# Unsaturated ketone coupling pattern

Can someone explain to me the coupling pattern by proton $5$? Why is it triplet of quintet? Is it long range coupling?

I'm assuming that the proton $5$ couples to two other protons on carbon $4$. But what's next?

• Sure, it couples with two other protons on C4, hence the triplet. – Ivan Neretin Dec 2 '17 at 23:56
• It's a triplet of septuplets. It's hard to see, but you can see the seventh peak sticking out. – orthocresol Dec 2 '17 at 23:56