Phosphoranes are also considered to be one of the resonance structures of ylides, these compounds feature a tetrahedral phosphorus center including a phosphorus carbon double bond.
32.
However, in NBO calculations, " covalent-ionic resonance " is not needed due to the inclusion of bond-polarity effects in the resonance structures.
33.
However, as the metal carbonyl article explains, you can write several resonance structures, even one with negative charge on the oxygen and a single bond.
34.
The resonance structures of the quinoid "'3a "'and the biradical "'3b "'contribute equally to the hybrid structure.
35.
Pentacene reacts with elemental sulfur in pm ); from this, it follows that resonance structures B and C with complete charge separation are more significant than structure A.
36.
It doesn't explain why the proton on the same side but on the 5-ring is not lost as the corresponding anion also has 4 resonance structures.
37.
My hypothesis is that the inductive effect is also at play, where having a carbanion resonance structure next to a ( protonated ) oxygen atom will stabilise it somewhat.
38.
Akin to carbon monoxide, isocyanides are described by two resonance structures, one with a triple bond between the nitrogen and the carbon and one with a double bond between.
39.
Mesoionic carbenes ( MICs ) are similar to N-heterocyclic carbenes ( NHCs ) except that canonical resonance structures with the carbene depicted cannot be drawn without adding additional charges.
40.
Chemist Linus Pauling further developed this idea and arrived at two resonance structures involving a double bond on one side and a single bond plus three-electron bond on the other.
