Which of the four structures is consistent with the 1H-NMR spectrum shown below? t, 2H 5 (a) (c) 4 ход ngx PPM 2 tg, 2 H elle (b) (d) s. 9H t, 3 H 0
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- Which of the following compounds is consistent with the ¹H NMR spectrum shown? NC 1H, d 2H, m 1H, s 8 7 6 5 (A) NC (B) 4 3 H, s 3 2 1 NC. (C) TMS 0 ppm NC (D)When the 1î-NMR spectrum of acetone, CH3COCH3, is recorded on an instrument operating at 200 MHz, a single sharp resonance at 2.1î is seen. (a) How many hertz downfield from TMS does the acetone resonance correspond to? (b) If the 1î-NMR spectrum of acetone were recorded at 500 MHz, what would the position of the absorption be in î units? (c) How many hertz downfield from TMS does this 500 MHz resonance correspond to?How could 1H NMR spectroscopy be used to distinguish betweencompounds X and Y?
- How could 1H NMR spectroscopy be used to distinguish among isomersA, B, and C?The 'H NMR spectrum of 1,2-dimethoxyethane (CH;OCH,CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfield from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downeld from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
- Treatment of 2-methylpropanenitrile [(CH3)2CHCN] withCH3CH2CH2MgBr, followed by aqueous acid, affords compound V, whichhas molecular formula C7H14O. V has a strong absorption in its IRspectrum at 1713 cm−1, and gives the following 1H NMR data: 0.91(triplet, 3 H), 1.09 (doublet, 6 H), 1.6 (multiplet, 2 H), 2.43 (triplet, 2 H), and2.60 (septet, 1 H) ppm. What is the structure of V?(a) Draw all six isomers of formula C4H8 (including stereoisomers).(b) For each structure, show how many types of H would appear in the proton NMR spectrum.(c) For each structure, show how many types of C would appear in the 13C NMR spectrum.The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH32CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfield from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?