Priya Nair, global head of credit structuring at Citigroup in London, has taken the additional role of head of structured credit syndicate. Her new title is global head of synthetics. She could not immediately be reached. Michael Raynes, global head of collateralized debt obligations and structured credit at Citi in New York, referred calls to Nestor Dominguez, head of CDOs in New York, who did not return a phone call. Jeff French, Citi spokesman in London, declined immediate comment.