In the Wittig reaction, the cyclic gxaphosphetane intermediate (shown below) undergoes fragmentation to produce an olefin and a phosphine oxide. Hypothetically, two possible arrow pushing mechanisms can be proposed but only one is correct. Please select one (mechanism 1 or mechanism 2) and explain why it is correct. If you believe both are correct, also explain why. Ph Ph. Ph Ph Ph Ph mechanism 1 mechanism 2 Ph Ph Ph

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In the Wittig reaction, the cyclic gxaphosphetane intermediate (shown below)
undergoes fragmentation to produce an olefin and a phosphine oxide. Hypothetically,
two possible arrow pushing mechanisms can be proposed but only one is correct.
Please select one (mechanism 1 or mechanism 2) and explain why it is correct. If you
believe both are correct, also explain why.
Ph
Ph.
Ph
Ph
Ph
Ph
mechanism 1
mechanism 2
Ph
+
Ph
Ph
Transcribed Image Text:In the Wittig reaction, the cyclic gxaphosphetane intermediate (shown below) undergoes fragmentation to produce an olefin and a phosphine oxide. Hypothetically, two possible arrow pushing mechanisms can be proposed but only one is correct. Please select one (mechanism 1 or mechanism 2) and explain why it is correct. If you believe both are correct, also explain why. Ph Ph. Ph Ph Ph Ph mechanism 1 mechanism 2 Ph + Ph Ph
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