NMR spectroscopic experiments were carried out, either on Varian MERCURY 300 MHz (300 and 75 MHz for 1H and 13C, respectively) or Bruker Avance I 400 MHz spectrometers (400 and 101 MHz for 1H and 13C, respectively). Chemical shifts (δ) are given in ppm relative to the CHCl3 internal standard, and the coupling constants J are reported in Hertz (Hz). Mass spectra were recorded on an LCQESI MS, on a LCQ Advantage spectrometer from Thermo Finningan, and a LCQ Fleet spectrometer from Thermo Scientific. Optical rotations were measured on a PerkinElmer 343 polarimeter (concentration in g/100 mL). Diazoalkanes 1a –c , maleimides 2a,b, and protected amino acids are commercially available compounds.
Avance 1 400 mhz spectrometers
Manufactured by Bruker
The Avance I 400 MHz spectrometers are NMR (Nuclear Magnetic Resonance) instruments manufactured by Bruker. They operate at a magnetic field strength of 400 MHz and are designed for high-resolution nuclear magnetic resonance spectroscopy.
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2 protocols using avance 1 400 mhz spectrometers
1
NMR and Mass Spectroscopic Characterization
2
NMR, MS, and Optical Rotation Analysis
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NMR spectroscopic experiments were
carried out either on Varian MERCURY 300 MHz (300 and 75 MHz for 1H and 13C, respectively) or Bruker Avance I 400
MHz spectrometers (400 and 101 MHz for 1H and 13C, respectively). Chemical shifts (δ) are given in ppm relative
to the CHCl3 internal standard, and the coupling constants J are reported in Hertz (Hz). Mass spectra were recorded
on an LCQESI MS and on a LCQ Advantage spectrometer from Thermo Finningan
and a LCQ Fleet spectrometer from Thermo Scientific. Optical rotations
were measured on a PerkinElmer 343 polarimeter (concentration in g/100
mL). Diazoalkanes1a –c and maleimides 2a –c are commercially available compounds.
carried out either on Varian MERCURY 300 MHz (300 and 75 MHz for 1H and 13C, respectively) or Bruker Avance I 400
MHz spectrometers (400 and 101 MHz for 1H and 13C, respectively). Chemical shifts (δ) are given in ppm relative
to the CHCl3 internal standard, and the coupling constants J are reported in Hertz (Hz). Mass spectra were recorded
on an LCQESI MS and on a LCQ Advantage spectrometer from Thermo Finningan
and a LCQ Fleet spectrometer from Thermo Scientific. Optical rotations
were measured on a PerkinElmer 343 polarimeter (concentration in g/100
mL). Diazoalkanes
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