Aldehyde propionic

Aldol reaction of campholenic aldehyde with propionic aldehyde yields the intermediate conjugated aldehyde, which can be selectively reduced to the saturated alcohol with a sandalwood odor. If the double bond in the cyclopentene ring is also reduced, the resulting product does not have a sandalwood odor (161). Reaction of campholenic aldehyde with -butyraldehyde followed by reduction of the aldehyde group gives the aHyUc alcohol known commercially by one manufacturer as Bacdanol [28219-61 -6] (82). 

Chemical Designations - Synonyms Melhylacelaldehyde Propaldehyde Propanal Propionic aldehyde Propylaldehyde Chemical Formula CHjCHjCHO. 

Metriol (Pentaglycerol, 2-(Hydroxymethyl)-2-me thy 1-1,3 -p rop ane diol, Methyltrime thylol-methane). H3C.C(CH2OH)3 mw 120.15 white needles from abs ale mp 199° (sublimes without decompn). Was first prepd by Hosaeus (Ref 2) by condensing formaldehyde and propionic aldehyde in cold aq soln in the presence of lime. Metriol is v sol in w, ale and acet ac is insol in eth. It may be nitrated to an expl trinitrate, and acetylated to a nonexpl triacetate Refs 1) Beil 1, 520 2) H. Hosaeus, Ann... 

On reacting aldehydes such as propionic aldehyde, however, with a 1 1-mixture of a silylated allyl- or benzyl alcohol such as 589 and phenylthiotrimethylsilane 584 in the presence of TMSOTf 20 0,S-acetals such as 591 are obtained, via the probable intermediate 590, in high yields [63]. The a-ketoamide 592 is converted by methylthiotrimethylsilane 593/F3B-OEt2 into the bisthioketal 594 in 81% yield [145]. Ethylenethioketals such as 595 are cleaved by MesSiBr 16 or Me3SiI 17 in... 

Plant extracts rich in carotenoids, hydrolyzed with acetic and propionic aldehydes under controlled temperature and pressure... 

The various thermal techniques give different results. Snee (1991) determined the heat of the esterification reaction between sec-butanol and propionic aldehyde using different thermal techniques. 

The selective inclusion properties of 40 (Table 6) offer several possibilities of compound separation which are of interest in analytics and for preparation purposes37). The separation of methanol from a mixture with ethanol, or of propionic aldehyde from propionic acid, or of 2-chloropropionic acid from propionic acid or lactic acid, etc., are a few examples. 

Propene Propene Oxide Propene Polymer Propenoic Acid Beta-Propiolactone Propionaldehyde Propionic Acid Propionic Aldehyde Propionic Anhydride Beta-Propionolactone Propionyl Oxide N-Propyl Acetate 2-Propyl Acetate Propyl Alcohol... 

PROPIONALDEHYDE Propyl aldehyde, Propaldehyde, Propanal, Propionic aldehyde Flammable Liquid, II 2 3 1 ... 

It seems likely that the major proportion of C2H40 is formed from C2H4 rather than C2H5 radicals, and this view is confirmed from studies where C2H4 has been used as the additive and from analysis data for propion-aldehyde oxidation at 440°C. where C2H4 and CH3CHO are primary products, but the concentration profile for C2H40 is distinctly autocata-lytic in character (8). The same conclusion has been reached by Knox and Wells (15). 

Propion- aldehyde n-Propyl Alcohol Acrolein Allyl Alcohol Acetone Isopropyl Alcohol... 

At higher pressures of ether the reaction is unimolecular in the sense that the time required for any given fraction of the total change is independent of the initial pressure. Below about 150 mm., however, the time increases very considerably, that is to say the velocity constant falls, a behaviour exactly similar to that of propionic aldehyde. In the presence of hydrogen the constant retains its normal value at lower pressures. Helium and other inert gases do not exert this influence in maintaining the constant at its normal value. It should be remarked that the constant cannot be raised above its normal value by the presence of any amount of hydrogen. 

The constant for the decomposition of gaseous propionic aldehyde falls away steadily below about 80 mm., that for the decomposition of diethyl ether below about 150 mm., that for the decomposition of diethyl ether below about 300 mm. Several other ethers, dipropyl ether, methyl propyl ether and methyl ethyl ether behave in a similar manner. The velocity constant for the decomposition of azomethane also diminishes but not until lower pressures are reached for example at 290° C. k at 0-259 mm. has one-fourth of its value at 707-9 mm. In several reactions, such as the racemization of pinene, and the decomposition of gaseous acetone the falling off of the velocity constant has not actually been looked for. The decomposition of azoisopropane is unimolecular down to pressures of 0-25 mm. 

To account for the behaviour of propionic aldehyde about 12 terms are needed, for diethyl ether 8, and for azomethane about 25. 

T rin itrobutanol, H3C.CH .CH(OH).C-(N02)2< The prepn of this compd from propion aldehyde nitrofotm was reported in Ref 2. Later it found(Ref 3), that the compd was actually metbyUl, 1, Utrinitrc 2-butyl ether,... 

The Influence of Substituents. The substituents at the groups indicated have a markedly smaller effect on z and t. This is evidence for the orientation of the molecules with their reacting atoms toward the catalyst (Fig. 13), as is required by the theory. The influence is particularly slight in the case of metals. For hydrocarbons (Nos. 1-3), amines (23-29), and alcohols Z — 1 and z3 = 0. From a crisscross examination of the data of Nos. 40-47, it can be seen that in the case of copper not only the values of z2 but also those of a2 are practically the same for ethyl, n-propyl, isopropyl alcohols, acet- and propionic aldehydes, and also acetone. This was explained by the author (66) in a treatment of the above-mentioned model from the standpoint of statistical mechanics. It was found that... 

Figure 7.4 Temperature dependence of propylene oxidation product yield. C3H6 20% H202 = 1 1 vCH = 800ml/h t = 1.86 s (1 propylene oxide 2 propionic aldehyde 3 allyl alcohol 4 acetone and "5 total propylene conversion).

Propionic aldehyde and acetone formation can be represented by the two mechanisms shown in Figures 7.14 and 7.15. As follows from these mechanisms of the catalytic act, with... 

Figure 7.14 The mechanism of propionic aldehyde synthesis at propylene oxidation with hydrogen peroxide on PPFe3+0H/Al203 catalyst.

It is common knowledge that propylene oxide is isomerized to propionic aldehyde in the presence of aluminum oxide in the temperature range between 250 and 260 °C [76], This is... 

Fig. 13.17. Highly "Z"-selec-tive generation of ester enolates in a THF/DMPU solvent mixture (DMPU, /V,/V -dimethyl-propyleneurea). The transition state A of this deprotonation with a metal-free diisopropy-lamide anion (in solution) corresponds to the calculated transition state B of the deprotonation of propionic aldehyde with a hydroxide anion (in the gas phase).

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