41. In many nucleophilic reactions, addition to the carbonyl group is very important. 42. In this reaction an oxygen is regioselectively inserted near an adjacent carbonyl group. 43. Acid-Catalyzed Synthesis of Carbonyl Ylides from Hydroxy-3-Pyrones. 44. However, it is uncertain whether the metallocarbene intermediate generates the carbonyl ylide. 45. Finally, deprotonation of the oxygen of the carbonyl group produces the ester. 46. For example, the related unsaturated esters from carbonyl compounds such as benzaldehyde: 47. In the Mond process, nickel carbonyl is used to produce pure nickel. 48. Carbon monoxide has different binding modes in metal carbonyls . 49. Other metal carbonyls are prepared by less direct methods. 50. Several models exist to describe chiral induction at carbonyl carbons during nucleophilic additions.
