Three nitrogen groups are bound to this element in alternative coupling agents used in solid-phase peptide synthesis, such as B·O·P and Py·B·O·P. A method of activating a palladium zero catalyst for the Heck reaction involves acetate forming a bond with (-5[1])this element. Nickel complexes to ligands containing this element were used to develop the Tolman cone angle parameter. (15[1])Berry (15[1])(*) pseudo-rotation (-5[2])is classically exemplified by this element bound to five fluorine atoms. (10[1])Many courses (-5[1])incorrectly teach (-5[1])that oxygen (10[1])binds to this element in a betaine (“beta-een”) intermediate [emphasize] after a carbon-carbon bond forms in the Wittig reaction. (10[2])For 10 points, (10[2])name this element that sits (10[1])right below nitrogen (10[2])on (10[1])the periodic (10[2]-5[1])table. (10[1])■END■ (10[5]0[4])