Dahn, Hans published the artcileNMR of terminal oxygen. Oxygen-17 NMR of the phosphorus-oxygen ‘double bond’: phosphine oxides, phosphinates, phosphonates, acylphosphonates and related compounds, COA of Formula: C18H23OP, the publication is Magnetic Resonance in Chemistry (1992), 30(11), 1089-96, database is CAplus.
The 17O NMR spectra of P-bound O atoms in secondary phosphine oxides (R2HPO), alkyl phosphinates [RHP(O)OR’ and R2P(O)OR’], dialkyl phosphonates [RP(O)(OR’)2], dialkyl acylphosphonates [RCOP(O)(OR’)2] and some related compounds were measured. The signals of terminal O appear at high field, only slightly downfield from those of bridge O. Compared with carbonyl O, terminal P-O shows lower sensitivity to structural variations, notably to geminal groups (with the exception of Cl and Br), and a very low sensitivity to arene ring substituents. The difference is discussed in terms of ¦Ð-bond character; the carbonyl O of RCOP(O)(OR’)2 is sensitive to variations in structure.
Magnetic Resonance in Chemistry published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, COA of Formula: C18H23OP.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia