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- W2607247946 abstract "Abstract The reaction of the bulky diphosphenes (Rind)P=P(Rind) ( 1 ; Rind=1,1,3,3,5,5,7,7‐octa‐R‐substituted s ‐hydrindacen‐4‐yl) with two molecules of N‐heterocyclic carbene (NHC; 1,3,4,5‐tetramethylimidazol‐2‐ylidene) resulted in the quantitative formation of the NHC‐bound phosphinidenes NHC→P(Rind) ( 2 ), along with the cleavage of the P=P double bond. The reaction times are dependent on the steric size of the Rind groups (11 days for 2 a (R=Et) and 2 h for 2 b (R=Et, Me) at room temperature). The mechanism for the double bond‐breaking is proposed to proceed via the formation of the NHC‐coordinated, highly polarized diphospehenes 3 as an intermediate. Approach of a second NHC to 3 induces P−P bond cleavage and P−C bond formation, which proceeds through a transition state with a large negative Gibbs energy change to afford the two molecules of 2 , thus being the rate‐determining step of the overall reaction with the activation barriers of 80.4 for 2 a and 29.1 kJ mol −1 for 2 b ." @default.
- W2607247946 created "2017-04-28" @default.
- W2607247946 creator A5004626824 @default.
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- W2607247946 creator A5084338990 @default.
- W2607247946 date "2017-04-21" @default.
- W2607247946 modified "2023-10-17" @default.
- W2607247946 title "Cleavage of a P=P Double Bond Mediated by N-Heterocyclic Carbenes" @default.
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- W2607247946 doi "https://doi.org/10.1002/anie.201701201" @default.
- W2607247946 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28429503" @default.
- W2607247946 hasPublicationYear "2017" @default.
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