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 (*) pseudo-rotation is classically exemplified by this element bound to five fluorine atoms. Many courses (-5[1])incorrectly teach (-5[1])that (15[1])oxygen binds to (10[1])this element (10[1])in a betaine (“beta-een”) intermediate [emphasize] (10[1])after a carbon-carbon bond forms in the Wittig reaction. (10[2])For 10 (10[2])points, (10[2])name this element that sits (10[1])right below nitrogen (10[1])on (10[1])the periodic table. (10[1])■END■ (10[2]0[3])