Synthesis and structure of 1-alkynyl-1,2-benziodoxol-3(1H)-ones
摘要:
1-Alkynyl-1,2-benziodoxol-3(1H)-ones 3 were synthesized by the reaction of 1-alkynyltrimethylsilanes with 1-hydroxybenziodoxolone 4 in the presence of BF3.Et2O. The IR and NMR spectra of 3 and the X-ray structure of 1-(cyclohexylethynyl)benziodoxolone 3a are in good agreement with the cyclic benziodoxolone structure in solution as well as in the solid state. The A value of the substituted ethynyl group of 3a was determined to be 1.33 kcal/mol by the dynamic H-1 NMR.