Antimony salt, Beckmann rearrangement

In the presence of a catalytic amount of an antunony(V) salt (SbCU SbFe ), generated from antimony(V) chloride and silver hexafluoroantimonate, the Beckmann rearrangement of several ketoxime trimethylsilyl ethers proceeds smoothly to give the corresponding amides or lactams in good yields . ... [Pg.403]

Beckmann rearrangement. The antimony(V) salt 1 is an effective catalyst for Beckmann rearrangement of ketoxime trimcthylsilyl ethers to amides or lactams. ... [Pg.17]

Phosgene reacts with oximes to form 0-(ch oroformyl) oximes 124, which, on addition of antimony pentachloride, undergo smooth Beckmann rearrangement with loss of carbon dioxide to give the nitrilium salts 125 almost quantitatively [66]. With oxygen or nitrogen nucleophiles, O-(chloroformyl) oximes 124 form symmetrical and unsymmetrical oxalyl derivatives. [Pg.71]

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