1,2-Diacetyl ethane

Di acetophenone Diperoxide. See Aceto-phenoneperoxlde, Dimeric A48-R 1,9-Di acetoxy-2-acetyl-4,6,8-trinitro-2,4,6,8-cetrazanone or H-16. See under Acetyl-diacetoxytetrazanonane A57-R 1,2-Diacetyl ethane. See A cetoayl acetone A46-R... 

The diacetylated ethane-1-hydrox-1,1-diphosphonic acid is prepared by dissolving the diphosphonic acid in acetic acid and adding acetic anhydride [114]. The sodium salt can be directly converted to the free acid form by passing it through an hydrogen cation exchanger. The bicyclic dimer is prepared by basic hydrolysis of diacetylated cyclic dimer, as shown in Eq. (70) ... 

Metabolic products of lactic acid bacteria, such as diacetyl, ethanal, dimethylsulfide, acetic acid and lactic acid contribute to this aroma. Carbon dioxide also appears to be inqtortant. In good... 

Methane, ethene, ethane, propene, acetaldehyde, methyl formate, butene, acetone, furan, dimethyl sulfide, isoprene, isobu-tyraldehyde, diacetyl, methylfuran, and isovaleraldehyde... 

Diacetyl, acetoin and 2,3-butanediol These compounds are produced by condensing of pyruvate with ethanal. This reaction produces acetolactate which is later decarboxylated. Diacetyl is produced if the decarboxylation is oxidative, whereas acetoin is produced if the decarboxylation is not oxidative. Acetoin can also be formed by directly reducing diacetyl. Finally, acetoin can be reduced to form 2,3-butanediol. This last reaction is reversible (Ribereau-Gayon et al. 2000c). Acetoin and especially diacetyl give off a buttery smell that may... 

The most significant role of 2,3-butanediol is in maintaining an oxidation-reduction balance with acetoin (or acetylmethyl carbinol) and diacetyl (Figure 2.7). This compound (2,3-butanediol) is formed following the reduction of acetoin, produced by the condensation of two ethanal molecules. 

Ethane-tetracarboxylic ester—Ethane-hexacarboxylic ester— Tetracetyl-ethane — Diacetyl-succinic ester — Dimethyl-ethane-tetracarboxylic ester — Diethyl-ethane-tetracar-boxylic ester—Diacetyl-succinic ester.-.42-43... 

Two diacetyl synthesis pathways have been proposed. In one, diacetyl results from the reaction of acetyl CoA with ethanal-TPP (active acetaldehyde), catalyzed by a diacetyl synthetase, which has never been isolated. The other pathway supposes that from two pyruvate molecules, a-acetolactate synthetase produces a-acetolactate which is then decarboxylated into acetoin. The diacetyl is derived from it by oxidation. This is an aerobic pathway. 

CO, CH4, CO2, ethylene, acetylene, ethane, H2O, propylene, ethanal, 192 acetone, propanal, ethanol, benzene, toluene, ethyl benzene, styrene, p-vinyl toluene, benzaldehyde, p-ethyl toluene, acetophenone, methyl benzoate, vinyl benzoate, ethyl benzoate, p-methyl acetophenone, benzoic acid, p-methyl vinyl benzoate, p-vinyl acetophenone, propyl benzoate, p-ethyl vinyl benzoate, p-vinyl vinyl benzoate, biphenyl, 1-hydroxy ethyl benzoate, diacetyl benzene, p-acetyl vinyl benzoate, divinyl terephthalate, ethyl vinyl terephthalate,... 

Few 14-membered tetraphosphorus macrocycles 29 and 30 (Scheme 12.12) were obtained via addition reactions of bis(secondaryphosphino)ethanes and -propanes coordinated on the square templates (Ni(II), Pd(II) and Pt(II)) with 1,3-dicarbonyl (acetylacetone, malonodialdehyde) and 1,2-dicarbonyl (diacetyl, dibenzoyl) compounds correspondingly. The complexes of macrocycles were... 

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