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SOLVED:Sketch your predictions of the proton NMR spectra of the following compounds.

SOLVED:Sketch your predictions of the proton NMR spectra of the following compounds.

2021年6月8日

An unknown compound has the molecular formula C9 H11 Br. Its proton NMR spectrum shows the following absorptions: singlet, δ7.1, integral 4.4 cm singlet, δ2.3, integral 13.0 cm singlet, δ2.2, integral 6.7 cm Propose a structure for this compound. | Numerade

An unknown compound has the molecular formula C9 H11 Br. Its proton NMR spectrum shows the following absorptions: singlet, δ7.1, integral 4.4 cm singlet, δ2.3, integral 13.0 cm singlet, δ2.2, integral 6.7 cm Propose a structure for this compound. | Numerade

Diethyl malonate can be monoalkylated and dialkylated with bromoethane. The proton NMR spectra are provided for each of these alkylated products. Interpret each spectrum and assign an appropriate structure to each spectrum. | Numerade

Diethyl malonate can be monoalkylated and dialkylated with bromoethane. The proton NMR spectra are provided for each of these alkylated products. Interpret each spectrum and assign an appropriate structure to each spectrum. | Numerade

2022年3月17日

From the proton NMR spectrum in Figure 19-44, deduce the structure of this hydrocarbon. | Numerade

From the proton NMR spectrum in Figure 19-44, deduce the structure of this hydrocarbon. | Numerade

2020年5月15日

The proton NMR spectrum for a compound with formula C9H8O is shown below. The normal carbon-13 NMR spectrum has five peaks. The infrared spectrum has a strong band at 1746 cm?1 . The DEPT-135 and DEPT-90 spectral results are tabulated. Draw the structure of this compound. Normal Carbon DEPT-135 DEPT-90 44 ppm Negative No peak 125 Positive Positive 127 Positive Positive 138 No peak No peak 215 No peak No peak | Numerade

The proton NMR spectrum for a compound with formula C9H8O is shown below. The normal carbon-13 NMR spectrum has five peaks. The infrared spectrum has a strong band at 1746 cm?1 . The DEPT-135 and DEPT-90 spectral results are tabulated. Draw the structure of this compound. Normal Carbon DEPT-135 DEPT-90 44 ppm Negative No peak 125 Positive Positive 127 Positive Positive 138 No peak No peak 215 No peak No peak | Numerade

2022年2月12日

The following proton NMR spectrum is of a compound of molecular formula C3 H8 O. (a) Propose a structure for this compound. (b) Assign peaks to show which protons give rise to which signals in the spectrum. | Numerade

The following proton NMR spectrum is of a compound of molecular formula C3 H8 O. (a) Propose a structure for this compound. (b) Assign peaks to show which protons give rise to which signals in the spectrum. | Numerade

2021年6月10日

SOLVED:Predict the appearance of the high-resolution proton NMR… | Numerade

SOLVED:Predict the appearance of the high-resolution proton NMR… | Numerade

2020年5月15日

The proton NMR spectrum for a compound with formula C8H18 shows only one peak at 0.86 ppm. The carbon-13 NMR spectrum has two peaks, a large one at 26 ppm and a small one at 35 ppm. Draw the structure of this compound. | Numerade

2022年2月12日

SOLVED:The proton NMR spectrum is shown for a compound with formula… | Numerade

2022年3月17日

The partial proton NMR spectra (A and 𝐁 ) are given for the cis and trans isomers of the compound shown below (the bands for the three phenyl groups are not shown in either NMR). Draw the structures for each of the isomers and use the magnitude of the coupling constants to assign a structure to each spectrum. It may be helpful to use a molecular modeling program to determine the dihedral angles for each compound. The finely spaced doublet at 3.68 ppm in spectrum A is the band for the O-H peak.

The proton NMR spectral information shown in this problem is for a compound with formula C9H8F4O. Expansions are shown for all of the protons. The aromatic ring is disubstituted. In the region from 7.10 to 6.95 ppm, there are two doublets (1H each). One of the doublets is partially overlapped with a singlet (1H). The interesting part of the spectrum is the one proton pattern found in the region from 6.05 to 5.68 ppm. Draw the structure of the compound and draw a tree diagram for the proton at 5.

2022年3月17日

SOLVED:The proton NMR spectrum shown in this problem is of trans-2-pentenal. Expansions are shown for each of the five unique types of protons in this compound. Determine the coupling constants. Draw tree diagrams for each of the protons shown in the expansions and label them with the appropriate coupling constants. Also determine which of the coupling constants are 3 J and which are 4 J. Assign the protons to the structure using the letters a, b, c, d, and e. Hertz values are shown above each o

2022年3月17日

SOLVED:How many signals would you expect to see in the 'H NMR spectrum of each of the five compounds with molecular formula C6 H14 ?

2020年5月28日

It turns out that a proton chemical shift of 2.2 ppm corresponds to a frequency range of 1100 Hz on a certain NMR instrument. Determine the magnetic field strength of this instrument. | Numerade

2020年6月12日

SOLVED:How could you distinguish the 'H NMR spectra of the… | Numerade

10 个月之前

a. Calculate the magnetic field (in tesla) required to flip an ^1 H nucleus in an NMR spectrometer that operates at 360 MHz b. What strength magnetic field is required when a 500-MHz instrument is used for ^1 H NMR? | Numerade

10 个月之前

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