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I) A' ecrtain rdio frequency . 12.8 /s, what is its 45" () pulae field strength B,, if the'H 902 pulse Iength pulse Icngth? ii) Assuming we measured ...

Question

I) A' ecrtain rdio frequency . 12.8 /s, what is its 45" () pulae field strength B,, if the'H 902 pulse Iength pulse Icngth? ii) Assuming we measured 'H 90" strength Bia If we pulse Iength 128 MS at certiin r f pulcc field field strength. decrease the pulse strength B, only half of the original pulec what is the 90" pulse length now? In lab We mcasured 'H NMR CH CHCHCH,OH spectnum and Ti rclaxations for [-butanol sample, Use the spectra t0 answer the following q

i) A' ecrtain rdio frequency . 12.8 /s, what is its 45" () pulae field strength B,, if the'H 902 pulse Iength pulse Icngth? ii) Assuming we measured 'H 90" strength Bia If we pulse Iength 128 MS at certiin r f pulcc field field strength. decrease the pulse strength B, only half of the original pulec what is the 90" pulse length now? In lab We mcasured 'H NMR CH CHCHCH,OH spectnum and Ti rclaxations for [-butanol sample, Use the spectra t0 answer the following questions. (25 points) i) List the chemical shifts of 'H at these sites: CH;: ppm; CHz (): Ppm; CHz (b): Ppm; CHz (c): ppm: OH: ppm- ii) From the fine structure i.e: pcak splitting the J-coupling of 'H at CHs or CHz sites can be determined as about Ppm and Hz iii) At which site; there is the strongest 'H nuclear shielding 02 At which site there is the weakest 'H nuclear shielding 0? (a) CH, site CHz (a) site (c) CHz (b) site (d) CHz (c) site (e) OH site



Answers

(a) Account for the fact that the $^{1} \mathrm{H}$ NMR spectrum of benzene contains a singlet at 8 7.2 ppm, but the spectrum of buta-1,3-diene shows lower frequency multiplets $(\delta ~ 5.0,5.1$ and $6.3 \mathrm{ppm}$ ). (b) An aromatic compound A shows a parent ion in its mass spectrum at $m / z=104 .$ The results of an elemental analysis are: $\mathrm{C}, 92.3 \% ; \mathrm{H}$ $7.7 \% .$ Compound A reacts readily with $\mathrm{Br}_{2}$ to give an addition product, B. The $^{13}$ C NMR spectrum of A exhibits signals at $\delta 137.6,137.0$ 128.5,127.8,126.2 and $113.7 \mathrm{ppm.}$ In the $600 \mathrm{MHz}^{1} \mathrm{H}$ NMR spectrum, overlapping signals appear in the range $\delta 7.5-7.1 \mathrm{ppm},$ and there are three doublets of doublets at $\delta 6.7$ $(J 18 \mathrm{Hz}, 11 \mathrm{Hz}), 5.7(J 18 \mathrm{Hz}, 2 \mathrm{Hz})$ and $5.2(J 11 \mathrm{Hz}, 2 \mathrm{Hz}) \mathrm{ppm} .$ Suggest identities for $\mathbf{A}$ and $\mathbf{B}$

Yeah. Okay. When trying to convert into girls into an actual ratio of hydrogen and you don't know what the structure is. The simplest ways to divide all of the integral is by the smallest integral value. So if the three integral Zar 64 and 18.4, We divide all three of those by four, Which would give us a ratio of 1.5 to 1- 4.6. Now we can't have half a hydrogen. So the next thing is to find a multiple that will turn all of the numbers into very close to integer values or whole number values. So in this case we can multiply all of them by two, which gives us a ratio of 3-2-9, Technically 9.2. But that would ran down to nine. So a structure that would have those into girls without knowing anything about shifts or splitting. We could have a metal bonded to an oxygen bonded to a methylene S. H. Two groups bonded to a carbon with three equivalent metals attached to it, or a T. Beautiful group. There are other structures, of course, that are possible, and information about splitting or shifts could change the answer, but this structure is one that fits the given criteria.


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