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The simple phosphonium salts 4 and 5 have been fully characterised for the first time and are found by NMR spectroscopy to exist in CDCl 3 solution mainly as the E and Z enol structures b and c. The salt 6 exists as a mixture of the keto form a and one enol form assumed to be b. Similarly the bis(phosphonium salt) 16 exists entirely with one end in the keto form and the other in the enol form...
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