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49
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84891311725
-
-
note
-
3 = hydrogen) are shown in Table 5. (Table Presented)
-
-
-
-
50
-
-
84891298613
-
-
note
-
A 300 W tungsten lamp with a cut-off filter was used. Characteristics of the cut-off filter: λ> 620 nm, transmittance = 83%; λ< 585 nm, transmittance < 1%.
-
-
-
-
51
-
-
84891339249
-
-
note
-
A 300 W tungsten lamp with a window filter was used. Characteristics of the window filter: 425-475 nm, transmittance = 68%; λ< 400 nm and λ> 500 nm, transmittance < 3%.
-
-
-
-
52
-
-
84891330177
-
-
note
-
Standard UV lamps of the same total power of 6 W were used for visualizing TLC plates. In the case of compound 1b the monochromator of a fluorimeter was also used and irradiation at different wavelengths gave similar results (see ref. [13]).
-
-
-
-
53
-
-
84891341162
-
-
note
-
The high closing efficiency of compound 1a on exposure to daylight makes physicochemical studies of the open form difficult.
-
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54
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37049081463
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-
-
84891341927
-
-
note
-
3CN at wavelengths lower than 400 nm resulted in partial decomposition. For compound 2b closing was limited to 60-65% (15 min).
-
-
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56
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84891301594
-
-
note
-
Attempts to dry compound 13 led to loss of the boronic acid group.
-
-
-
-
64
-
-
84891326910
-
-
note
-
Since boronic acid 9 is very unstable, the addition of the solution must be carried out from the top of the condenser directly into the solution (to avoid warming the boronic acid before it reaches the reaction medium) and at a low addition rate (1-2 h).
-
-
-
-
65
-
-
37049068479
-
-
3 can combine with boronic acids under these reaction conditions
-
3 can combine with boronic acids under these reaction conditions (E. M. Campi, W. R. Jackson, S. M. Marcuccio, C. G. M. Naeslund, J. Chem. Soc. Chem. Commun. 1994, 2395-2395).
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Naeslund, C.G.M.4
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