Abstract
Aiming to study the interaction of gold with the highly Lewis acidic fluorenyl cation, we synthesised (o-[Ph2P(C6H4)Flu)AuCl(tht)][BF4] ([2][BF4]) and (o-Ph2P(C6H4)Flu)AuCl2 (3) (Flu = 9-fluorenyl) and found that the latter could be converted into [(o-Ph2P(C6H4)Flu)AuCl]+ ([4]+) upon treatment with NaBArF24 (BArF24 = B(3,5-C6H3(CF3)2)4). [4]+, which has been isolated as a chloride-bridged dimer, readily catalyses the cycloisomerisation of 2-allyl-2-(2-propynyl)malonate. Computational results show that [4]+ possesses a strong Au → C+ bond and readily activates enynes.
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