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What (who) is hindrance$35262$ - definition
GEOMETRIC ASPECTS OF IONS AND MOLECULES AFFECTING THEIR SHAPE AND REACTIVITY
Steric hindrance; Steric; Sterics; Sterically hindered; Steric effect (chemistry); Steric effect; Steric interaction; Steric repulsion; Steric shielding; Hindered; Steric bulk; Sterical; Sterically; Steric repulsions; Steric limit; Steric limits; Steric limitation; Steric clashes; Steric clash; Steric crowding
![The A-value for a [[methyl]] group is 1.74 as derived from the [[chemical equilibrium]] above. It costs 1.74 kcal/mol for the methyl group to adopt to the axial position compared to the equatorial position.](https://commons.wikimedia.org/wiki/Special:FilePath/Methyl group cyclohexane.png?width=200 "The A-value for a [[methyl]] group is 1.74 as derived from the [[chemical equilibrium]] above. It costs 1.74 kcal/mol for the methyl group to adopt to the axial position compared to the equatorial position.")
![electrophilic]] reactions, like forming the tetra[[alkyl]][[ammonium]] cation, difficult. It is difficult for electrophiles to get close enough to allow attack by the [[lone pair]] of the nitrogen (nitrogen is shown in blue)](https://commons.wikimedia.org/wiki/Special:FilePath/Triterbutilamin.JPG?width=200 "electrophilic]] reactions, like forming the tetra[[alkyl]][[ammonium]] cation, difficult. It is difficult for electrophiles to get close enough to allow attack by the [[lone pair]] of the nitrogen (nitrogen is shown in blue)")
![stabilizer]] in polymers.](https://commons.wikimedia.org/wiki/Special:FilePath/BigPhosphite31570-04-4.png?width=200 "stabilizer]] in polymers.")
S-1 100.svg?width=200 "isbn=978-3-527-30673-2 }}")
![[[Titanium isopropoxide]] is a monomer, the corresponding [[titanium ethoxide]] is a tetramer.](https://commons.wikimedia.org/wiki/Special:FilePath/Ti(OiPr)4.png?width=200 "[[Titanium isopropoxide]] is a monomer, the corresponding [[titanium ethoxide]] is a tetramer.")
Steric effects
Steric effects arise from the spatial arrangement of atoms. When atoms come close together there is a rise in the energy of the molecule.
Hindered
·Impf & ·p.p. of Hinder.
steric
['st?r?k, 'st??r?k]
¦ adjective Chemistry relating to the spatial arrangement of atoms in a molecule, especially as it affects reactions.
Derivatives
sterically adverb
Origin
C19: formed irregularly from Gk stereos 'solid' + -ic.
Wikipedia
Steric effects
Steric effects arise from the spatial arrangement of atoms. When atoms come close together there is generally a rise in the energy of the molecule. Steric effects are nonbonding interactions that influence the shape (conformation) and reactivity of ions and molecules. Steric effects complement electronic effects, which dictate the shape and reactivity of molecules. Steric repulsive forces between overlapping electron clouds result in structured groupings of molecules stabilized by the way that opposites attract and like charges repel.
