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Tetrachloro-1,2-difluoroethane is a chlorofluorocarbon known as Freon 112, CFC-112 or R-112. It has a symmetrical structure CCl 2 FCCl 2 F and so can be called symmetrical tetrachlorodifluoroethane. "Symmetrical" may also be abbreviated to "s-" or "sym-". In contrast an asymmetrical isomer has formula CCl 3 CClF 2.
The tetratricopeptide repeat (TPR) is a structural motif.It consists of a degenerate 34 amino acid tandem repeat identified in a wide variety of proteins.It is found in tandem arrays of 3–16 motifs, [1] which form scaffolds to mediate protein–protein interactions and often the assembly of multiprotein complexes.
Tetranitrogen and other similar polynitrogen compounds are predicted to be good candidates for use as high-energy-density matter (HEDM), high-energy fuel sources with small weight in comparison with traditional liquid- and fuel-cell-based energy sources.
2,3,7,8-Tetrachlorodibenzofuran (TCDF) is a polychlorinated dibenzofuran with a chemical formula of C 12 H 4 Cl 4 O. TCDF is part of the chlorinated benzofuran (CDF) family that contains between 1 and 8 chlorine atoms attached to the parent dibenzofuran ring system. The CDF family includes 135 compounds, of which only a few have been studied.
The most common abnormality the test can screen is trisomy 21 (Down syndrome).In addition to Down syndrome, the triple and quadruple screens assess risk for fetal trisomy 18 also known as Edwards syndrome, open neural tube defects, and may also detect an increased risk of Turner syndrome, triploidy, trisomy 16 mosaicism, fetal death, Smith–Lemli–Opitz syndrome, and steroid sulfatase ...
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1,1,1,2-Tetrachloropropane is a compound of chlorine, hydrogen, and carbon. It has chemical formula C 3 H 4 Cl 4 . The structure has a propane skeleton, but four of the hydrogen atoms are replaced by chlorine atoms.
Oxidation of alcohol to aldehyde with TPAP (0.06 eq.) and N-methylmorpholine N-oxide (1.7 eq.) with molecular sieves in dichloromethane. [1]Ruthenium tetroxide is a highly aggressive oxidant, but TPAP, which is its one-electron reduced derivative, is a mild oxidizing agent for the conversion of primary alcohols to aldehydes (the Ley oxidation). [2]