1. In step one, an electron adds to the alkyne at the carbon labeled ____ . 2. I
ID: 820087 • Letter: 1
Question
1. In step one, an electron adds to the alkyne at the carbon labeled ____.
2. In step one, if an electron adds to the alkyne at the carbon atom labeled two, then either electrons from the triple bond are transferred heterolytically to the carbon atom(s) labeled ____ or electrons from the triple bond are transferred homolytically to the carbon atom(s) labeled ____.
3. At the end of step one, a ____ is produced.
4. In step two, the intermediate from step one is protonated. If the radical carbon atom is located at carbon atom is located at carbon two, then the protonation will occur at carbon ____.
5. At the end of step two, a ____ and an amide ion are produced.
6. In step three, an electron adds to the intermediate formed in step two. If the protonation occurred at carbon two in the second step, then the electron will add to carbon ____.
7. At the end of step three, a ____ is produced.
8. The methyl and 1-bromo-2-methyl-propyl groups will be orientated on the ____ of the double bond in the intermediates.
Choices:
4-bromo-5-methylhex-2-yne undergoes a metal-ammonia reduction to form an alkene product. Two hydrogen atoms add to the triple bond with the help of sodium metal in liquid ammonia. Draw the mechanism on your own, then identify the key components of the mechanism leading to the production of an alkene. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. In step one, an electron adds to the alkyne at the carbon labeled In step one, if an electron adds to the alkyne at the carbon atom labeled two, then either electrons from the triple bond are transferred heterolytically to the carbon atom(s) labeled ____ or electrons from the triple bond are transferred homolytically to the carbon atom(s) labeled At the end of step one, a ____ is produced. In step two, the intermediate from step one is protonated. If the radical carbon atom is located at carbon atom is located at carbon two, then the protonation will occur at carbon ____ At the end of step two, a ____ and an amide ion are produced. In step three, an electron adds to the intermediate formed in step two. If the protonation occurred at carbon two in the second step, then the electron will add to carbon ____ At the end of step three, a ____ is produced. The methyl and 1-bromo-2-methyl-propyl groups will be orientated on the ____ of the double bond in the intermediates. Both two and three ·Two ·Same side ·Three ·Opposite sides ·Four ·Either two or three ·Vinyl nion ·Radical anion ·Vinyl radical ·One ·Either one or fourExplanation / Answer
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