Stepanov, B. I. published the artcileSynthesis of trimesitylphosphine and tetramesityldiphosphine, Name: Dimesitylphosphine oxide, the publication is Zhurnal Obshchei Khimii (1969), 39(7), 1544-9, database is CAplus.
To RMgBr from 15.92 g. bromomesitylene was added 1.8 ml. PCl3 in tetrahydrofuran (THF) and the mixture refluxed 2 hrs. and worked up to give 29% trimesitylphosphine (I), m. 192-3¡ã, isolated through its HCl salt. The filtrate from the latter gave on evaporation dimesitylphosphine oxide (II), 6%, m. 132-40¡ã. Refluxing 15 g. bromomesitylene, 8 g. Na, and 2.22 ml. PCl3 in C6H6 80 hrs. gave 6% I. Heating I with MeI 6 hrs. gave the methiodide, decomposed 314-17¡ã, which with Na picrate in aqueous EtOH gave the corresponding picrate, m. 183.5-84¡ã. I and 20% H2O2 in Me2CO gave trimesitylphosphine oxide, m. 210-10.5¡ã. II and H2O2 in MeCOEt refluxed 4 hrs. gave dimesitylphosphinic acid, m. 208-9¡ã, also formed by heating II 1 hr. at 150¡ã and extracting with aqueous NaHCO3, then acidifying the extract RMgBr from 9.95 g. bromomesitylene treated in THF with 1.8 ml. PCl3 and heated 2 hrs. gave after an aqueous treatment (NH4Cl) 33% tetramesityldiphosphine (III), decomposed 200-15¡ã, while the filtrate gave 5% I; use of PBr3 gave the same result, while inverted order of mixing gave 35% and 2.5% yields of these, resp. III monomethiodide m. 274-6¡ã; picrate m. 198.5-9.5¡ã. Treating 1.08 g. III with 3.52 ml. 20% H2O2 in Me2CO suspension and refluxing 4 hrs. gave on evaporation 80% III monoxide, m. 205-8¡ã; with a larger amount H2O2 the reaction gave II dioxide, m. 188-90¡ã. Ir and uv spectral curves are reported.
Zhurnal Obshchei Khimii 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 C19H21N3O3S, Name: Dimesitylphosphine oxide.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia