Priority of carbons attached to chiral group, one with double bonded oxygen, one with two oxygens I have a chiral carbon. Two of the atoms attached to the carbon are other carbon atoms. One of those carbons has a double bonded oxygen and a methyl group attached. The other has two oxygens and a methyl group. Which carbon substituent has higher priority?
Given the same atom, those bond via triple bonds have higher precedence over double and double bonds have higher precedence over single. This is exemplified here and, a bit more formal covering all CIP-rules, here.