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Ph 2 S 2 is rarely prepared in the laboratory because it is inexpensive, and the precursor has a disagreeable odour. Like most organic disulfides, the C–S–S–C core of Ph 2 S 2 is non-planar with a dihedral angle approaching 85°. [3] Ball-and-stick model of diphenyl disulfide. The S-S bond distance is 2.03 Å.
16731–55–8 K 2 S 2 O 7: potassium pyrosulfate: 7790–62–7 K 2 S 2 O 8: potassium persulfate: 7727–21–1 K 2 Se: potassium selenide: 1312–74–9 K 2 SiF 6: potassium hexafluorosilicate: 16871–90–2 K 2 SiO 4: potassium silicate: 10006–28–7 K 2 Te: potassium telluride: 12142–40–4 K 2 TeO 3: potassium tellurite: 15571–91 ...
These are prepared by the polymerisation of 6FDA with an aromatic diamine such as 3,5-diaminobenzoic acid or 4,4'-diaminodiphenyl sulfide. [2] Such fluorinated polyimides are used in special applications, e. g. used to make gas-permeable polymer membranes, [ 3 ] in the field of microelectronics and optics, such as optical lenses from polymers ...
The check digit is found by taking the last digit times 1, the preceding digit times 2, the preceding digit times 3 etc., adding all these up and computing the sum modulo 10. For example, the CAS number of water is 7732-18-5: the checksum 5 is calculated as (8×1 + 1×2 + 2×3 + 3×4 + 7×5 + 7×6) = 105; 105 mod 10 = 5.
Bis(benzonitrile)palladium dichloride is the coordination complex with the formula PdCl 2 (NCC 6 H 5) 2. It is the adduct of two benzonitrile (PhCN) ligands with palladium(II) chloride. It is a yellow-brown solid that is soluble in organic solvents. The compound is a reagent and a precatalyst for reactions that require soluble Pd(II). [1]
CF 3 SO 2 OAg + RX → CF 3 SO 2 OR + AgX (X = iodide usually) In coordination chemistry, the salt is also useful to replace halide ligands with the more labile triflate ligand. For example, bromopentacarbonylrhenium can be converted to the more labile derivative using silver triflate: [6] CF 3 SO 2 OAg + BrRe(CO) 5 → CF 3 SO 2 ORe(CO) 5 + AgBr
Acetonedicarboxylic acid, 3-oxoglutaric acid or β-ketoglutaric acid is a simple dicarboxylic acid with the formula O=C(CH 2 CO 2 H) 2. β-Ketoglutarate does not have the biological activity exhibited by α-ketoglutarate. [2]
It is commonly used in the treatment of varicose and spider veins of the leg, during the procedure of sclerotherapy. [2] Being a detergent , its action is on the lipid molecules in the cells of the vein wall, causing inflammatory destruction of the internal lining of the vein and thrombus formation eventually leading to sclerosis of the vein.