Preferred Label : electron-transfer catalysis;
IUPAC definition : The term indicates a sequence of reactions such as shown in equations (1)–(3), leading
from A to B : table tr td \[{A} {e} {-} \rightarrow {A} {\cdot- }\] /td
td (1) /td /tr tr td \[{A} {\cdot- } \rightarrow {B} {\cdot- }\] /td td
(2) /td /tr tr td \[{B} {\cdot- } {A} \rightarrow {B} {A} {\cdot- }\]
/td td (3) /td /tr /table An analogous sequence involving radical cations (A
sup class plus /sup ·, B sup class plus /sup ·) is also observed.
The most notable example of electron-transfer catalysis is the S RN 1 (or T D N
A N) reaction of aromatic halides. The term has its origin in a suggested analogy
to acid-base catalysis, with the electron instead of the proton. However, there is
a difference between the two catalytic mechanisms, since the electron is not a true
catalyst, but rather behaves as the initiator of a chain reaction. 'Electron-transfer
induced chain reaction' is a more appropriate term for the situation described by
equations (1)–(3).;
Origin ID : E02012;
See also
The term indicates a sequence of reactions such as shown in equations (1)–(3), leading
from A to B : table tr td \[{A} {e} {-} \rightarrow {A} {\cdot- }\] /td
td (1) /td /tr tr td \[{A} {\cdot- } \rightarrow {B} {\cdot- }\] /td td
(2) /td /tr tr td \[{B} {\cdot- } {A} \rightarrow {B} {A} {\cdot- }\]
/td td (3) /td /tr /table An analogous sequence involving radical cations (A
sup class plus /sup ·, B sup class plus /sup ·) is also observed.
The most notable example of electron-transfer catalysis is the S RN 1 (or T D N
A N) reaction of aromatic halides. The term has its origin in a suggested analogy
to acid-base catalysis, with the electron instead of the proton. However, there is
a difference between the two catalytic mechanisms, since the electron is not a true
catalyst, but rather behaves as the initiator of a chain reaction. 'Electron-transfer
induced chain reaction' is a more appropriate term for the situation described by
equations (1)–(3).
