نتایج جستجو برای: dehydroacetic acid
تعداد نتایج: 747443 فیلتر نتایج به سال:
The typical locomotion of ascaris was found and studied by Kobayashi and Bando (1950) in a glass-tube of the appropriate diameter filled with Ringer or Bunge's solution. They also observed that santonin in vitro did not influence on survival-length of ascaris, but induced a spasmodic curling around the body of ascaris which seemed to be a kind of convulsion caused by the drug. It was supposed t...
Synthesis and phytotoxic activity of new pyridones derived from 4-hydroxy-6-methylpyridin-2(1H)-one.
Commercial dehydroacetic acid was converted into 4-hydroxy-6-methylpyridin-2(1H)-one (3), which was then condensed with several aliphatic aldehydes to produce seven new title compounds in variable yields (35-92%). Reaction of 3 with alpha,beta-unsaturated aldehydes resulted in the formation of condensed pyran derivatives 4g' and 4h'. A mechanism is proposed to explain the formation of such comp...
An Investigation for Color Reaction of Dehydroacetic Acid and Related Compounds with Salicylaldehyde
Several phenylenediamine derivatives of dehydroacetic acid, 3-acetyl-4-hydroxy-6-methyl-2Hpyran-2-one have been synthesized and their structure elucidated by using NMR and IR spectroscopies and mass spectrometry. Spectral analyses have pointed toward the localized keto-amine form as the predominant tautomeric form in solution and solid-state which was in agreement with X-ray data. The relativel...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید