Why is the peak at m/z = 170 significantly more intense than other fragmentation peaks in the mass spectrum of 4-phenylphenol?
Why is the peak at m/z = 170 significantly more intense than other fragmentation peaks in...
29. The mass spectrum of the compound shown below has significant fragmentation peaks at m/z 85, 58, 57, 43, and 42. which two of these peaks are due to α-cleavage, and which one of therm is due to a McLafferty rearrangement? 30. Draw the expected 'H NMR spectrum for PhC02CH(CH3)2. Show correct shifts, multiplicities, and # of H-atoms. Finally, indicate which diagnostic IR absorptions you would expect to see for this compound. 6 4 2 0 PPM IR absorbances:
The molecular weight of a compound is typically indicated by the heaviest peak on a mass spectrum, which i presumed to correspond to the molecular ion (M*). For smaller compounds, the heaviest peak tends to also be the most intense peak. The lighter peaks in the spectrum result from fragmentation of the molecule into smaller ions. Since peak intensity correlates to the relative stability of the ions produced, the peaks of the ionized fragments can be more intense than the...
2. Draw the structure of the cation responsible for the base
peak (m/z=58) in the mass spectrum of 3-aminopentane shown
below:
3. Below is given the mass spectrum of a simple alkane. What is
the chemical formula of the alkane? What is the name of the alkane?
Explain how you determined the exact structure of the alkane from
the observed fragments.
4. Below is a mass spectrum of an ester. Identify the ester.
Consider that the dominant fragmentation pathway involves...
Problem 12-8 Show the fragmentation that accounts for the cation at m / z 57 in the mass spectrum of 2- methylpentane. Explain why this ion is less abundant than those at m/z 71 and 43. Problem 12-10
List the corresponding fragmentation structures to the peaks
with the m/z value and type of fragmentation for
3-Nitrobenzaldehyde
Common Name: MS IUPAC Name: Zoom Out CAS No.: Solvent: BP: MP: 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 U. I. ... 0.00 20 60 100 120 140 160
parent ion at m/z 102 (M*), IR peaks at 1740 and 1150 cm 10. Propose a structure for a molecule whose mass spectrum shows which gave the following 'H NMR spectrum.) 6 1 septet 2 5 0 6 PPM 11. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 116 (M*) with at 1740 and 1150 cm1 which gave the following H NMR spectrum. base peak at m/z 43, IR peaks 6 1 2...
Compound Z, CaHie0. Deduce its structure. IR: significant peaks at 2962 and 1718 (intense) cm. Mass spectrum: a few of the significant peaks include 128, 103, 57 m/z H-NMR: S,3H's aH's t,2t's PPM 13C-NMR 220 200 180 160 140 120 PPM 100 80 60 40 20
1-phenylethanol mass fragmentation for the peaks
400 3000 العلللللدد 2000 1600 V (cm) 1200 800 0.0 104 Mass Spectrum 10.5 لللللللللللا % of base peak 77,78 [ 79 ] 107 M+= 122 CaH0 لللللللللله 40 - 80 200 240 280 120 160 m/e 13C NMR Spectrum (100.0 MHz, CDCI, solution) CH
Compound Z, C5H160. Deduce its structure. IR: significant peaks at 2962 and 1718 (intense) cm! 13 Mass spectrum: a few of the significant peaks include 128, W, 57 m/z. H-NMR: s, at's 2 H'S 5,34's th's PPM 13 C-NMR 3 signals 220 200 180 160 140 120 PPM 100 80 60 40 20 0
The mass spectrum of compound A shows molecular ion peak at m/z 88. The IR spectrum of this compound has a broad peak between 3200 and 3550 cm-1. The 1H NMR spectrum of A shows the following peaks: a triplet at d 0.9, a singlet at d 1.1, one more singlet at d 1.15, and a quartet at d 1.6. The area ratio of these peaks is 3:6:1:2. The 13C NMR contains 4 signals. In the space below, propose a...