New method of synthesis of polyene ketones with conjugated double bonds was written by Samokhvalov, G. I.;Miropol’skaya, M. A.;Preobrazhenskii, N. A.. And the article was included in Doklady Akademii Nauk SSSR in 1956.Recommanded Product: 827-24-7 This article mentions the following:
Alcs. of propargyl type react with diketene yielding esters of acetoacetic acid, whose Raman spectrum shows a triple bond line (2112 cm.-1) indicating no reaction at the terminal link. Heating to 160-70鎺?eliminates CO2 and yields unsaturated ketones. Condensation of 6-methyl-2-heptenone with C2H2 in Na-liquid NH3 gave 74% 3,7-dimethyloct-6-en-1-yn-3-ol, b6 83-4鎺?nD20 1.4622, d20 0.8861. This with diketene in the presence of a little Na gave 72% Me2C:CHCH2CH2CMe(C椤氬挵H)O2CCH2Ac, b0.2 93-4鎺? nD20 1.4665, d20 0.9879. This heated in N stream to 160-70鎺?3 hrs. gave 61% pseudoionone, b0.1 90-2鎺? absolute maximum 290 m娓? 2,4-dinitrophenylhydrazone, m. 134-6鎺? Fractionation of the latter gave mainly the geometric isomer, m. 147.5-48鎺? and only traces of isomer, m. 119鎺? The isomer found in major amounts corresponds to the structure of geranial form of citral. In the experiment, the researchers used many compounds, for example, 2-Bromo-4-methyl-6-nitroaniline (cas: 827-24-7Recommanded Product: 827-24-7).
2-Bromo-4-methyl-6-nitroaniline (cas: 827-24-7) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Recommanded Product: 827-24-7
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary