504-57-4Relevant articles and documents
Characterization of uranyl soaps by spectroscopic and thermal measurements
Mehrotra, K. N.,Sharma, Meera,Gahlaut, A. S.
, p. 310 - 312 (1988)
The infrared and visible spectrophotometric data of uranyl soaps showed that metal-oxygen bonds in uranyl soaps are not purely ionic but are partially covalent in character.The X-ray diffraction patterns confirmed the double-layer structure with molecular
PROCESS FOR THE DECARBOXYLATIVE KETONIZATION OF FATTY ACIDS OR FATTY ACID DERIVATIVES
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Paragraph 00160-00166, (2016/11/21)
A process for the decarboxylative ketonizationof fatty acids, fatty acid derivatives or mixtures thereof in the liquid phase with metal compounds as catalyst wherein the fatty acids, fatty acid derivatives or mixtures thereof are added sequentially.
Purification and characterization of OleA from Xanthomonas campestris and demonstration of a non-decarboxylative claisen condensation reaction
Frias, Janice A.,Richman, Jack E.,Erickson, Jasmine S.,Wackett, Lawrence P.
experimental part, p. 10930 - 10938 (2012/03/26)
OleA catalyzes the condensation of fatty acyl groups in the first step of bacterial long-chain olefin biosynthesis, but the mechanism of the condensation reaction is controversial. In this study, OleA from Xanthomonas campestris was expressed in Escherichia coli and purified to homogeneity. The purified protein was shown to be active with fatty acyl-CoA substrates that ranged from C 8 to C16 in length. With limiting myristoyl-CoA (C 14), 1 mol of the free coenzyme A was released/mol of myristoyl-CoA consumed. Using [14C]myristoyl-CoA, the other products were identified as myristic acid, 2-myristoylmyristic acid, and 14-heptacosanone. 2-Myristoylmyristic acid was indicated to be the physiologically relevant product of OleA in several ways. First, 2-myristoylmyristic acid was the major condensed product in short incubations, but over time, it decreased with the concomitant increase of 14-heptacosanone. Second, synthetic 2-myristoylmyristic acid showed similar decarboxylation kinetics in the absence of OleA. Third, 2-myristoylmyristic acid was shown to be reactive with purified OleC and OleD to generate the olefin 14-heptacosene, a product seen in previous in vivo studies. The decarboxylation product, 14-heptacosanone, did not react with OleC and OleD to produce any demonstrable product. Substantial hydrolysis of fatty acyl-CoA substrates to the corresponding fatty acids was observed, but it is currently unclear if this occurs in vivo. In total, these data are consistent with OleA catalyzing a non-decarboxylative Claisen condensation reactionin the first step of the olefin biosynthetic pathway previously found to be presentin at least 70 different bacterial strains.
