A term for this kind of interaction symbolized with a lowercase delta was added to the Hammett equation by Taft.
One set of parameters that quantify these effects include the width parameters B1 through B5 and the length parameter L; those factors were developed by Verloop. Charton's nu modifies another equation used to determine these effects. A term for this kind of interaction symbolized with a lowercase delta was added to the Hammett equation by Taft. The cross section of reactive collisions over the total number of collisions gives a "factor" named this, which is multiplied by the (*) collision frequency to find the pre-exponential factor. The Hoffmann product is preferred over the Zaitsev product in eliminations using bases that use this effect, like tert-butoxide. This effect is the reason why SN2 reactions are very slow in tertiary systems. For 10 points, name this effect in which bulky functional groups interfere with each other.
One set of parameters that quantify these effects include the width parameters B1 through B5 and the length parameter L; those factors were developed by Verloop.
steric effects [or steric hindrance or steric resistance or steric factors; basically you need the word "steric"]