Derivatives of pyridine. VII. Strength of union of quinquevalent arsenic in the pyridine nucleus was written by Binz, A.;Roth, C.;Maier-Bode, H.. And the article was included in Justus Liebigs Annalen der Chemie in 1930.Product Details of 13472-81-6 This article mentions the following:
The following solubilities are reported (g. in 100 cc. H2O, temperature not given): 2-pyridone-5-arsonic acid (I) 1.5; Na Salt (II), needles, 51; di-Na salt (III), 37.7; 2-hydroxypyridine-5-arsonic acid (IV), 2; Na Salt (V) 20; di-Na salt (VI), 28.60. On heating 1/200 mol. with 20 cc. H2O in a bomb tube at 170闂? the following % As are split off in 8 hrs.: I 13.6; II 10.5; III 87.6; IV trace; V trace; VI 11; data are also given for 150闂?and for 2 and 4 hrs. heating. I (11 g.) and 16 g. Br in dilute AcOH give 8 g. 3,5-dibromo-2-pyridone, m. 207闂? IV, however, adds Br with difficulty and from 11 g. there was obtained only 1 g. of impure Br derivative Nitration of IV in H2SO4 gives 21% of the NO2 derivative obtained from I in 75% yields. The filtrate contains about the same amount of 3-nitro-2-hydroxypyridine-5-arsonic acid, does not m. 250闂? 5-Iodo-2-pyridone and K3AsO3 with CuSO4 in KOH, heated 20 hrs., give 30% of I. Similarly, 3-bromo-5-iodo-2-pyridone gives 25% of the 3-br derivative of I, also obtained by direct bromination of I. In the experiment, the researchers used many compounds, for example, 3,5-Dibromo-2-hydroxypyridine (cas: 13472-81-6Product Details of 13472-81-6).
3,5-Dibromo-2-hydroxypyridine (cas: 13472-81-6) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ闁荤姾娅ｅΛ纭俵闂? in pyridine vs. 150 kJ闁荤姾娅ｅΛ纭俵闂? in benzene). Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Product Details of 13472-81-6