Consider the reaction sequence given in Fig. p9.70. (Bu- - butyl group : CH3CH2CH2CH2 .)
(a) Use what you know about the stereochemistry of bromine addition to propose the stereochemistry of compound B.
(b) Is the B †’ Q reaction a syn- or an anti- elimination? Show your analysis.
(c) How would the stereochemistry of products change if the (E)-stereoisomer of compound A were carried through the same sequence of reactions? Explain.

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Li Si(CH)s Bu Ll Bu-CH-CH-Si(CH)s CH,O Br Br 3r Figure P9.70