Multiple-photon chemistry in the laser-jet: photochemistry of the 4-biphenylmethyl radical
作者:Waldemar Adam、Katrin Schneider
DOI:10.1039/a606817k
日期:——
In laser-jet (LJ) photolysis (high intensity) of the ether
4-(4-benzoylphenoxymethyl)biphenyl 1 a two-photon process is observed in
CCl4 to yield 4-(chloromethyl)biphenyl 5 as product (3%),
while the one-photon product is 4-biphenylaldehyde 7 (100% in
conventional photolysis versus 97% in laser-jet
photolysis). In ethanol, the results suggest a three-proton reaction in
which 4-(ethoxymethyl)biphenyl 6 is produced in appreciable amounts
(18%) in addition to the one-photon product 1,2-bis(4-biphenyl)ethane 4,
the latter as the major product (82%). It is proposed that under
high-intensity LJ photolysis conditions the electronically-excited
4-biphenylmethyl radical 2* is photoionized to the 4-biphenylmethyl
cation 2+ and that the latter is trapped by ethanol to give
the 4-biphenylmethyl ether 6.