For the following transformation a) identify the starting material with correct stereochemistry and b) provide a complete reaction mechanism, including stereochemistry, to account for the product shown. 
Definitions:
Facial-Feedback Hypothesis
The idea that sensory feedback from our facial expressions can affect our mood and emotions, suggesting that smiling can make us feel happier.
Positive Feelings
encompass emotions and sentiments that are uplifting, joyous, or gratifying, contributing to an overall sense of well-being.
Facial Expressions
Visual cues expressed by the muscles in the face conveying emotions, social information, or reactions to stimuli.
Paul Ekman
A psychologist who is best known for his work on the facial expressions of emotion and their relation to our feelings.
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