The first example of a stable, doubly oxidized carbene has been made by chemists in pursuit of octet-rule-defying molecules. Most carbon atoms possess 8 valence electrons, which is why they are said ...

Figure 1: Valence states of the triangular and tetrahedral elementary blocks. Note that the duet rule elucidated here is akin to the textbook octet rule, a well-known and the first chemical rule of ...