8398. Schwesinger P4 Base

Nomenclature

CAS number: 111324-04-0
(1,1-Dimethylethyl)tris[tris(dimethylamino)phosphoranylidene]phosphorimidic triamide; t-Bu-P4.
C22H63N13P4; mol wt 633.72.
C 41.70%, H 10.02%, N 28.73%, P 19.55%.

Description and references

Sterically hindered polyiminophosphazene base. Prepn: R. Schwesinger, H. Schlemper, Angew. Chem. Int. Ed. 26, 1167 (1987); and properties: R. Schwesinger et al., Ann. 1996, 1055. Use as promoter for ethylene oxide polymerization: B. Esswein et al., Macromol. Symp. 107, 331 (1996); for copolymer formation: S. F"orster, E. Kr"amer, Macromolecules 32, 2783 (1999).

Chemical structure

Properties

Colorless crystalline solid, mp 207°. Sublimes at 0.001 torr. Hydrophilic and lipophilic; deliquesces in moist air and hexane vapors at room temp.

Use

Promoter for polymerizations; nonnucleophilic base.