Strategic Use of Functional Group Equivalents

The possibilities for assembling carbogenic structures have sharply increased in recent years with the advent of various synthetic strategies for generating the equivalents of carbon electrophiles and nucleophiles which are unavailable in structures containing simple core functional groups such as carbonyl, amino, or hydroxyl. For example, acyl anions (RCO), which for various reasons are not readily available, can be utilized in synthesis in modified or equivalent forms. Several acyl anion 

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