I found the field of Chemistry very interesting. Saw the article Chiral terpene auxiliaries V: Synthesis of new chiral gamma-hydroxyphosphine oxides derived from alpha-pinene published in 2019.0. HPLC of Formula: C7H5NO4, Reprint Addresses Krzeminski, MP (corresponding author), Nicolaus Copernicus Univ Torun, Fac Chem, 7 Gagarin St, PL-87100 Torun, Poland.. The CAS is 62-23-7. Through research, I have a further understanding and discovery of 4-Nitrobenzoic acid
New chiral regioisomeric gamma-hydroxyphosphine ligands were synthesized from alpha-pinene. The key transformation was the thermal [2,3]-sigmatropic rearrangement of allyldiphenylphosphinites, obtained from (1R,2R,4S,5R)-3-methyleneneoisoverbanol and (1R,2R,3R,5R)-4-methyleneneoisopinocampheol, to allylphosphine oxides. Hydroxy groups were introduced stereoselectively through a hydroboration-oxidation reaction proceeding from the less hindered site providing a trans relationship between the hydroxy and the phosphine substituents.
About 4-Nitrobenzoic acid, If you have any questions, you can contact Kmieciak, A; Krzeminski, MP or concate me.. HPLC of Formula: C7H5NO4
Reference:
Phthalazine – Wikipedia,
,Phthalazine | C8H6N2 – PubChem