of regenerated sultams.These reactions are discussed in terms of higher energy pathway involving approach of the nucleophile in a direction between of sulfonyl oxygens (on the O, O, N face) and a lower energy pathway involving the conformer which permits approach of the nucleophile trans to and colinear with one of the coordinate covalent oxygen atoms (on R, O, N face). The mechanisms of the decomposition of the N-nitro sulfonamides and the tosyloxy diimide N-oxides are also discussed.N-nitrosopropanesultam (and the butyl analoque) are potent inhibitors of proteinase α-chymotrypsin.
