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 unique -hemiaminal ether gold carbene intermediates were accessed by a gold - catalysed 1,1-carboalkoxylation strategy and evolved through a highly selective 1,2-n - migration . 
 this skeletal rearrangement gave functionalised indenes , and isotopic labelling confirmed the rare c  
 n bond cleavage of the ynamide moiety 
 . the effect of substituents on the migration has been explored , and a model is proposed to rationalise the observed selectivity . 
Supporting Information