Wednesday, January 6, 2010

Numbering carbons in pyran?

How would one go about numbering the 5 carbons that are in pyran? Would you start with the carbon to the right of the oxygen at the top and number 1-5 clockwise?





But my research has come up with the bottom carbon being carbon 4. How does this work? Someone please help.Numbering carbons in pyran?
The oxygen is position #1


The carbon adjacent to the oxygen is #2



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