Which of the following alkenes would yield an alkyne upon addition of Br2, followed by reaction with more than two molar equivalents of NaNH2?
Which of the following alkenes would yield an alkyne upon addition of Br2, followed by reaction...
Q 7.15: Which of the following dihalides would form an alkyne in the highest yield when treated with NaNH2? Br, Br Br Br
Which of the following alkenes will yield a meso dihalide when reacted with Br2/CCH at room temperature? A) B C) D E) Both B and D
10.54 (...) The addition of H-X alkenes has been shown to add predominately via syn-addition, as shown below. н Br H-Br Two chemists disagreed on whether or not syn-addition would happen on terminal alkenes as well. Suggest an experiment through which you could resolve this dispute. H HCI syn or anti? 10.56 (...) When alkynes are treated with water and bromide, a bromoketone is produced. Provide a plausible arrow pushing mechanism, which accounts for the formation of this product. z...
Electrophilic addition of bromine, Br2, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH2Cl2In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ioa so that a product...
Which of the following substrates can be used to produce an alkyne when the substrate is treated with at least 2 equivalents of NaNH2? Select the two that apply. ge
Which of the following statements correctly describes the general reactivity of alkynes? A) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile.B) The σ bonds of alkynes are higher in energy than the π bonds and are thusmore reactive. C) Unlike alkenes, alkynes fail to undergo electrophilic addition reactions. D) Alkynes are generally more reactive than alkenes. E) Alkynes react as electrophiles, whereas alkenes reacts as nucleophiles.
Which of the following addition reactions are anti additions (lead to trans products)? (a) Br2 addition to an alkene (b) Catalytic hydrogenation of an alkene. (c) HBr addition to an alkene (d) OsO4 addition to alkene (e) All of the above Which of the following addition reactions are stereospecific? (a) Cl2 addition to a disubstituted alkene (b) HBr addition to a trisubstituted alkene (c) Radical addition of Cl2 to CH4 (d) Oxidation of a trisubstituted alkenes by using 03, Zn...
Stereochemistry of Electrophilic Addition Reactions of Alkenes 4. Predict the product of the following reaction. Consider the stereochemistry of the product Br Br. cis-2-butene trans-2-butene + сна, CH2Cl2 5. Predict the product of the reaction. Is the product a terminal or internal alkyne? Br 1. Excess NaNH 2. H,O Br
Which of the following reaction conditions would be used for the following transformation? 1. Br2 1. HB/ROOR 2. NaOCH3 1. Bry/hv 2. NaOCHy 1. Br2 2. KOC(CH3)3 1. Bry/hv 2. KOC(CH3)3 2. 3 equiv NaNH2 3. H20 A B с D. E Ос B ОЕ
QUESTION 1 2 points Save Answer Which reagent would you react with an alkyne to produce an alkane? O H2 + Pd/C o Oz O H2 +Pd/CaCO3 O Li + NH3 QUESTION 2 2 points Save Answer Which reaction will not yield carbonyl groups? O alkenes + ozone O alkenes + KMnO4 acidic conditions O alkynes + KMnO4 O alkenes + KMnO4 basic conditions