Concept explainers
(a)
Interpretation:
To draw the organic products formed when 4-octyne is treated with given reagent.
Concept introduction:
Reduction of an
(b)
Interpretation:
To draw the organic products formed when 4-octyne is treated with given reagent.
Concept introduction:
Reduction of an alkyne by the addition of H2 to one or both of the pi bonds. When an alkyne is treated with two or more equivalents of H2 and using the Pd catalyst, reduction of both the pi bonds occurs. Thus Palladium metal is too active a catalyst to allow the hydrogenation of an alkyne to stop after one equivalent of H2. Thus Lindlar catalyst is used to reduce the triple to double bond.
(c)
Interpretation:
To draw the organic products formed when 4-octyne is treated with given reagent.
Concept introduction:
Reduction of an alkyne by the addition of H2 to one or both of the pi bonds. When an alkyne is treated with two or more equivalents of H2 and using the Pd catalyst, reduction of both the pi bonds occurs. Using the Pd catalyst form the cis alkene or alkane product but not the trans alkene. Thus another reagent is used to reduce the triple to double in a trans form.
(d)
Interpretation:
To draw the organic products formed when 4-octyne is treated with given reagent.
Concept introduction:
Oxidative cleavage of an alkene breaks both the sigma and pi bonds of the double bond to form two carbonyl groups. Depending on the number of R groups bonded to the double bond, oxidative cleavage yields either
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