Fluorophosphoranes tetrafluorophosphorane

A related group of reagents to FAR and DAST is the phenylfluorophosphoranes. The mechanism is believed to be similar but the reactivity increases with the degree of fluorination. While the di- and tri-fluorophosphoranes require 150 C for the conversion of primary alcohols to primary fluorides (equation 41) 11S.U6 tetrafluorophosphorane converts cholesterol to fluorocholesterin with inversion of configuration at 20 C (equation 42)." ... [Pg.217]

Full details are now available on the intramolecular donor-acceptor interaction which occurs in fluorophosphoranes substituted with a 2-methylquinoline group.In the tetrafluoride (32 R = F) the phosphorus is octahedrally coordinated, with a P—N bond length of 1.91 while the product from phenyl-tetrafluorophosphorane (32 R = Ph) contains a plane of symmetry through the... [Pg.291]

The bis(trimethylsilyl) ether (36) with fluorophosphoranes gave the monocyclic phosphoranes (37), except with tetrafluorophosphoranes and... [Pg.39]

Tetrafluorophosphoranes also result from heating phosphonous difluorides (6.500), or from pen-tapolyphosphine (6.516). Siloxanes may be used to obtain alkoxy fluorophosphoranes (6.517). [Pg.399]

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