WebTo "donate electron density" means that the electrons from the "donor" bond spend some of their time in the "receiving" bond. This happens in a way that minimizes the overall energy of the molecule – in the case of an alkene, the sp2 orbitals (contributing to the double bond) want electrons a bit more than the sp3 orbitals of the donor bonds§. http://polymerdatabase.com/polymer%20physics/Cis-Trans.html
Stereoisomers - Michigan State University
WebOct 5, 2024 · Ammonia (NH 3) - Ammonia also has a steric number of 4 because it has 3 hydrogen atoms bonded to nitrogen and 1 lone electron pair. Ethylene (C 2 H 4) - Ethylene has 3 bonded atoms and no lone … http://polymerdatabase.com/polymer%20physics/Cis-Trans.html atari 2008
Steric Arrangements
WebStereoisomerism about double bonds arises because rotation about the double bond is restricted, keeping the substituents fixed relative to each other. If the two substituents on at least one end of a double bond are … WebThe 1,1-disubstituted monomers have values of (−ΔH p) lower than those for monosubstituted monomers by 20–40 kJ mo −1, this representing the steric strain built into the chains. The high C C bond strength in fluorocarbons probably contributes to the high value of −ΔH p for tetra-fluoroethylene. WebConformational isomerism. Rotation about single bond of butane to interconvert one conformation to another. The gauche conformation on the right is a conformer, while the eclipsed conformation on the left is a transition state between conformers. Above: Newman projection; below: depiction of spatial orientation. asis atlanta