Okay, going back to this topic again...
The NMR spectrum in my first post in this thread corresponds to the reaction pictured below. I know that in this reaction, an E1 mechanism produces both E and Z β-bromostyrene, while an E2 mechanism produces just the Z isomer of β-bromostyrene. Since the NMR spectrum has proton peaks corresponding to both isomers, it seems that the reaction proceeds through an E1 mechanism, but what really confuses me is that the reaction is occurring in a polar aprotic solvent (acetone) with a strong base (K2
is a strong base, isn't it???), so that definitely favors an E2 mechanism, correct?
Because of this confusion, I am struggling to figure out how to answer the following question on my lab report: Based on the NMR spectrum, is the stereochemistry of this reaction consistent with an E1 or an E2 mechanism?