Undecylenic carboxylic acids

Undecylenic acid has also been shown to react with the surface preferentially at the alkene end, leaving the terminal carboxylic acid group free for further reaction [53], This result was somewhat unexpected as the Si-H sites are considered to be somewhat acidic and the oxophilic nature of silicon should thermodynamically favor reaction with the hydroxyl group of the acid. The preferential reactivity with the alkenyl end is consistent with a free radical, rather than a nucleophilic mechanism. The acid function can be activated with N-hydroxy succinimide (NHS) to facilitate coupling with amine tagged molecules. Schematically,... 

Internal stabilization with lead undecylenate appears to be caused for similar reasons. As can be seen in Figure 9, the carbonyl band of the incorporated salt group (obtained from a KBr briquet sample of the copolymer) appears at 1540 cm.-1. The intensity of this absorption band decreases with time of heat treatment. At the same time a band appears at 1730 cm."1 which, in analogy to the investigations of Frye and Horst (10), is to be attributed to formation of ester groups in the polymers. Accordingly, there seems to be no basic difference between the stabilizing action of admixed and of chemically incorporated lead salts of aliphatic carboxylic acids. 

In order to confirm the reactivity and selectivity of lead ruthenates for the oxidation of isolated double bonds, two soluble, unsaturated carboxylic acids were chosen that contain a double bond far removed from the solubilizing carboxylate group. The two olefinic compounds, 1-undecylenic acid and 2-cyclopentene-l-acetic acid were both cleaved at the double bond as shown in Figure 13. 

The main advantage of this ointment is its low price. This combination has now been replaced by more active modem antimycotics. Long ago, the antimycotic effect of aliphatic carboxylic acids with an increasing number of C-atoms was discovered. The optimum is 11 C-atoms and CH2=CH(CH2)8COOH, undecylenic acid [112-38-9], C f I O, is used in several ointments. 

PEG-30 soy sterol PEG-40 soy sterol PEG-9 stearamide carboxylic acid PEG-2 stearamine PEG-5 stearamine PEG-10 stearamine PEG-15 stearamine PEG-50 stearamine PEG stearate PEG-2 stearate PEG-2 stearate SE PEG-3 stearate PEG-4 stearate PEG-5 stearate PEG-6 stearate PEG-7 stearate PEG-8 stearate PEG-9 stearate PEG-10 stearate PEG-12 stearate PEG-14 stearate PEG-18 stearate PEG-20 stearate PEG-23 stearate PEG-25 stearate PEG-32 stearate PEG-35 stearate PEG-36 stearate PEG-40 stearate PEG-45 stearate PEG-50 stearate PEG-55 stearate PEG-90 stearate PEG-100 stearate PEG-150 stearate PEG-2 stearmonium chloride PEG-4 tallate PEG-5 tallate PEG-6 tallate PEG-8 tallate PEG-9 tallate PEG-10 tallate PEG-12 tallate PEG-14 tallate PEG-15 tallate PEG-16 tallate PEG-20 tallate PEG-660 tallate PEG-5 tallow amide PEG-8 tallow amide PEG-50 tallow amide PEG-7 tallowamine PEG-11 tallowamine PEG-50 tallowamine PEG-3 tallow aminopropylamine PEG-10 tallow aminopropylamine PEG-15 tallow aminopropylamine PEG-2 tallowate PEG-20 tallowate PEG-15 tallow polyamine PEG-5 tricaprylyl citrate PEG-66 trihydroxystearin PEG-200 trihydroxystearin PEG-5 trimethylolpropane trimyristate PEG-6 undecylenate... 

PA/ABS-f-carboxylic acid Order in its place of reactivity in the melt was ABS-g- undecylenic acid > ABS-g-oleic acid > ABS-g-crotonic acid > ABS-g-acrylic acid Zhou et al. 2004... 

The sex pheromone structure, 10-methyl-2-tridecanone, was synthesized using the carboxyl group as the source of the methyl branch (lA) (Figure 6). Undecylenic acid was a-propylated and resolved via amides. The procedure followed allowed us to obtain the alcohols,(R)- and (S)-2-propyl-10-undecenol (>99.6% ee). The corresponding bromide was reduced with lithium triethylborohydride (15) then the double bond was converted to a methyl ketone by a) oxymercuration, b) reduction of the C-Hg bond with sodium borohy-dride, and c) oxidation with dichromate. The male southern corn rootworm responds only to the (R)-configuration no biological activity was noted for the (S)-enantiomer. Therefore, in this instance the racemic compound would be predicted to monitor this species adequately. 

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