Propionaldehyde, 2-Hydroxy

Propionaldehyde, 3-(7 -benzo[fe]thiophenyl)-synthesis, 4, 906 Propionaldehyde, 3-hydroxy-... 

Dimethyl-3-hydroxypropanal EINECS 209-895-4 HSDB 5711 Hydracrylaldehyde, 2,2-dimethyl 3-Hydroxy-2,2-dimethyl-propionaldehyde 3-Hydroxy-2,2-dimethylpropanai ... 

Hydroxymethylmethyldiazirine (209 unprotonated) formed propionaldehyde as the sole product by thermal nitrogen extrusion 4-hydroxy-l,2-diazaspiro[2.5]oct-l-ene (218) formed a mixture of cyclohexanone (73%), cyclohexenol (21%) and cyclohexene oxide (5%). Thermal decomposition of difluorodiazirine (219) was investigated intensively. In this case there is no intramolecular stabilization possible. On heating for three hours to 165-180 °C hexafluorocyclopropane and tetrafluoroethylene were formed together with perfluorofor-maldazine 64JHC59). 

Hexadienal, 2383 t Hydrogen cyanide, 0380 4-Hydroxy-iranx-cinnamic acid, 3136 A-Hydroxymethylacrylamide, 1571 Methacrylic acid, 1530 I Methyl acrylate, 1531 I 2-Methylaziridine, Acids, 1257 I Methyl methacrylate, Propionaldehyde, 1915 3-Methyl-2-penten-4-yn-l-ol, 2384... 

Product inhibition in the glycerol fermentation has been studied in several investigations [12, 38,43-45]. The strongest inhibitor seems to be 3-hydroxy-propionaldehyde. This compound is normally an intracellular intermediate that does not accumulate. However, under conditions of high glycerol excess, it may be excreted into the medium. Whereas K. pneumoniae is able to reduce the accumulated 3-hydroxypropanal further to 1,3-PD, Enterobacter agglomerans is killed by the aldehyde as soon as a concentration of 2.2 g/1 has been reached [44], C. butyricum excretes only very small amounts of 3-hydroxypropanal [46]. 

AW-Dimethyl-Ot-isocyanoacetamide 10 is the substrate of choice in the reaction with acetaldehyde (98.6% ee) or primary aldehydes such as propionaldehyde (96.3% ee) or isovaler-aldehyde (97.3% ee) (Scheme 8B1.5, Table 8B1.5) [19]. The oxazolinecarboxamides 11 thus prepared can be converted to P-hydroxy-a-amino acids by acidic hydrolysis. The aldol reaction... 

Hydroxy-trart.v-cinnamic acid, 3130 /V-Hydroxymethyl acrylamide, 1566 Methacrylic acid, 1525 f Methyl acrylate, 1526 f Methyl methacrylate Propionaldehyde, 1909 f Methyl vinyl ether Acids, 1217... 

Apart from the large number of different a-keto acids which may be decarboxylated by PDC, only a few of the resulting aldehydes may be transferred to a second aldehyde molecule to form an a-hydroxy ketone [151]. Besides acetaldehyde, which is the best acylanion equivalent, propionaldehyde and butyraldehyde have been condensed to benzaldehyde by baker s yeast after decarboxylation of the corresponding a-keto acids [116,149]. 

A mixture of 288 g (4 mols) of isobutyraldehyde, 288 g of methanol was cooled to 10°C and 170 g (2 mols) of 36.6% formalin containing 8.5 g (3% based on isobutyraldehyde) of sodium hydroxide was added dropwise over a 55 minute period to produce alpha,alpha-dimethyl-beta-hydroxy-propionaldehyde. The mixture was stirred for an additional 2 hours at 10-15°C and then contacted with acetic acid to neutralize the catalyst. The excess isobutyraldehyde and methanol were stripped off at a kettle temperature of 50°C at 25 mm. To the residual a,a-dimethyl-beta-hydroxypropionaldehyde a mixture of 260 ml of methanol and 2 g (0.75%) sodium cyanide was added and the solution cooled to 10°C before adding 59.4 g (2.2 mols) of hydrogen cyanide dropwise over a 35 minute period to produce a,y-dihydroxy-p,p-dimethylbutyronitrile. The mixture was stirred at 10°C for one hour period and then contacted with acetic acid to neutralize the catalyst before stripping off the excess methanol to a kettle temperature of 45°C at 18 mm. The crude cyanohydrin was then hydrolysed by heating with 4 mols of concentrated hydrochloric acid at 80°C for 2 hours, then diluting with an equal volume of water and heating at 100°C for an additional 8 hours. The aqueous mixture was extracted continuously with ethylene dichloride. The solvent was... 

Self-aldolization of acetaldehyde provided one-step enantioselective syntheses of (5R)- and (5S)-Hydroxy-(2E)-hexenal using either (R) or (S)-proline as catalysts of the homologation of three acetaldehyde units ee-values of up to 90% were obtained [25]. Using this methodology, a series of triketides was prepared by slow addition of propionaldehyde into acceptor aldehyde and (S)-proline in DMF, and the isolated lactols were converted to the corresponding d-lactones [26]. The product enantiomeric purity was typically moderate because of the isomerization... 

Acetyl chloride acephate, azaconazole, chlorfenvinphos, cyhalotrin, dimethomorph, dinoseb acetate, fenitropan, fluxofenim, furconazole, mefluidide, propiconazole Acetyl chloride (dichloro) see dichloro Acetyl chloride phenyl carbinol bromadiolone Acetylene aldrin, 2,4 DB Acetyl hydrazine metamitron Acetylide (sodium) pronamide Acetyl magnesiun bromide empenthrin Acetyl morpholine dimethomorph Acetyloxy propionaldehyde furmecyclox Acrolein 8 hydroxy quinoline sulfate Acrylic acid propaquizafop Acryloyl chloride propaquizafop Acrylonitrile fenpiclonil, fludioxonil, nipyraclofen Aldrin dieldrin, endrin... 

C4C14S tetrachlorothiophene 6012-97-1 1.102E-K10 79.800 3535.2 C4H802 3-hydroxy-2-methyl propionaldehyde 38433-80-6 7.870E+09 53.860... 

An aldol condensation (selectivity 100 1) between e reagent 106a (produced from optically active mandelic acid), known to induce (f ) chirality, and propionaldehyde, followed by desilylation and oxidative cleavage of the resulting a-hydroxy ketone gave the p-hydroxy acid 107 in 85% yield. Esterification, silylation, and a reduction-oxidation sequence then afforded a 75% overall yield... 

Scheme 6.24 Schematic illustrating the self-condensation of propionaldehyde (87) to afford 3-hydroxy-2-methylpentenal (90) and the dehydration product 2-methylpentanal (88).

Hydrogenation of propionaldehyde, catalyzed by various ruthenium-TPPTS complexes, was dramatically influenced by the addition of certain salts [122, 123]. Whereas in the absence of salts there was no reaction at 35 °C and 50 bar H2, in the presence of Nal TOFs of more than 2000 h 1 were determined. This was lowered to 300 h-1 when the sodium cation was selectively sequestered by a cryptant (4,7,13,16,21-pentoxa-l,10-diazabicyclo[5.8.8]tricosane). Obviously, the larger part of the salt effect belonged to the cation. It was concluded that electrophilic assistance by Na+ facilitated C-coordination of the aldehyde and formation of a hydroxy-alkyl intermediate. 

A thixotropic starch was produced in reactions of POCl3-crosslinked starch with unsaturated aliphatic aldehydes.1361 Starch phosphates have been crosslinked by various aliphatic and aromatic aldehydes in the presence of urea, melamine, and similar compounds. Among several aldehydes tested[formaldehyde, propanal (propionaldehyde), glyoxal, glutaraldehyde, 2-hydroxyadipaldehyde (2-hydroxy -1,6-hexanedial), and some aromatic aldehydes], only those products that had reacted with glyoxal were insoluble in water.1322 Significant increases in viscosity occurred after starch phosphates having a low DS were treated with urea.1590... 

On the basis of the metabolic products identified and their relative amounts formed during incubation, a degradative pathway involving hydroxylation and sulfoxidation mechanisms is proposed (Figure 7). EPTC is first hydroxylated at the a-propyl carbon to form a-hydroxy-propyl EPTC. This compound is unstable and breaks down to form N-depropyl EPTC and propionaldehyde. The N-depropyl EPTC is further metabolized to s-ethyl formic acid and propylamine. The s-ethylcarboxylic acid is then demethylated to s-methyl formic acid. This product is hypothesized to degrade to form C02 and methyl mercaptan. 

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