Conversion of biomass to chemicals over zirconium phosphate-based catalysts

1.IntroductionCatalysis is an important phenomenon in nature and is involvedin all areas of the chemical industry.Homogeneous andheterogeneous catalysis are key techniques in chemical production.The development of efficient,stable,and environmentallyfriendly catalytic methods is receiving much attentionbecause of the increasing global shortage of energy and seriousenvironmental damage.A number of efforts have been made inthe past for designing rationally catalysts to achieve desirablecatalytic activities,selectivities,and stabilities for specific reactions[1].The current energy crisis is affecting economies inevery region,particularly in fossil‐oil‐consuming countries,because of rapidly decreasing available stocks,therefore biomassconversion to fuels and chemicals using various approaches,including thermal,biological,and chemocatalyticprocesses,is attracting great attention worldwide[2].

(Salen)osmium (Ⅵ) nitrides catalyzed glutathione depletion in chemotherapy

Glutathione depletion provides a promising strategy for the design of non-platinum anticancer drugs.Here we report a series of electrophilic (salen)osmium(Ⅵ) nitrides that react with glutathione to generate (salen)osmium(Ⅲ) ammine compounds.In vitro studies indicate that these osmium(VI) nitrides show comparable cytotoxicity to cisplatin against various carcinoma.Mechanistic studies with the representative compound[OsⅥ(N)(LH)(OH_(2))](PF6)(1,LH=N,N’-bis(salicylidene)-o-cyclohexyldiamine dianion) suggest that 1 induces glutathione depletion,reactive oxygen species generation,endoplasmic reticulum stress,and in turn triggers death receptor-mediated apoptosis and autophagy in lung cancer cells.In vivo evaluations show that 1 can inhibit tumor xenograft growth effectively with no body weight drop.