N-benzyl-N-[(E)-2-phenylethenyl]trifluoromethanesulfonamide

Very low‐temperature dynamic 29Si NMR study of the conformational equilibrium of (1,1′‐phenyl‐1,1′‐silacyclohex‐1‐yl)disiloxane

“…Room temperature 1 H, 13 C, and 29 Si NMR spectra coincided with those reported in Shainyan et al [7] Lowtemperature 1 H and 13 C NMR spectra are reported in Shainyan et al [7] The low-temperature 29 Si NMR spectra…”

“…In continuation of our ongoing research on the conformational analysis of silacyclohexanes and sila(hetero) cyclohexanes, [3][4][5][6] we synthesized (1,1′-phenyl-1,1′silacyclohex-1-yl)disiloxane 1 [7] and examined its lowtemperature 1 H and 13 C NMR spectra; unfortunately, neither were informative as far as the conformational composition of compound 1 is concerned. Therefore, we estimated the relative energies of the three possible conformers ( Figure 1) theoretically at the M062X/6-311G(d,p) and MP2/6-311G(d,p) levels of theory and showed the ax-ax conformer to be the most stable and the eq-eq conformer the least stable one (cf.…”

Unsaturated Derivatives of Trifluoromethanesulfonamide

“…In view of the successful synthesis of compound 3 in Scheme , its N ‐benzyl analogue 6 was obtained for subsequent deprotection by hydrolysis, leading finally to N ‐styryltriflamide ( 7 ) with a free NH group as shown in Scheme . However, attempted deprotection of 6 by treatment with triflic acid in boiling acetonitrile gave, after column separation, the unreacted substrate 6 , benzyl alcohol, and the initial saturated compound 1 . The formation of BnOH is evidence of the removal of the benzyl protecting group but the unexpected recovery of compound 1 is indicative of hydrogenation of the intermediately formed target N ‐styryltriflamide ( 7 ).…”