The stereoselectivity of the Wittig reaction is due in part to the choice of base and steric effects, but is largely controlled by electronic effects. Stabilized ylides tend to form the E isomer of the alkene product, whereas unstabilized ylides tend to form the Z isomer as the major product. In order to stabilize an ylide, the carbanion carbon is bonded to an electron withdrawing group, such as a carbonyl. Identify each of the given structures as either a stabilized ylide or unstabilized ylide by dragging and dropping a label into the blue box underneath each structure.
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Chemistry, 22.06.2019 06:40
Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.
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Chemistry, 22.06.2019 19:00
Which change to the system wood cause the freely-moving piston to lower?
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The stereoselectivity of the Wittig reaction is due in part to the choice of base and steric effects...
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