propanal


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pro·pa·nal

 (prō′pə-năl′)
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Noun1.propanal - a colorless liquid aldehyde
aldehyde - any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids
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Six different aldehydes, which include propanal, butanal, 3-methyl butanal, 2-methyl butanal, pentanal and hexanal, were produced from the nondairy creamers analogs/mimics.
[13] model, the model and the experimental data showed good agreement with the autoignition characteristics; however, there were some deviances for the expected amounts of propanal. The results for trans-3-hexene were especially troubling, as the model overpredicted the propanal production by a factor of ten.
The other HAPs in the plywood composite wood products and Maximum Achievable Controlled Technology standards that would be of concern at the dryers and presses include acetaldehyde, acrolein, phenol, and propanal.
Among the substances inhaled by an e-smoker, researchers have identified several harmful products including: formaldehyde, acetaldehyde, acroleine, propanal, nicotine, acetone, o-methyl-benzaldehyde, and carcinogenic nitrosamines [10,14,15].
Samples were taken to determine the oil stability by detecting the propanal formation every 15 days.
It entails comprising coexistence between at least one compound selected from the group consisting of the following compounds: oxacyclohexadecen-2-one; 1-(2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulen- 5-yl)-ethanone; 2-benzylideneheptanal; 3-(4-tert-butylphenyl) propanal; (5E)-3-methylcyclopentadec-5-en-1-one; 1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthalenyl)-ethanone; and 7-acetyl-1,2,3,4,5,6,7,8-octahydro-1,1,6,7-tetramethyl-naphthalene, and an odor caused by sotolone.
Furthermore, an increased amount of sinapic acid is reported to produce less quantity of propanal (secondary oxidation product) at low tocopherol concentration and larger quantity at high levels.
Dadas las pocas mediciones a nivel nacional y por la importancia de este tipo de sustancias, este estudio tuvo como objetivo determinar la concentracion del formaldehido, el acetaldehido, el propanal, el butanal, el hexanal y el heptanal, en el aire de la Reserva Biologica Monteverde y del Campus Omar Dengo de la Universidad Nacional, durante la epoca seca y transicion a la epoca lluviosa, debido a que tales lugares representan una zona boscosa y una zona urbana y, asi, comparar los dos escenarios.
Later, pre paration of the Fmoc-protected aza-arginine precursor was accomplished according to Scheme 1A, using reductive amination of 3-([N.sup.[omega]],[N.sup.[omega]]-di-Boc-guanidyf) propanal with Fmoc hydrazine, while the required carbonyl compound was prepared by guanylation of 3-amino-propanol with N,N'-bis-Boc-S-methylisothiourea, followed by oxidation with the Dess-Martin reagent [12].
hemipterus Compounds Concentration Attraction index (ppm) Nymph Female Male Aldehydes 25 -0.15 +0.44 -0.72 (E)-2-hexenal 50 +0.56 +0.64 +0.3 100 +0.78 +0.78 +0.72 150 +0.66 +0.77 +0.56 (E)-2-hexenal 100 -0.33 -0.18 -0.028 150 -0.39 -0.08 -0.034 200 -0.10 +0.29 +0.006 250 -0.38 +0.16 -0.74 Hexanal 12.5 +0.16 +0.21 +0.18 25 +0.29 +0.29 +0.31 37.5 +0.60 +0.67 +0.63 50 -0.07 -0.38 -0.25 3-methylthio- 50 -0.20 -0.09 -0.41 propanal 100 -0.31 +0.05 -0.57 (E)-2-octenal 2.5 -0.48 +0.36 -0.65 15 -0.57 -0.79 -0.51 Acetaldehyde 50 -0.47 +0.48 +0.43 100 -0.14 -0.47 +0.29 Benzaldehyde 50 -0.44 +0.38 -0.54 100 -0.46 +0.46 -0.26 Table 3.
Urushima e colaboradores investigaram a reacao de Mannich enantiosseletiva quando V-Ts iminas 250 e propanal 251 sao utilizados com diarilprolinol silil eter contendo substituintes trifluorometil 252 como catalisador e NaHC[O.sub.3] em diversos solventes, seguido por uma dessulfonilacao numa reacao domino.
thermosphacta en carne de res en cargas de [10.sup.7] UFC [cm.sup.-2] produce acetoina, diacetyl butanal y propanal, compuestos asociados con el olor a "queso" o "mantequilla".