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The synthetic method described in this paper involves the stannylation of 3-bromopyridine by trimethylstannylsodium in 87% yield
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0344197818
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note
-
Measurements in the absence of salt did not give the peaks due to the oligomers comprised of 3. Moreover, in acetone either in the presence or absence of lithium chloride, or in toluene in the absence of lithium chloride, 3 also did not give the assignable peaks by means of either positive or negative polarity mode.
-
-
-
-
36
-
-
0344197819
-
-
note
-
A very small amount of proton signals also consists of one set of the signals as a monomer.
-
-
-
-
37
-
-
0344629501
-
-
note
-
8, this signal would arise from a small amount of species such as a monomer or acyclic low molecular weight aggregates, which were free from the B-N coordination bond.
-
-
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38
-
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0344197817
-
-
note
-
As an alternative interpretation, a reviewer made a comment that more than one set of peaks may indicate a cyclic aggregate where the units are inequivalent. However, it appears that the concentration-and solvent-dependent NMR shifts as described in the section on NMR spectroscopy could not be explained by this interpretation.
-
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-
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39
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0345491676
-
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note
-
c, the interconversion should be fast enough to equilibrate them at room temperature.
-
-
-
-
40
-
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0344629500
-
-
note
-
2 proton as being on the inside.
-
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42
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0002579343
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0344197813
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In parentheses were shown the stabilization energy or THC value of another cyclic oligomer of two stable ones.
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48
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