Among the best methods for pyrazole synthesis is the condensation of 1,3- diketones with hydrazines in the presence of acids, such as hydrochloric acid , sulfuric acid  and polystyrene supported sulfuric acid .
Natarajan, 1,3- Diketones from Acid Chlorides and Ketones: A Rapid and General One-Pot Synthesis of Pyrazoles, Org.
One of the most important diketones
is diacetyle (butan-2, 3-dione) with sweet buttery and vanilla aroma.
Because diacetyl and 2,3-pentanedione, both diketones
, are chemically very similar, Morgan suspected that inhaled 2,3-pentanedione may be toxic to the respiratory tract as well.
Effects of plant antioxidants and natural vicinal diketones
on methane production, studied in vitro with rumen fluid and a polylactate as maintenance substrate.
Among the diketones
available, the most frequently used is camphorquinone (CQ).
In the light of the information referred to above we made an attempt to obtain diketones
2 and 3 directly from lactone 1 by hydroboration (Scheme 2).
reports that key company experiments have revealed the bridging effects of ligands, such as 1, 3 diketones
, that hold together different interacting metals, such as barium and zinc.
During the wort fermentation period, several reactions closely related to cytoplasmic membrane occur in yeast, among them are: nutrients uptake, metabolic by-products extrusion, respiratory activity, vicinal diketones
The samples of PVOH exposed to the Phanerochaete chrysosporium enzymes during 5 days showed deterioration, which implies changes in the chemical structures (oxidation or loss of small fragments) since in the UV signals show the possible formation of enolized [Beta] diketones
A MA model product with the diketone
structure but without curable group was also synthesized for the mechanistic study.