We report on the synthesis of a distannyne supported by pincer ligand bearing pendant amine donors that is capable reversibly activating E-H bonds at one or both tin centres through dissociation hemi-labile N-Sn donor/acceptor interactions. This chemistry can be exploited to sequentially (and reversibly) assemble mixed-valence chains atoms type ArSn{Sn(Ar)H}nSnAr (n=1, 2). The experimentally ob...

X-ray diffraction studies demonstrate that oxidative addition of SiH(4) to Ir(PPh(3))(2)(CO)Cl yields Ir(PPh(3))(2)(CO)(Cl)(SiH(3))H, which features a cis arrangement of the SiH(3) and H ligands in which H is located trans to CO, rather than trans to Cl as originally reported. (1)H NMR spectroscopic studies indicate that oxidative addition of GeH(4) to Ir(PPh(3))(2)(CO)Cl also occurs in a cis m...

the first reaction between food components and biological tissues occurs in the oral cavity. saliva modulates the ecosystem in the oral cavity and plays a critical role in oral homeostasis. in addition, saliva is a first line of defense against free radical-mediated stress. salivary antioxidant defense mechanisms seem to be very important. in this study we discuss in detail free radicals (fr) a...

glucose-6-phosphate dehydrogenase (g6pd) deficient subjects are vulnerable to oxidative stress. quercetin, a flavonoids, has been employed as a potent oxygen-free radical scavenger in order to assess the protective effects of quercetin against h2o2-induced oxidative damage in g6pd-deficient and normal human erythrocytes. erythrocytes of g6pd-deficient (n = 10) and normal (n = 10) subjects were ...