Question

if the rearrangement of pinacol is successful, what changes would be seen in the ir spectrum for the product compared to the starting material?

Answer 1

1. The disappearance of an O-H band from the starting material

2. The addition of a C-O double bond band in the product

3. The disappearance of a C-O single bond band from the starting material

explanation: In the course of the pinacol rearrangement, the diol is rearranged into a ketone. The O-H and C-O single bonds from the starting material diol should disappear in this process. A new C-O double bond of the ketone should appear in the product.

The carbon of the ketone is now an sp2 carbon. However, no hydrogens are connected to it, so there should not be any sp2 C-H bands in the product.