A reaction that converts aldehydes or ketones into alkenes uses an ylide [ILL-id] containing this element, and is named for Wittig.
Atoms of sulfur are bonded to atoms of this element in the central ring of Lawesson's reagent, and one rhodium atom is bonded to three atoms of it in Wilkinson's catalyst. Discovered by Hennig Brand, who was attempting to turn urine into gold, this element is also the central atom in the toxic nerve gases soman and sarin. A reaction that converts aldehydes or ketones into alkenes uses an ylide [ILL-id] containing this element, and is named for Wittig. This element's red allotrope is used in matches, and its white allotrope ignites spontaneously when exposed to air. For 10 points, name this element located below nitrogen on the periodic table, and symbolized P.
Atoms of sulfur are bonded to atoms of this element in the central ring of Lawesson's reagent, and one rhodium atom is bonded to three atoms of it in Wilkinson's catalyst.
{phosphorus}