Reference of 4020-99-9, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Conference Paper，once mentioned of 4020-99-9
The new Cp*Ru(II) (Cp*: pentamethylcyclopentadienyl) complexes Cp*(dab-R)RuCl, [Cp*(dab-R)(MeCN)Ru][PF6] (dab-R: RNCH-CHNR; R: iso-propyl, mesityl), and [Cp*(cod)(MeCN)Ru][PF 6], are synthesized in high yields by reacting the corresponding alpha-diimine or 1,5-cyclooctadiene with [Cp*RuCl]4 and [Cp*(MeCN)3Ru][PF6], respectively. The alpha-diimine ligands are strongly bonded to the ruthenium centre as shown by the subsequent formation of the alkynyl derivatives Cp*(dab-R)RuCCR? (R? = tert-butyl or phenyl) and of the cationic derivatives [Cp*(dab-R)(L)Ru][PF6] (L = CO, PMe3). The neutral and cationic alpha-diimine or 1,5-cyclooctadiene ruthenium complexes are compared as catalyst precursors for the ruthenium-catalyzed allylation of diethyl-sodiomalonate and diethylamine with cinnamyl acetate or ethyl cinnamyl carbonate.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 4020-99-9 is helpful to your research., Reference of 4020-99-9
Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate