That type is most often produced by deprotonating an azolium salt and is the N-heterocylic type of these compounds.
One of these compounds isolated by Bertrand features a carbon bonded to a phosphorus and a silicon and is sometimes referred to as the "push-pull" type of these. Either a cyanide anion or one type of these can serve as the catalyst for the benzoin condensation and the Stetter reaction. That type is most often produced by deprotonating an azolium salt and is the N-heterocylic type of these compounds. The Wanzlick equilibrium describes the dimerization of relatively stable ones, and Arduengo is credited with isolating the first stable crystalline ones. They can be formed via the photolysis of diazoalkanes, and they can be added to alkenes to form cyclopropanes in the Simmons-Smith reaction. One of these attaches to a ruthenium atom in a catalyst for olefin metathesis, Grubbs' catalyst, and complexes involving these and metals include the Fischer and Schrock varieties. Existing in singlet and triplet states, for 10 points, name these neutral species in which a divalent carbon has two unshared electrons.
One of these compounds isolated by Bertrand features a carbon bonded to a phosphorus and a silicon and is sometimes referred to as the "push-pull" type of these.
carbenes