Question

I need help determining the structures of the molecular ion (206), base peak (164), and one other prominent fragment of the following mass spectra. I'm specifically struggling on the parent ion, and how to know which electron is going to be knocked off to make it (and why). Please explain so I can learn. Thank you so much!

Eugenol Acetate Abundance 25000 20000 15000 10000 91.1 105.1 119.1 134.1 149.1 204.2 77.1 5000 189.2 55.1 100 120 140

Answer 1

As the compound is Eugenol acitate with molecular ion = 206 Base peak = 164 Fragmentation pattern: -