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The first 2 steps create the core carbon chain using alkyne anions
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Then HBr is added to the triple bond to create 2 anti-addition products
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A methyl group replaces bromine using Grinard.
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NBS causes radical substitution at allylic position, and bromine's
high selectivity makes secondary substitution favorable (p. 337).
This creates 2 different major products.
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Finally, -OH subsitutes bromine.
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