A synthesis of a natural product (broussonin A) began with metalation and

Chapter 22, Problem 22.40

(choose chapter or problem)

A synthesis of a natural product (broussonin A) began with metalation and trimethylsilylation of compound 1 to give 2. Compound 2 was metalated and the resulting organolithium reagent treated with 3-(p-benzyloxy)propanal to give compound 3. Subsequent transformations of 3 gave broussonin A (C16H18O3). Which of the choices is most reasonable for compound 3?

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