34379-72-1Relevant academic research and scientific papers
Syntheses of 4H-thiopyran-4-one 1,1-dioxides as precursors to sulfone-containing analogues of tetracyanoquinodimethane
Rule,Detty,Kaeding,Sinicropi
, p. 1665 - 1673 (2007/10/02)
Synthetic routes to the unsubstituted 4H-thiopynan-4-one 1,1-dioxide (5a), 2,6-dialkyl-substituted, 2-aryl- or 2-heteroaryl-6-alkyl-substituted, 2,6-diaryl- or diheteroaryl-substituted, and 2-heteroaryl-6-aryl-substituted 4H-thiopyran-4-one 1,1-dioxides 5b-s are described. Sodium hydrosulfide hydrate in buffered aqueous alcohol can be used as a substitute for hydrogen sulfide gas for the introduction of sulfur to methyl acrylate, to 1,5-disubstituted-1,4-pentadien-3-ones 13, or to 1,5-disubstituted-1,4-pentadiyn-3-ones 17. The double dehydrogenation of 2,3,5,6-tetrahydrothiopyran-4-one 1,1-dioxides 13 with iodine-DMSO-sulfuric acid gives thiopyran-4-one 1,1-dioxides 5 in good yield and small amounts of 1,4-pentadien-3-ones 13. 2,3,5,6-Tetrahydrothiopyran-4-one 1,1-dioxide (9) and 5,6-dihydrothiopyran-4-one 1,1-dioxide (12), which lack aryl or heteroaryl substituents, give poor yields of 4H-thiopyran-4-one 1,1-dioxide (5a) with iodine-DMSO-sulfuric acid.
Oxygen-17 Nuclear Magnetic Resonance Spectroscopy of Organosulfur Compounds. 2. 17O NMR Lanthanide-Induced Shifts (LIS) of Diastereotopic Sulfonyl Oxygens in Substituted Six-Membered-Ring Sulfones
Powers, T. A.,Evans, S. A.,Pandiarajan, K.,Benny, J. C. N.
, p. 5589 - 5594 (2007/10/02)
The 17O NMR shifts of diastereotopic sulfonyl oxygens within a series of conformationally homogeneous six-membered-ring organosulfur compounds have been determined.Their lanthanide-induced shifts (LIS), resulting from competitive complexation with the eur
Stereochemical Effects in Oxidation of Some Substituted 1-Hetera-4-cyclohexanols by Bromine
Natarajan, K.,Jambulingam, M.,Selvaraj, K.,Nanjappan, P.,Ramalingam, K.
, p. 901 - 903 (2007/10/02)
The rates of bromine oxidation of a number of substituted 1-hetera-4-cyclohexanols in acetic acid-water (80:20, percentv/v) have been measured at 50 deg C and the differences in reaction rates are rationalised based on the substituent and conformational e
Dissociation Constants of the Cyanohydrins of Some Substituted Thian-4-ones
Nanjappan, Palaniappan,Satyamurthy, Nagichetti,Ramalingam, Kondareddiar
, p. 714 - 716 (2007/10/02)
The dissociation constants of cyanohydrins of some substituted thian-4-ones and thian-4-one 1,1-dioxides have been determined at 25 deg C in 80percent dioxan.The polymethyl thian-4-one cyanohydrins and r-2,t-6-diiphenyl-c-3-alkylthian-4-ones show increasing instability owing to the effect of axial crowding.
