M. Ángeles Fuentes

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Fumonisin mycotoxins contaminate maize worldwide. Analysis of maize samples (n = 396) collected from fields in Guatemala from 2000 to 2003 found that lowland maize (<360 m) had significantly more fumonisin B1 than highland maize (>1200 m). For example, 78% of the lowland samples collected at harvest in 2002 contained >0.3 microg/g of fumonisin B1, whereas(More)
The complexes F(n)-Tp(4Bo,3Rf)Ag(L) (F(n)-Tp(4Bo,3Rf)=a perfluorinated hydrotris(indazolyl) borate ligand; L=acetone or tetrahydrofuran) efficiently catalyze the functionalization of non-activated alkanes such as hexane, 2,3-dimethylbutane, or 2-methylpentane by insertion of CHCO(2)Et units (from N(2)CHCO(2)Et, ethyl diazoacetate, EDA) into their C-H bonds.(More)
The metalation reaction is currently in the midst of an extraordinary transformative period due largely to development of bimetallic metalating agents, which operate through metal-metal’ synergistic effects inaccessible to unimetal bases. Here the sodium alkylmagnesium amide [Na4Mg2(TMP)6(nBu)2], a template base as its deprotonating action is dictated(More)
The development of catalytic methods for the effective functionalization of methane yet remains a challenge. The best system known to date is the so-called Catalytica Process based on the use of platinum catalysts to convert methane into methyl bisulfate with a TOF rate of 10(-3) s. In this contribution, we report a series of silver complexes containing(More)
Bulky amido ligands are precious in s-block chemistry, since they can implant complementary strong basic and weak nucleophilic properties within compounds. Recent work has shown the pivotal importance of the base structure with enhancement of basicity and extraordinary regioselectivities possible for cyclic alkali metal magnesiates containing mixed(More)
Organometallic bases are becoming increasingly complex, because mixing components can lead to bases superior to single-component bases. To better understand this superiority, it is useful to study metalated intermediate structures prior to quenching. This study is on 1-phenyl-1H-benzotriazole, which was previously deprotonated by an in situ ZnCl2(More)
Excellent reagents for transferring their heterocalix[4]arene ligand to f-block organometallic complexes, lithium, sodium and potassium trans-calix[2]benzene[2]pyrrolides have been found to adopt a fascinating series of structures in their own right.
A novel fluorinated ligand, the anionic PhB(CH2P(p-CF3C6H4)2)3 (PhBP3 (p-CF3Ph)), has been synthesized and characterized, as well as its corresponding thallium, copper, and silver derivatives. The presence of fluorine atoms in the ligand structure induced the desired effect of enhancing electrophilic character at the metal center, without promoting(More)
Herein the sodium alkylmagnesium amide [Na4Mg2(TMP)6(nBu)2] (TMP=2,2,6,6-tetramethylpiperidide), a template base as its deprotonating action is dictated primarily by its 12 atom ring structure, is studied with the common N-heterocyclic carbene (NHC) IPr [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene]. Remarkably, magnesiation of IPr occurs at the(More)
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