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diphenylacetylene synthesis

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polly:
When starting with 2-butene rather then stilbene, another product other then 2-butyne is the major product.  What is the product and why does it form preferentially?

(Please see attachment- hope you can read it- hard to draw on paint)

GCT:
Where's the attachment?  What exactly are the reactants

polly:
second attempt...please let me know if not able to read - thanks!

GCT:
I'll give you a hint.  Which hydrogen is more acidic, allylic or vinyl?

GCT:
Allylic is more acidic, the hydrogen at the end of the 2-butene due to resonance stabilization of the conjugate base.  Thus the triple bond will eventually form there; at the end of the molecule.

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