2.4 Tetrazoles
25
Table 2.2 (continued)
Entry
Tetrazole
Method of
activation
λ max
(nm)
References
5
N
N
N
N
O
O
HO
5
Blue LED
420
[50]
6
N
N
N
N
O
O
O
OH
NH
O
O
O
2
fs Laser
700
[51]
7
N
N
N
N
O
O
HO
5
NIR laser,
UCNPs
974
[52]
substituents of the C-aryl ring were not found to significantly alter the yield, with
only substitution of the N-aryl ring found to have any significant impact. Analogous to Baldwin’s results in the thermolytic studies of tetrazole cleavage, electronwithdrawing groups were found to improve quantum yield [57]. This again suggests
that the photolysis of 2,5-disubstituted tetrazoles is non-symmetrical. Furthermore,
the lack of an effect on the QY by substitution of the C–aryl ring indicated a similar
25
Table 2.2 (continued)
Entry
Tetrazole
Method of
activation
λ max
(nm)
References
5
N
N
N
N
O
O
HO
5
Blue LED
420
[50]
6
N
N
N
N
O
O
O
OH
NH
O
O
O
2
fs Laser
700
[51]
7
N
N
N
N
O
O
HO
5
NIR laser,
UCNPs
974
[52]
substituents of the C-aryl ring were not found to significantly alter the yield, with
only substitution of the N-aryl ring found to have any significant impact. Analogous to Baldwin’s results in the thermolytic studies of tetrazole cleavage, electronwithdrawing groups were found to improve quantum yield [57]. This again suggests
that the photolysis of 2,5-disubstituted tetrazoles is non-symmetrical. Furthermore,
the lack of an effect on the QY by substitution of the C–aryl ring indicated a similar