The stereoselectivity of the Wittig reaction is due in part to the choice of bas

Question

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 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. ldentify each of the following structures as either a stabilized ylide or unstabilized ylide by dragging and dropping a label into the blue box underneath each structure. 2 3 4 R1

Explanation / Answer

1)stablised yeald : phelyl group is electrone withdrawing group

2)unstablised yeald : because there is not withdrawing group.

.3)stablised yeald {The ylides with electron withdrawing groups adjacent to the negatively charged carbon are more stable}

4)stablised yeald

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