Propionic 3-hydroxy-3-phenyl-, ethyl ester

It is interesting to note that in fermented products the same alcohols always form, even if different sources of nitrogen, but not singular aminoacids, are available. Ketoacids can also be directly reduced to hydroxyacids such as lactic, 2-hydroxy-3-methyl butyric, 2-hydroxy-3-methyl pentanoic, 2-hydroxy-4-methyl pentanoic, 2-hydroxy-3-phenyl propionic and 2-hydroxy glutaric acids. The corresponding ethyl esters can dramatically influence the wine aroma. 

C11H14O3 3-hydroxy-3-phenyl-propionic acid ethyl ester 5764-85-2... 

The Reformatsky Reaction consists of the interaction of an ester of an a-halogeno-acid with an aldehyde, a ketone or another ester in the presence of zinc. For example, if a mixture of ethyl bromoacetate and benzaldehyde is heated with zinc, the latter undoubtedly first combines with the ethyl bromoacetate to form a Grignard-like reagent (reaction A), which then adds on to the benzaldehyde Just as a Grignard reagent would do (reaction B). The complex so formed, on acidification gives ethyl p-phenyl-p-hydroxy-propionate (reaction C). Note that reaction A could not satisfactorily be carried out using... 

In order to clarify the proposed mechanism, the reduction of ethyl 3-oxo-3-phenyl propionate was carried out, resulting in the exclusive formation of the (S)-enantiomer confirming the presence of (S)-specific reductase. When the pure (S)-enantiomer was used as the substrate for deracemization, the product recovered retained the configuration as well as the optical purity without any loss, clearly supporting the presence of an (S)-specific reductase, which does not oxidize the (S)-hydroxy ester to the corresponding keto ester. 

Stabilizers UVA 2-hydroxy-4-octyloxybenzophenone 2-(2H-benzo-triazol-2-yl)-6-dodecyl-4-methylphenol, branched linear propanedioic acid, [(4-methoxyphenyl)-methylene]-dimethyl ester HAS 1,3,5-triazine-2,4,6-triamine, N,N [1,2-ethane-diyl-bis[[[4,6-bis[butyl(1,2,6,6-pentamethyl-4-piperidinyl) amino]-1,3,5-triazine-2-yl]imino]-3,1 -propanediyl]bis[N, N -dibutyl-N ,N -bis(1,2,2,6,6-pentamethyl-4-piperidinyl)- poly[[(6-[1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl] [2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[2,2,6,6-tetramethyl-4-piperidinyl)imino]] 1,6-hexanediamine- N,N -bis(2,2,6,6-tetramethyl-4-piperidinyl)-polymer with 2,4,6-trichlo-ro-1,3,5-triazine, reaction products with N-butyl-1-butanamine an N-butyl-2,2,6,6-tetramethyl-4-piperidinamine butanedioic acid, dimethylester, polymer with 4-hydroxy-2,2,6,6-tetrameth-yl-1-piperidine ethanol Phenolic antioxidant pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) Amine benzenamine, N-phenyl-, reaction products with 2,4,4-trimethylpentene Optical brightener 2,2 -(1,2-ethyl-enediyldi-4,1-phenylene)bisbenzoxazole, C.I.F.B. 367 ... 

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