Abstract
Abstract Reaction of (CF3CH2O)3P with diols yielded new monocyclic pentaoxyphosphoranes with eight-membered ring systems containing methylene or sulfur bridges. Trigonal-bipyramid (TBP) geometries were shown to be present by X-ray analysis for CH2(C6H4O)2P(OCH2CF3)3 (2) and S(Me3C6H2O)2P(OCH2CF3)3 (3) with the ring in 2 located in axial-equatorial (a–e) positions and the ring in 3 in diequatorial (e–e) sites. These structures are compared with the first pentaoxyphosphorane derivative to exhibit a diequatorial ring in a TBP, CH2[Me(t-Bu)C6H2O]2P(OCH2CF3)3 (1), recently prepared in our laboratory. A pseudooctahedral structure was revealed by X-ray analysis for S[(t-Bu)2C6H2O]2P(OCH2CF3)3 (4). 1H, 31P, and 19F solution NMR data indicated rapid intramolecular ligand exchange for 2 and 3 at room temperature. In contrast, NMR data on 1 and 4, which contained tert-butyl groups, did not indicate exchange behavior. Here, retention of the basic solid-state TBP in solution was consistent with the observed spectra. C...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Phosphorus, Sulfur, and Silicon and the Related Elements
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
