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- W2103608923 abstract "Abstract When treated with either butyllithium or lithium diisopropylamide, 1‐( p ‐methoxybenzyl)pyrazole undergoes metalation at the exocyclic α‐position but mutates to the 5‐lithio species in the course of few minutes or hours. Trapping the intermediates with a rapidly reacting electrophile such as chlorotrimethysilane or carbon dioxide offers selective access to either of the two possible regioisomers. On the other hand, the relatively inert 1‐iodobutane and butyl trifluoromethanesulfonate (“triflate”) inevitably give rise to product mixtures, as the 5‐lithio species is more slowly intercepted than it can revert to the α‐metallomer by a rapid, though intermolecular, dynamic equilibration process. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)" @default.
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- W2103608923 date "2006-04-26" @default.
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- W2103608923 title "Metalated 1-(p-Methoxybenzyl)pyrazole: A Structural Chameleon" @default.
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- W2103608923 doi "https://doi.org/10.1002/ejoc.200600029" @default.
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