This indicates the use of a specific reagent, R2AlCl (dialkylaluminum chloride), as a promoter or catalyst for the reaction. Organometallic compounds, like alkylaluminum chlorides, are often used in organic synthesis to facilitate certain reactions.
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2,2-Pyrrolidinedicarboxylic acid, 3-(2-ethoxy-2-oxoethyl)-4-(1-methylethenyl)-1-(trifluoroacetyl)-, diethyl ester, trans-
