Syn addition Linalar catalyst generates olefins

Trans addition Reduction reaction of alkali metal and liquid ammonia to produce alkenes

reason

Π-Π conjugated system characteristics

p-Π conjugation

hyperconjugation

s-cis

s-trans

The same number of covalent bonds contribute the same

Resonance formulas that satisfy the octet are more stable than those that do not.

In the resonance formula that satisfies the octet, atoms with large electronegativity are negatively charged, and atoms with small electronegativity and positive charge are more stable.

Contribution with charge separation is smaller than without charge classification

Those with more covalent bonds are more stable than those with fewer covalent bonds

Large deformation of bond angles and bond lengths will result in small contribution

Influencing factors

carbocation

1,4-addition of conjugated dienes, carbon-carbon double bonds, and carbon-carbon triple bond compounds for ring closure