Zingaro, Ralph A.; Pathirana, Hema M. K. K.; Reibenspies, Joseph H., Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 62, # 1.4, p. 91 - 99
alkyl substrates were efficiently converted in combination with different type of amines and vicinal diols into various substituted pyrroles in reasonable to excellent isolated yields. Additionally, α-functionalized ketones gave synthetically interesting amido-, alkoxy-, aryloxy-, and phosphate-substituted pyrroles in a straightforward manner. The synthetic protocol proceeds in the presence of a commercially
A novel hybrid system for the direct oxidation of ethane to acetic and glycolic acids in aqueous medium
作者:Ayusman Sen、Minren Lin
DOI:10.1039/c39920000508
日期:——
A combination of platinum(II) ion and metallic platinum is found to oxidise ethane to a mixture of acetic and glycolic acids in aqueous medium in the presence of oxygen; the platinum(II) ion is responsible for the initial C–H activation step leading eventually to the formation of ethanol and ethylene glycol, while metallic platinum catalyses the subsequent air oxidation of the alcohols to the corresponding acids.
Three analogues of 5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide (DEPMPO, 1) labelled with two (1-d2), five (1-d5) or seven (1-d7)
2H were synthesized and used to trap the tert-butylperoxyl radical. The EPR spectra of 1-d2-OOBut and 1-d7-OOBut spin adducts exhibited more straightforward patterns and better signal to noise ratio than those obtained with 1 or 1-d5. The use of the easily available 1-d2 as spin trap could help significantly the analysis of the EPR signals when the signal of either superoxide or alkylperoxyl spin adduct is superimposed with the signals of other spin adducts.
Selectivity of nucleic acid diagnostic and microarray technologies by control of interfacial nucleic acid film chemistry
申请人:Piunno A.E. Paul
公开号:US20050181384A1
公开(公告)日:2005-08-18
The invention provides methods for conducting hybridizations having increased selectivity of hybridization using substrates upon which probe nucleic acids are immobilized. The methods of this invention can be used to increase selectivity in nucleic acid diagnostic devices, such as biosensors and microarrays. The invention provides increased selectivity through control of the substrate surface chemistry and in particular, through control of the density of nucleic acids and other oligomers immobilized on a surface. The invention provides improved signal to noise in hybridization assays via enhanced differences in signal magnitude generated for fully matched target nucleic acid compared to partially matched target nucleic acid prior to signal processing. Specifically, invention provides methods for using substrates having medium-high to high immobilization densities to achieve higher hybridization The methods and substrates of this invention are particularly well-suited to assays for genetic targets in samples that contain genetic species that are very similar in nucleic acid sequence to the genetic target. The methods and substrates of this invention are also well-suite for single nucleotide polymorphism (SNP) analysis.
Competition between C–C and C–H Bond Fluorination: A Continuum of Electron Transfer and Hydrogen Atom Transfer Mechanisms
作者:Muyuan Wang、Rozhin Rowshanpour、Liangyu Guan、Jonah Ruskin、Phuong Minh Nguyen、Yuang Wang、Qinze Arthur Zhang、Ran Liu、Bill Ling、Ryan Woltornist、Alexander M. Stephens、Aarush Prasad、Travis Dudding、Thomas Lectka、Cody Ross Pitts
DOI:10.1021/jacs.3c06477
日期:2023.10.18
initially suspected photoinduced electron transfer). This finding led to proof of concept for two new methodologies, demonstrating that unstrained C–Cbond fluorination can also be achieved under chemical and electrochemical conditions. Moreover, as C–C and C–Hbond fluorination reactions are both theoretically possible on 2-aryl-cycloalkanone acetals and would involve the same reactive intermediate, we studied