Smirnov, E. A. published the artcileStructure and color of salicylideneaniline derivatives containing substituents in the aldehyde component, Recommanded Product: 5-Bromo-3-chloro-2-hydroxybenzaldehyde, the publication is Doklady Akademii Nauk SSSR (1968), 179(2), 358-61, database is CAplus.
The tabulated I were prepared by heating the substituted salicylaldehyde with PhNH2 in PrOH and crystallized from the solvent shown. 3,5,2-BrCl(HO)C6H2CHO, m. 102.5-3.5° (CCl4), and its 5,3,2-isomer, m. 86° (CCl4), were prepared by halogenation of the corresponding 5-substituted salicylaldehyde in AcOH. The colors listed in the table were shown by the powd. compound on white paper. The absorption spectra of these powders were also obtained. [TABLE OMITTED] The introduction of halogen or NO2 shifts the absorption of the I (R3 = H) (II) into the visible region and increases it, whereas the substituents have little effect on the absorption spectra of I (R3 = Me). Evidently, the substituents promote structure IIb. In HCONMe2 solution unsubstituted or monohalogenated II have λmax. at 272 and 339 mμ, but disubstituted II show λmax. in the visible region, with II (R1 = NO2, R2 = Br; R1 = H, R2 = NO2; or R1 = NO2, R2 = H) showing 2 such maximum
Doklady Akademii Nauk SSSR published new progress about 19652-33-6. 19652-33-6 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Bromide,Benzene,Phenol,Aldehyde, name is 5-Bromo-3-chloro-2-hydroxybenzaldehyde, and the molecular formula is C7H5Br2F, Recommanded Product: 5-Bromo-3-chloro-2-hydroxybenzaldehyde.
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