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6,705 Newest Publications about the topic esters

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Effect of carbonyl-containing compounds on the dynamics of ripening of viscose

18-Aug-2009 | O. V. Khoroneko, B. E. Geller, Fibre Chemistry, 2009

The effect on the dynamics of ripening of viscose in the presence of carbonyl-containing compounds: hexamethylenetetramine (urotropin), sodium sulfoxylate (Rongalite C), and dimethylolurea, was investigated. A hypothesis was advanced concerning the possibility of formation of mixed cellulose ...

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Hydroxycinnamates in lignification

11-Aug-2009 | John Ralph, Phytochemistry Reviews, 2009

Hydroxycinnamates incorporate into lignins by various mechanisms. The polysaccharide esters of ferulate, in particular, and the range of dehydrodiferulates and higher oligomers in grasses, participate in free-radical (cross-)coupling reactions during lignification to become integrally bound into ...

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Chemistry and occurrence of hydroxycinnamate oligomers

25-Jul-2009 | Mirko Bunzel, Phytochemistry Reviews, 2009

Hydroxycinnamates such as ferulic acid, sinapic acid and p-coumaric acid ester-linked to plant cell wall polymers may act as cross-links between polysaccharides to each other, but also to proteins and lignin. Although sinapates and p-coumarates also form cell wall cross-links by the formation of ...

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Energies, Vol. 2, Pages 362-376: Transesterification of Vegetable Oils with Ethanol and Characterization of the Key Fuel Properties of Ethyl Esters

05-Jun-2009 | Anastopoulos, George ; Zannikou, Ypatia ; Stournas, Stamoulis ; Kalligeros, Stamatis, Energies, 2009

The transesterification reactions of four different vegetable oils (sunflower, rapeseed, olive oil and used frying oil) with ethanol, using sodium hydroxide as catalyst, were studied. The ester preparation involved a two-step transesterification reaction, followed by purification. The effects of ...

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Terminal double bonds in the alkenes and acetates of defensive secretion from the thrips Suocerathrips linguis Mound & Marullo, 1994 (Thysanoptera: Phlaeothripidae)

15-Apr-2009 | Uta Gehlsen, Peter Lindemann, Willi Rettig, Gerald Moritz, Gunther Tschuch, Chemoecology, 2009

Defensive secretions of adult males and females of the subsocial thrips Suocerathrips linguis were examined using gas chromatography–mass spectrometry (GC–MS). The samples contained six long-chain acetates and five aliphatic alkanes and alkenes. Whole-body extracts yielded six methyl esters of ...

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Chemical ecology involved in invasion success of the cuckoo bumblebee Psithyrus vestalis and in survival of workers of its host Bombus terrestris

03-Mar-2009 | A. Sramkova, M. Ayasse, Chemoecology, 2009

In bumblebees all species of the subgenus Psithyrus are social parasites in the nests of their Bombus hosts. In the bumblebee B. terrestris we investigated how colony size influences survival rates of nest entering females of the social parasite Psithyrus vestalis. Furthermore, we studied whether ...

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Identification of trail pheromone compounds from the labial glands of the stingless bee Geotrigona mombuca

07-Feb-2009 | Eva S. Stangler, Stefan Jarau, Michael Hrncir, Ronaldo Zucchi, Manfred Ayasse, Chemoecology, 2009

Foragers of several species of stingless bees deposit pheromone spots in the vegetation to guide recruited nestmates to a rich food source. Recent studies have shown that Trigona and Scaptotrigona workers secrete these pheromones from their labial glands. An earlier report stated that species ...

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Study of synthetic complex esters as automotive gear lubricants

01-Oct-2008 | Nagendramma, Ponnekanti; Kaul, Savita, Journal of Synthetic Lubrication, 2008

A number of di- and triol-centered polyols such as 2, 2-dimethyl-1, 3-propane diol, 2, 2-diethyl-1, 3-propane diol and 1, 1, 1-tris hydroxy methyl propane complex esters have been synthesized using di-carboxylic acids like adipic and sebacic acids (C6-C10) and 2-ethyl 1-hexanol with indigenous ...

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2‐Carboxy‐1‐naphthyl acetate

01-Dec-2007 | ; Bruno S. Souza; Adailton J. Bortoluzzi; Faruk Nome, Acta Crystallographica Section E, 2007

In the crystal structure of the title compound, C13H10O4, molecules are linked through centrosymmetrically related O—H...O hydrogen bonds by carboxyl pairing. Methyl H atoms of the acetoxy group are disordered over two equally occupied sites. The compound was prepared for the study of the ...

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2‐Carboxy‐1‐naphthyl acetate

01-Dec-2007 | Souza, Bruno S.; Bortoluzzi, Adailton J.; Nome, Faruk, Acta Crystallographica Section E, 2007

In the crystal structure of the title compound, C13H10O4, molecules are linked through centrosymmetrically related O—H...O hydrogen bonds by carboxyl pairing. Methyl H atoms of the acetoxy group are disordered over two equally occupied sites. The compound was prepared for the study of the ...

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