That same reagent is used to convert alcohols and acids to esters in the (*) Mitsonobu reaction, and that molecule's salt is used to make ylides that are Wittig reagents.
This element appears in a compound along with oxygen and chlorine in a reaction that can be used to convert amides to aryl ketones, the Vilsmeier- Haack reaction, while a conversion from alcohols to alkyl chlorides, the Appel reaction, makes use of carbon tetrachloride and a molecule consisting of this element bound to three aromatic rings, arranged to make a propeller. That same reagent is used to convert alcohols and acids to esters in the (*) Mitsonobu reaction, and that molecule's salt is used to make ylides that are Wittig reagents. Along with calcium, this element is found in apatite, and consumption of an acid containing this element is linked to decreased bone density.  Forming the link between nucleotides in DNA, for 10 points, name this element, of which three are found in ATP.
This element appears in a compound along with oxygen and chlorine in a reaction that can be used to convert amides to aryl ketones, the Vilsmeier- Haack reaction, while a conversion from alcohols to alkyl chlorides, the Appel reaction, makes use of carbon tetrachloride and a molecule consisting of this element bound to three aromatic rings, arranged to make a propeller.
{phosphorus} [prompt on “P”]