Chemistry CHEM S-20ab Lecture Notes - Lecture 11: Williamson Ether Synthesis, Mass Spectrum, List Of Gasoline Additives

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fuchsiamole391

30 Apr 2018

School

Harvard University

Department

Chemistry

Course

Chemistry CHEM S-20ab

Professor

Logan McCarty

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Chemistry E-2a: Lecture 9 December 11, 2008

Spin-Spin Splitting: Why Does It Happen?

Reading: Section 13.4

Chemistry S-20ab

Week 3

1

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Chemistry E-2a: Lecture 9 December 11, 2008

Spin-Spin Splitting: More Than One Neighbor

Reading: Section 13.4

Chemistry S-20ab

Week 3

1

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Document Summary

Predict the nmr spectrum of the following molecule: Name: you have just synthesized a new compound, and the following spectroscopic data is obtained, from the mass spectrum, you deduce that the molecular formula is c10h12o, the infrared spectrum is: Name: you have just synthesized a new compound, and the following spectroscopic data is obtained, from the mass spectrum, you deduce that the molecular formula is c9h12o, the infrared spectrum is: wavenumbers (cm 1): Draw your best choice for the structure of this molecule in the box below. You have just synthesized a new compound, and the following spectroscopic data is obtained: from the mass spectrum, you deduce that the molecular formula is c10h12o, the infrared spectrum is: wavenumbers (cm 1): From the infrared spectrum, what functional groups are definitely present: From the infrared spectrum, what functional groups are definitely absent: the proton nmr spectrum is: Draw your best choice for the structure of this molecule in the space below:

Related Questions

NMR (nuclear magnetic resonance) Uses the same theory and technology as an MRI!

1-What is the source of energy in NMR?____________________________________ What happens to atoms in a molecule exposed to this energy?_______________________________

2-What are two atom types that can be observed by NMR?________________________

3-What units are used to measure the strength of the magnetic field used?____________________ More significantly for us, what units are used to indicate the frequency of radiation used for resonance?________________

(Our instrument downstairs (a picoSpin) is 45 MHz. At the MN NMR Center at the U, they have instruments ranging 500 â 900 MHz.)

4-What can be distinguished with NMR?______________________________________________________

5-What are the axes of an NMR spectrum?____________________________________________________

6-What are the four different features of a spectrum that can provide information?

7-The number of NMR signals in a spectrum is equal to what?___________________________________

8-The position of an NMR signal in a spectrum depends on the electronic environment surrounding a particular __________________________.

9-If a proton is attached to an electronegative atom, it absorbs (downfield or upfield).

10-Where in an NMR spectrum would we expect to see an aldehyde H? See Table 14.1 ________________

11-What information is given by the area under an NMR signal?____________________________________

12-What information about is given by spin-spin splitting?________________________________________

13-How many peaks are contained in an NMR signal that has been described as a triplet?_________________________ How many adjacent protons are splitting this signal?________________

Skipping to section 14.11â¦

14-What do the number of different signals in a ¹³C spectrum indicate? __________________________________

15-What is the range of chemical shifts in a ¹³C spectrum?______________________________________________

Post lab question reguarding bomb calorimetry:

Heat capacity for calorimeter: 10403.64 J/â¦C

Delta H TTCC: -6864.20 kJ/mol

Resonance energy benzene: 423.01 kJ/mol

ÎE = -7096.54kJ/mol

1. How does the bomb get sealed when it is charged with oxygen gas?

2. Why is 1 mL of water added to the bomb before the oxygen gas is added? Would one drop (0.05 mL) of water be satisfactory?

3. Is the mechanical energy of the stirrer included in the heat capacity of the calorimeter? Explain your reasoning.

4. How does the ignition system work to cause combustion? Why doesn't the circuit "short out" because of the water in the bucket?

5. What happens to the wire when it combusts? Write a chemical equation for the reaction that occurs.

6. Does the ÎH combustion you calculate correspond to the initial temperature, the final temperature, or some other temperature? Why?

7. The temperature immediately after a sample is combusted in the bomb can be as much as 1500ÎC or more. Why don't you use this temperature in any of the calculations?

8. Heats of combustion listed in the various texts and handbooks are standard heats of combustion. Your determination was not carried out under standard conditions. Will this have any effect as you compare your enthalpies with the literature values? Explain your reasoning. (See Noggle, Physical Chemistry, 2nd edition, Scott Forseman, 1989, p. 90)

9. Combine your experimentally determined ÎHÎ combustion value for TTCC with standard heats of formation from the literature for CO2(g) and H2O(Î¡) to determine the standard heat of formation of 1,5,9,-trans-,trans-,cis-cyclododecatriene.

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Chemistry CHEM S-20ab Lecture Notes - Lecture 11: Williamson Ether Synthesis, Mass Spectrum, List Of Gasoline Additives

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