("hemi" ASS-et-alls) and acetals have this geometry.
Thorpe and Ingold proposed an explanation for why replacing hydrogen with alkyl groups on compounds with this geometry could accelerate cyclization reactions. The high ring strain in the simplest propellanes causes this geometry to be inverted at each bridgehead. Intermediates with this geometry are formed after a nucleo•phile pushes a pair of electrons from a carbon to an (*) oxygen in the first step of nucleophilic acyl substitution. Hemi•acetals ("hemi" ASS-et-alls) and acetals have this geometry. A•X•four•E•zero describes this shape in VSEPR ("VESPER") theory, in which the central atom is sp3 hybridized and each bond angle is 109.5 degrees. For 10 points, name this molecular geometry of methane in which four substituents are bonded to a central atom.
Thorpe and Ingold proposed an explanation for why replacing hydrogen with alkyl groups on compounds with this geometry could accelerate cyclization reactions.
tetrahedral [or word forms] &lt;Garg&gt;