double bond

This is attracted to and reacts with the double bond in the same way as before.

They're very similar except that one has an extra double bond.

Suppose such a double bond exists between positions 5 and 6.

It is possible to effect reaction at one of the double bonds selectively.

It is certainly not impossible to twist a double bond.

Heat can cause the double bonds to form a ring.

Light can also cause the double bonds to form a ring.

A trans double bond in the ring would be too strained.

Now we can answer the question: what makes the double bond.

Then one of the oxygen is negatively charged, and the other has a double bond.