I am dealing with some basic reactions in organic chemistry. One of these is the acid reflux of alcohols. Something I came across was hydride shifts. I know how and why they occur, but I don't understand why they are called 1,2 hydride or methyl shifts. What do these numbers indicate? I initially thought it would be the position of the carbon atoms involved in the shift, in the principal chain, but that was probably wrong because a shift occurring at the 3rd carbon atom was also called a 1,2 shift. Help?
