Maxim777

3) A major step in “proving” the “benzyne mechanism” was shown in 1953 by John D. Roberts in which isotopically-labeled chlorobenzene was exposed to potassium amide to give a mixture of labelled aniline products (for the full article, see DOI: 10.1021/ja01109a523, or there is an excerpt in Vollhardt-Schore in section 22-4). The product distribution showed that there are two different carbon-14 labelled centers in the product. Provide a mechanism for this transformation, taking care to sh...

2) Norbornadiene, bicyclo[2.2.1]hepta-2,5-diene, can react in a Diels-Alder reaction with cyclopentadienones to give the benzene derivative as shown. Provide the mechanism for the transformation. Be sure to include all intermediates, formal charges, and arrows that depict electron movement.

Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid: Mg(s) 2HCl(aq) → MgCl2(aq) H2(g) What is the volume, in liters, of H2 gas produced at 26 ∘C and 825 mmHg from the reaction of 48.0 g of Mg? Express your answer with the appropriate units.

A 124-mL bubble of hot gases at 207 ∘C and 1.72 atm escapes from an active volcano. What is the temperature, in ∘C, of the gas in the bubble outside the volcano if the new volume of the bubble is 134 mL and the pressure is 0.844 atm ? Express your answer using two significant figures.

3) Thе following 1H NMR was takеn of a brominatеd acеtanilidе product. How many brominеs havе bееn addеd to thе starting acеtanilidе starting matеrial

Bаlаncе thе rеаctiоn fоr thе cоmbustiоn оf hеptаnе: ?C7H16 ?О2 → ?CО2 ?H2О Еntеr thе fоur cоеfficiеnts in оrdеr, sеpаrаtеd by cоmmаs (е.g., 1,2,3,4), whеrе 1 indicаtеs thе аbsеncе оf а cоеfficiеnt

Below is a 1H NMR spectrum of isopentyl acetate. Assign all of the hydrogen signals of isopentyl acetate to the appropriate 1H NMR signals by writing the appropriate peak letter on the correct region of the template molecule shown. (10 points)

The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final pressure of the gas, assuming constant temperature?

3) A retro-aldol reaction takes place under the same reaction conditions as a typical aldol addition reaction as these additions reactions are under equilibrium. Using this knowledge to your advantage, provide the mechanism for the following transformation. Be sure to include all intermediates, formal charges, and arrows that depict electron movement.

The reverse process of ester formation is called ester hydrolysis, where an ester is reacted under acidic conditions using water as the active nucleophile. Provide the mechanism for the following ester hydrolysis. Be sure to include all intermediates, formal charges, and arrows that depict electron movement.