Hydrochloric Acid → Diisobutyl-n-heptyl-phosphine oxide

Participants

Reaction Steps

For example, in the preparation of non-radioactive diisobutyl-n-heptylphosphine oxide (Methods for preparing diisobutylphosphinyl chloride by chlorinating diisobutylphosphine oxide, described by R. H. Williams, L. A. Hamilton J. Am. Chem. Soc. (1952), 74, 5418), a solution of diisobutylphosphinyl chloride (3.9 gm) in tetrahydrofuran (50 ml.) was added dropwise to a refluxing solution of n-heptylmagnesium bromide (prepared from magnesium turnings (1.2 gm), n-heptyl bromide (9.0 gm) and tetrahydrofuran (100 ml.)). The mixture was heated under reflux for 18 hours. After cooling to room temperature, the reaction mixture was poured onto ice and 2N HCl (300 ml.), and extracted with methylene dichloride. The combined extracts were washed with lithium hypochlorite solution, 2N NaOH solution and finally with water, then dried (MgSO4). The solvent was removed by distillation and the residual yellow oil (8 gm) was eluted with chloroform down a silica gel column. The product (R1=0.1 to 0.2 on silica t.l.c. (CHCl3)) was finally distilled to yield diisobutyl-n-heptyl-phosphine oxide (coded as WS148) as a colorless liquid, bp. 120° C.

Provenance & Evidence