The following mixed Claisen condensation works best when one of the starting materials is present in large excess. Which of the two starting materials should be present in excess? Why? What side reaction will compete if the reagents are present in comparable amounts? 

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NaOCH,, CH,OH CH;CH,COCH, + (CH3),CHCOCH3 (CH3),CHCCHÖOCH3 ČH3