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Influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene

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Abstract

We report the influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene TerP[double bond, length as m-dash]PTer (1; Ter = 2,6-Mes2C6H3; Mes = 2,4,6-Me3C6H2), a phosphorus-analogue of an alkene. The diphosphene 1 itself is completely inert towards water. However, NHCs have been found to activate 1 towards ready hydrolysis. While sterically less-encumbered NHCs react with 1 affording NHC-adducts which are in equilibrium with 1 in solution, sterically encumbered NHCs do not bind to 1 at all. Interestingly, in both of these situations hydrolysis of the P[double bond, length as m-dash]P motif proceeds efficiently. At low temperatures, sterically less-encumbered NHCs are catalytic while the sterically encumbered NHCs play a catalytic role at room temperature. To gain insight on this striking influence of NHCs on the hydrolysis of diphosphene detailed low-temperature 31P-NMR studies along with theoretical calculations have been carried out. In addition, systematic hydrolysis studies of all the NHCs used in this study have also been performed.

Graphical abstract: Influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene

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Article information


Submitted
09 Dec 2019
Accepted
23 Dec 2019
First published
23 Dec 2019

Dalton Trans., 2020, Advance Article
Article type
Communication

Influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene

D. Dhara, S. Das, P. Kalita, A. Maiti, S. K. Pati, D. Scheschkewitz, V. Chandrasekhar and A. Jana, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04690A

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