Schwesinger P4 Base
Title: Schwesinger P4 Base
CAS Registry Number: 111324-04-0
CAS Name: (1,1-Dimethylethyl)tris[tris(dimethylamino)phosphoranylidene]phosphorimidic triamide
Additional Names: t-Bu-P4
Molecular Formula: C22H63N13P4
Molecular Weight: 633.72
Percent Composition: C 41.70%, H 10.02%, N 28.73%, P 19.55%
Literature 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. Förster, E. Krämer, Macromolecules 32, 2783 (1999).
Properties: Colorless crystalline solid, mp 207°. Sublimes at 0.001 torr. Hydrophilic and lipophilic; deliquesces in moist air and hexane vapors at room temp.
Melting point: mp 207°
Use: Promoter for polymerizations; nonnucleophilic base.

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