- Regioselective substitution reactions of zinc sulfolenylates
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Zinc sulfolenylates 2a-c have been generated by metal exchange processes from lithium sulfolenylate. These organozinc compounds show very interesting regioselectivity in the reactions with electrophiles.
- Chou, Ta-Shue,Tseng, Hsien-Jung
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- Synthesis and reactions of 2-SF5-butadiene
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A stable and storable precursor of 2-SF5-butadiene, 3-SF5-3-sulfolene, has been synthesized and its reactivity studied with several olefinic compounds. When SF5Br is added to sulfolene, 3-bromo-4-SF5-sulfolane i
- Winter, Rolf W.,Gard, Gary L.
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p. 896 - 901
(2008/03/14)
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- CHEMOSELECTIVE REACTIONS OF ULTRASONICALLY DISPERSED POTASSIUM WITH SOME BROMINATED HYDROTHIOPHENE S,S-DIOXIDES
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The reactions of ultrasonically dispersed potassium (UDP) with 4-bromo-2-sulfolenes resulted in chemoselective deprotonation at the C-5 position leading to the elimination-dimerization products.The possible C-S bond and C-Br cleavage reactions were not detected.The reaction of UDP with 3,4-dibromosulfolane resulted in dehydrobromination and double dehydrobromination.
- Chou, Ta-shue,Chen, Mei-Man
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p. 2829 - 2834
(2007/10/02)
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- NMR Spectroscopical Investigations of Thiophene 1,1-Dioxide and Related Compounds
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The 1H and 13C NMR data of thiophene 1,1-dioxide (3) and related compounds, especially of the precursor 2 and the consecutive product 5 are evaluated by computer simulation and multiple resonance.Chemical shifts and coupling constants reveal that 3 has the character of a cyclic diene.Diatropic or paratropic effects can be excluded. - Key words: 1H NMR Spectra, 13C NMR Spectra, Multiple Resonance, Thiophene 1,1-Dioxide
- Meier, Herbert,Molz, Thomas,Kolshorn, Heinz
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p. 915 - 920
(2007/10/02)
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- SELECTIVITY IN CYCLOADDITIONS-X. REGIOCHEMISTRY OF CYCLOADDITIONS OF NITRILE OXIDES TO THIOPHENE AND BENZOTHIOPHENE 1,1-DIOXIDES
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Thiophene-1,1-dioxide undergoes regioselective cycloaddition to benzonitrile oxide.In the reaction with the less reactive mesitonitrile oxide the sulfur dioxide deriving from the dimerization of the dipolarophile causes a catalytic decomposition of the ni
- Albini, F. Marinone,Ceva, P.,Mascherpa, A.,Albini, E.,Caramella, P.
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p. 3629 - 3639
(2007/10/02)
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