Три-o-толилфосфин

Химические свойства

white to light yellow crystal powder.

Использование

Tri(o-tolyl)phosphine is used in a ruthenium-catalyzed direct amination of alcohols. It is also used in Suzuki reaction. Further, it is used in the preparation of tri-ortho-phosphinselenide by reacting with selenium as a reagent. In addition to this, it acts as a ligand in coordination chemistry.

прикладной

Tris(2-methylphenyl)phosphine (Eletriptan Impurity 13) is a phosphine catalyst. It can be used in the rhodium-catalyzed hydrogenation, Suzuki-Miyaura cross-coupling reactions and Heck reactions.

Подготовка

Tri(o-tolyl)phosphine can be obtained by the reduction of tris(o-tolyl)phosphine oxide or prepared by the 2-bromotoluene Grignard reaction.
Procedure: To a solution of magnesuim turnings (3.11 g, 128 mmol, 3.5 equiv) in THF (50 mL) was added a small amount of 2-bromotoluene (1 mL) and 1 iodine crystal. The reaction vessel was heated until initiation occurred, where upon a solution of the remaining 2-bromotoluene (20 g, 117 mmol, 3.2 equiv in total) in THF (100 mL) was added. The reaction was set to reflux for 2 hours (colour change to black solution), after which it was cooled to 0 oC and a solution of phosphorus trichloride (5.01 g, 36.5 mmol, 1 equiv) in THF (30 mL) was added dropwise. Upon addition completion the reaction was set to reflux for 18 hours. The reaction was allowed to cool to room temperature, whereupon NH4Cl solution was added with care. The resulting solution was extracted with ether (3 x 100 mL), dried over MgSO4, filtered and concentrated in vacuo. The resulting white solid was recrystalised from ethanol to yield Tri(o-tolyl)phosphine as a white solid. (6.8 g, 62 %)

Профиль реактивности

Tri(o-tolyl)phosphine is suitable for the following reaction types: Cross Couplings, Silylations, Buchwald-Hartwig Cross Coupling Reaction, Heck Reaction, Negishi Coupling, Stille Coupling, Suzuki-Miyaura Coupling.

Методы очистки

It crystallises from EtOH [Boert et al. J Am Chem Soc 109 7781 1987]. [Beilstein 16 III 835.]