January 24, 2022, 05:12:32 AM
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Topic: Hydroesterification styrene  (Read 199 times)

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Limon

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Hydroesterification styrene
« on: January 05, 2022, 07:42:45 AM »
Hello guys, I need your help on an exercise. I have to write the mechanism of hydroesterification of styrene. In the exercise they gave me the complex  : [(dippe)Ni(PhCHCH2)], CO, MeOH and a styrene. So, for me, the complex got 16 electrons because dippe and styrene are L ligands, and NiĀ° = 10 electrons. In the first step of the mechanism they said that the oxidation state of my complex is changed by 2 units. So that means that 2 ligands X are added on my Nickel. But I don't know which ligands are linked to my nickel. Is that styrene ?

Thank you for your help (sorry for my English, not my first language).

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« Last Edit: January 05, 2022, 05:23:33 PM by sjb »

Offline Orcio_87

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Re: Hydroesterification styrene
« Reply #1 on: January 05, 2022, 10:44:17 AM »
Quote
In the first step of the mechanism they said that the oxidation state of my complex is changed by 2 units. So that means that 2 ligands X are added on my Nickel.
If oxidation state increased by 2 it means (for example) reaction with Cl2, Br2, 2 units of HCN.
If oxidation state decreased by 2 it means (for example) reaction with 2 units of NO.

Decrease of oxidation state is also possible as dippe (as phosphine ligand) can stabilize negative oxidation state as does CO.
« Last Edit: January 05, 2022, 01:19:31 PM by Orcio_87 »

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