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Topic: pi acidity of ligands  (Read 6039 times)

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Offline ashish

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pi acidity of ligands
« on: August 14, 2017, 05:38:59 AM »
i have to arrange the following ligands :- PPh3 , PMe3 , PH3 , P(OR)3 , PF3

in decreasing pi acidity

can anyone pls help ??

my answer - PPh3 > PF3 > PH3 > PMe3 > P(OR)3

is this correct ???

pls help
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Offline Flatbutterfly

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Re: pi acidity of ligands
« Reply #1 on: September 01, 2017, 04:19:14 PM »
The π-acceptor capacity of the P ligands follow the order
PF3>P(OR)3>PPh3>PH3>PMe3
Look up Tolman electronic parameter to confirm
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Offline Flatbutterfly

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Re: pi acidity of ligands
« Reply #2 on: September 07, 2017, 03:56:17 PM »
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Offline Flatbutterfly

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Re: pi acidity of ligands
« Reply #3 on: September 15, 2017, 12:53:15 PM »
The original reference on the electronic and steric properties of P-ligands is: Tolman, C. A. Chem.Rev.1977, 77, 313.
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