Experiment 9

For a diels-alder reaction between anthracene and maleic anhydride, are the exo and endo forms of product 9,10-dihydroanthracene-9,10-ɑ,β-succinic acid anhydride different stereoisomers or are they the same molecule?

Please answer both parts to the questions completely. I will rate the answer afterwards. For a diels-alder reaction between anthracene and maleic anhydride, are the exo and endo forms of product 9,10-dihydroanthracene-9,10-ɑ,β-succinic acid anhydride different stereoisomers or are they the same molecule? Explain your answer by drawing the molecule. Would it be favorable to get a 1,4-adduct of anthracene and maleic anhydride? Why or why not? If the 1,4-adduct of anthracene and maleic anhydride had formed, would it have different exo and endo isomers? Yes or no and why?

Can I get this question answered with an explanation   Why is it better to acquire the 1H-NMR spectrum in DMSO-d6 and not in CDCl3?

A Diels–Alder reaction calls for the use of 5.8 mL5.8 mL of a 4.0 M solution of cyclopentadiene in methanol. Calculate the number of moles of cyclopentadiene present in this volume.

When 2-chlorohexane is treated with sodium ethoxide (NaOCH2CH3), the major product for the reaction is 2-hexene. Explain how mass spectrometry and IR spectroscopy could be used to prove that the reaction has occurred and you no longer have 2-chlorohexane. 28.

Why 9(t-butyl) anthracence has a lower quantum yield than 9-methyl anthracence?

3-Sulfolene: A butadiene Source for a diels Alder Synthesis. Please be prepared to take a quiz on this experiment. Be able to write an equation for this reaction. What intermediate is formed. What solvent is used. What is boiling point of the solvent? The authors state that by using solvent they were able to control decomposition of 3-sulfolene in 25- 30 minutes. Why is that important?

Show the starting diene and dienophile you could use to prepare the following molecule: Diene Dienophile H

When 1-bromobutane is treated with sodium acetate (CH3CO,Na), the major product for the reaction is an ester (CH;CO2CH2CH2CH2CH3). Explain how mass spectrometry and IR spectroscopy could be used to prove that the reaction has occurred and you no longer have the starting material.

Label the infrared spectroscopy (IR) graphs based on the marked wavenumbers on the chart for tetraphenylcyclopentadienone (adol condensation with benzil and dibenzyl ketone) and tetraphenylhydrophathalic anhydride (by diels-alder reaction of previous product and maleic anhydride). Explain the differences between the two charts and determine if the experimental reactions were done successfully by comparing the experimental IR results shown with what you would expect the IR results to be. Attached is chart 1, chart 2, and respective reaction 1, reaction 2.

4. The success of each reaction in a Radical Fluorination of an Ibuprofen Derivative is determined by calculating an NMR yield. To do this, one will add 1 equivalent (0.15 mmol) of an internal standard, dibromomethane (CH2B12), to each reaction mixture when one prepare the NMR samples. Look up the molecular weight of dibromoethane and calculate how many mg of dibromomethane one will need to add to each reaction. (Convert 0.15 mmol of dibromometbane to mg.)

How would you interpret this IR spectra of fluorene? What I mean by this is which peaks let you know its fluorene and which peaks show impurities if any such as 9-fluorenone since this lab required a separation of fluorene and 9-fluorenone. Other impurities could be solid alumina and sand and the solvents of pet. ether and dichlormethane.

3. please answer this

A Diels–Alder reaction calls for the use of 5.7 mL5.7 mL of a 4.0 M solution of cyclopentadiene in methanol. Calculate the number of moles of cyclopentadiene present in this volume.   number of moles of cyclopentadiene:                                         mol

given the IR spectrum and structure of the endo product of a Diels-Alder reaction, specify the functional groups associated with the peaks shown

Relative Intensity Part VI. consider the multi-step reaction below for compounds A, B, and C. These compounds were subjected to mass spectrometric analysis and the following spectra for A, B, and C was obtained. Draw the structure of B and C and match all three compounds to the correct spectra. Relative Intensity Relative Intensity 20 NaоH 0103 Br (B) H2504 → (c) (A) 100- MS-NU-0547 80 40 20 31 10 20 100- MS2016-05353CM 80 60 100 MS-NJ-09-3 80 60 40 20 45 J.L 80 S1 84 M+ absent राग 135 137 S2 62 164 166 11 S3 25 50 75 100 125 150 175 m/z

this is the spectral data for 4-cyclohexene-cis-1,2-dicarboxylic acid - Write the 1H NMR spectral information in ACS format

Interpret the NMR results in terms of purity. What should a chemist do to improve the yield or purity of the product?     Discuss the key parts of the NMR for the starting material and pure product.  Focus on the peaks that show up after 3 ppm.  For the starting material, discuss what those 2 peaks (around 3.5 ppm and 4.7 ppm) correspond to in the structure of cyclohexanol.  For the pure product, discuss why those 2 peaks are missing, and there is a new peak for 2H at around 5.6 ppm.  Then, discuss the NMR for your actual product from the reaction.  Does it contain pure product?  If not, what else is there?  How do you know this based on the NMR? Based on your understanding of the reaction and LeChatelier’s principle, how can you improve the reaction yield?  How can you better purify the reaction product?

The UV-spectrum of cyclohexanone shows absorption maxima at 189 nm and What type of transition is responsible for each of these bands? How will these absorptions change while the polarity of an added (af 279 nm. changing solvent?

Explain why butadiene sulfone was used in the Diels-Alder reaction with maleic anhydride? Why is excess employed in the reaction?

Which spectroscopic tool would be best for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane?  NMR spectroscopy IR spectroscopy UV/vis spectroscopy  Mass Spectrometry

a. An oxygen-containing compound shows an absorption band at ~1700 cm-1 and no absorption bands at ~3300 cm-1, ~2700 cm-1, or ~1100 cm-1. What class of compound is it? b. A nitrogen-containing compound shows no absorption band at ~3400 cm-1 and no absorption bands between ~1700 cm-1 and ~1600 cm-1 or between 2260 cm-1 and 2220 cm-1. What class of compound is it?