In an article, published in an article, once mentioned the application of 1038-95-5, Name is Tri-p-tolylphosphine,molecular formula is C21H21P, is a conventional compound. this article was the specific content is as follows.Safety of Tri-p-tolylphosphine
We report herein a convenient route to the synthesis of aryl-substituted gamma-lactones bearing an alpha-phosphorus ylide moiety through the assembly of dimethyl acetylenedicarboxylate (DMAD), electron-deficient aldehydes, and triaryl-or trialkylphosphanes in moderate to good yields. The formation of gamma-lactones is highly dependent on the reaction time, the phosphane nucleophile, and the molar ratio of DMAD, aldehyde, and phosphane. We found that reactions with a DMAD/aldehyde/tri-p-tolylphosphane molar ratio of 3:1:6 and more electron-deficient aldehydes, such as 4-nitrobenzaldehyde and 4-chloro-3-nitrobenzaldehyde, gave good yields. The isolated ylides reacted with aldehydes as Wittig reagents to give olefins in moderate yields.
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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