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- W1971569052 abstract "It has been shown that the regioselectivity of the palladium catalyzed telomerization of isoprene and diethylamine is drastically changed by the use of acidic co-catalysts. The tail-to-tail terpene amine is formed in the absence of acids, whereas the use of weak acids such as CO2 favours the formation of the head-to-tail and tail-to-head isomers. A variety of Brönsted and Lewis acids has been examined and it has been shown that a gradual shift towards increased formation of the tail-to-head and a new head-to-head isomer occurs with increasing acid concentration and strength. When strong acids such as BF3 · Et2O were used in combination with a basic ligand such as tricyclohexyl-phosphine, the head-to-head isomer was formed with a selectivity of up to 80%. A mechanistic model is proposed involving cationic palladium intermediates in an attempt to explain the observed selectivities." @default.
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- W1971569052 date "1983-08-01" @default.
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- W1971569052 title "Control of regioselectivity in the palladium catalyzed telomerization of isoprene with diethylamine; synthesis of a new head-to-head terpene amine" @default.
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- W1971569052 doi "https://doi.org/10.1016/0304-5102(83)83003-x" @default.
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