Silicon-substituted cyclic compounds have been used as "pumps" to generate this class of chemicals in the formation of block copolymers.  Laser flash photolysis of ketoprofenate produces an example of this class of compounds that is unusually unreactive with water.  In unimolecular elimination via the conjugate base, the intermediate is one of these compounds.  Wittig-Horner and Horner-Emmons reactions use resonance-stabilized phosphonate examples of these in place of th
Silicon-substituted cyclic compounds have been used as "pumps" to generate this class of chemicals in the formation of block copolymers.  Laser flash photolysis of ketoprofenate produces an example of this class of compounds that is unusually unreactive with water.  In unimolecular elimination via the conjugate base, the intermediate is one of these compounds.  Wittig-Horner and Horner-Emmons reactions use resonance-stabilized phosphonate examples of these in place of the phosphonium ylide, and in the first step of the malonic ester synthesis, diethyl malonate is treated with sodium to generate this type of reactive species.  Less substituted examples of these are more stable, and they have the same electron structures as analogous amines, though they are stronger nucleophiles.  For 10 points, name these compounds that contain a trivalent carbon atom with a negative charge.
Silicon-substituted cyclic compounds have been used as "pumps" to generate this class of chemicals in the formation of block copolymers.  
carbanions