1,3,2-Dioxaphospholens from hexafluorobiacetyl and trivalent phosphorus compounds

✍ Scribed by J.I. Dickstein; S. Trippett

• Book ID: 104238923
• Publisher: Elsevier Science
• Year: 1973
• Tongue: French
• Weight: 105 KB
• Volume: 14
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)87595-x

✦ Synopsis

Ramirez and Kugler' recently reported the formation of a stable pentacovalent 1,3,2-dioxaphospholen (1; A,B = OPh) from hexafluorobiacetyl (HFBA) and triphenyl phosphite at -70' in dichloromethane. We have independently obtained similar adducts from HFBA and a variety of trivalent phosphorus compounds and have studied their variable-temperature lgF n.m.r. spectra in order to gain more data on the relative apicophilicities of groups in pentacovalent phosphoranes.2 The most stable conformer of an adduct in which A is more apicophilic than B is as shown in (1). The CFJ groups become equivalent by pseudorotation *the higher energy topomers (2)