Problem 12-8 Show the fragmentation that accounts for the cation at m / z 57 in...
Problem 13.7 The base peak in the mass spectrum of 2,2,4-trimethylpentane [(CHa)3CCH2CHCH3)2l occurs at m/z 57. What ion is responsible for this peak and why is this ion the most abundant fragment?
zene, C6H6? 12-23 Propose structures for compounds that fit the following data: al A ketone with M+ 86 and fragments at m/z 71 and m/z 43 h An alcohol with M+ = 88 and fragments at m/z 73, m/z 70, and m/z = 59 12-24 2-Methylpentane (C6H14) has the mass spectrum shown. Which peak represents M+? Which is the base peak? Propose structures for frag- ment ions of m/z 71, 57, 43, and 29. Why does the base peak have...
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...
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:
Why is the peak at m/z = 170 significantly more intense than other fragmentation peaks in the mass spectrum of 4-phenylphenol?
Problem #2. Alkene Spectroscopy a) Draw in two of the major fragmentation products of the radical cation of this alkene in the boxes provided. Clearly indicate if each compound is a radical, a cation, or a radical cation. -4 m/z 125 m/z = 97 b) Briefly describe the diagnostic peaks for the alkene from part a) in the IR spectrum. Explain where you would look (which cm) and what you would see. Since we are focusing on diagnostic peaks here,...
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...
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is lost to generate the ion with m/z =71? What cation does the peak at m/z = 43 represent? What group does the spacing between each set of ions represent? Why is the peak at (M-15), corresponding to loss of -CH3 so small? Draw the structure of 2,4-dimethylpentane What is the structure of the ion responsible for m/z = 85? Relative Intensity What is the...
if you can explain to me step by step how to come up with the answer. C. (2 Points) which pair (G 1, m, or v/Coans one Part 2 (10 Points Total) The following questions are based on the electron impact (El) mass spectrumm of tert-butylcyclopentane (A). a. (4 Points) What is the integer value of m/z for the molecular ion (M*) of A ? b. (3 Points) The base peak (most abundant ion) in the mass spectrum corresponds to...
16. A hydrocarbon with a molecular weight of 100 Da (and expected molecular ion at 100 m 2) was analyzed by mass spectrometry and gave the spectra shown below. Based on the MS spectrum and considering possible fragmentation of the hydrocarbon, which of the molecules provided corresponds to this spectrum? 100- m/z = 57 Da Relative Intensity m/z = 85 Da Expected molecular ion (not observed) 10 20 30 40 tillo el origen los 50 60 70 80 90 100...