Nonanoate, methyl

Long-chain esters of pentaerythritol have been prepared by a variety of methods. The tetranonanoate is made by treatment of methyl nonanoate [7289-51-2] and pentaerythritol at elevated temperatures using sodium phenoxide alone, or titanium tetrapropoxide in xylene (12). PhenoHc esters having good antioxidant activity have been synthesized by reaction of phenols or long-chain aUphatic acids and pentaerythritol or trimethyl olpropane (13). 

Fig. 2-1 Proposed structures of three macrocycUc glycopeptides. On teicoplanin, R = 8-methyl-nonanoic acid.

One of the most important characteristics of IL is its wide temperature range for the liquid phase with no vapor pressure, so next we tested the lipase-catalyzed reaction under reduced pressure. It is known that usual methyl esters are not suitable for lipase-catalyzed transesterification as acyl donors because reverse reaction with produced methanol takes place. However, we can avoid such difficulty when the reaction is carried out under reduced pressure even if methyl esters are used as the acyl donor, because the produced methanol is removed immediately from the reaction mixture and thus the reaction equilibrium goes through to produce the desired product. To realize this idea, proper choice of the acyl donor ester was very important. The desired reaction was accomplished using methyl phenylth-ioacetate as acyl donor. Various methyl esters can also be used as acyl donor for these reactions methyl nonanoate was also recommended and efficient optical resolution was accomplished. Using our system, we demonstrated the completely recyclable use of lipase. The transesterification took place smoothly under reduced pressure at 10 Torr at 40°C when 0.5 equivalent of methyl phenylthioacetate was used as acyl donor, and we were able to obtain this compound in optically pure form. Five repetitions of this process showed no drop in the reaction rate (Fig. 4). Recently Kato reported nice additional examples of lipase-catalyzed reaction based on the same idea that CAL-B-catalyzed esterification or amidation of carboxylic acid was accomplished under reduced pressure conditions. ... 

Preliminary mechanistic studies on the methoxycarbonylation of 1-octene showed that two pathways to methyl nonanoate occur, one involving the direct carbonylation of 1-octene to the linear ester, the other the alkene isomerisation in competition with the first one. Subsequently, the linear product forms by tandem isomerisation of the internal alkenes, with the terminal alkyl intermediate being trapped by migration to CO at a higher rate than any branched alkyl species. This has been confirmed by the analysis of products... 

Ethyl butanoate Methyl hexanoate Methyl nonanoate Methyl 3-methylbutanoate Methyl 2-methylpropanoate Ethyl 3-acetamidobutanoate (70) Methyl 5-acetamidohexanoate (42) Methyl 4-acetamidohexanoate (11) Methyl 8-acetamidononanoate (25) Methyl 3-acetamido-3-methylbutanoate (68) Methyl 2-acetamido-2-methylpropanoate (58) Methyl 3-acetamidobutanoate (4)... 

When 1-chlorooctane was treated in this manner at 100°, the product (35% conversion) -was about a 5 1 mixture of methyl nonanoate and methyl 2-methyloctanoate, respectively. The authors suggest that the rearrangement conceivably proceeds in a manner somewhat analogous to that represented by Eq. (16). 

The fruity-sweet flavours in elderberry juice and products have primarily been associated with aliphatic esters such as ethyl 2-methylbutanoate, ethyl 3-methylbutanoate, methyl heptanoate, methyl octanoate, methyl nonanoate, alcohols (2-methyl-l-propanol, 2-methyl-1-butanol and 3-methyl-1-butanol) and the aldehydes pentanal, heptanal and octanal [127, 129, 130, 132],... 

C10H19F trans-1 -fluoro-1 -decene 66291-50-7 229.03 24.938 2 21063 C10H2002 methyl nonanoate 1731-84-6 211.58 18.677 2... 

Esterification." For the preparation of methyl nonanoate the charge of nonanoic acid, methanol, and coned, sulfuric acid is placed in a flask fitted with a thermometer... 

Deuterium-labeUng studies have shown in this case, as with the ketones, that one hydrogen atom is specifically transferred from the y-position. The y,Y-dimethyl derivative of methyl nonanoate does not give the odd-electron ion (Equation 2.61). 

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