Avatar 320 ft ir spectrophotometer

All air sensitive manipulations were carried out under a dry argon or nitrogen atmosphere. THF and CH₂Cl₂ were dried using a column solvent purification system. Analytical thin-layer chromatography was performed on SiO₂ (silica gel 60A 35–70 μm, Carlo Erba, Val de Reuil Cedex, France), and the spots were located with 1% aqueous KMnO₄. Chromatography refers to flash chromatography, and was carried out on SiO₂ (SDS silica gel 60 ACC, 35–75 mm, 230–240 mesh ASTM). Hydrogenations were carried out in a Parr 4560 high-pressure reactor. NMR spectra were recorded at 300 or 400 MHz (¹H) and 100.6 MHz (¹³C), and chemical shifts are reported in δ values downfield from TMS, or relative to residual chloroform (7.26 ppm, 77.0 ppm) as an internal standard (see Supplementary Materials). Data are reported in the following manner: chemical shift, multiplicity, coupling constant (J) in hertz (Hz), integrated intensity, and assignment (when possible). Assignments are given only when they are derived from definitive two-dimensional NMR experiments (g-HSQC-COSY). IR spectra were performed in an Avatar 320 FT-IR spectrophotometer (Thermo Nicolet, Madison, WI, USA) and only noteworthy IR absorptions (cm⁻¹) are listed. High resolution mass spectra (HMRS; LC/MSD TOF, Agilent Technologies, Santa Clara, CA, USA) were performed by Centres Científics i Tecnològics de la Universitat de Barcelona.

All air sensitive manipulations were carried out under a dry argon or nitrogen atmosphere. THF and CH₂Cl₂ were dried using a column solvent purification system. Analytical thin-layer chromatography was performed on SiO₂ (silica gel 60A 35–70 μm, Carlo Erba, Val de Reuil Cedex, France), and the spots were located with 1% aqueous KMnO₄. Chromatography refers to flash chromatography and was carried out on SiO₂ (SDS silica gel 60 ACC, 35–75 mm, 230-240 mesh ASTM). NMR spectra were recorded at 300 or 400 MHz (¹H) and 100.6 MHz (¹³C), and chemical shifts are reported in δ values downfield from TMS or relative to residual chloroform (7.26 ppm, 77.0 ppm) as an internal standard. Data are reported in the following manner: chemical shift, multiplicity, coupling constant (J) in hertz (Hz), integrated intensity, and assignment (when possible). Assignments and stereochemical determinations are given only when they are derived from definitive two-dimensional NMR experiments (HSQC-COSY). IR spectra were performed in an Avatar 320 FT-IR spectrophotometer (Thermo Nicolet, Madison, WI, USA) and only noteworthy IR absorptions (cm⁻¹) are listed. High resolution mass spectra (HMRS; LC/MSD TOF, Agilent Technologies, Santa Clara, CA, USA) were performed by Centres Científics i Tecnològics de la Universitat de Barcelona.