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Tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate is a chemical compound used as a polymer stabilizer in plastics. Like other hindered phenols it acts as a primary antioxidant . More than 1000 tonnes per year are used in the EU.
One example is hexachlorocyclotriphosphazene (−N=P(−Cl) 2 −) 3. Bis(triphenylphosphine)iminium chloride [Ph 3 P=N=PPh 3] + Cl − is also referred to as a phosphazene, where Ph = phenyl group. The present article focuses on those phosphazenes with the formula R−N=P(−NR 2) 3.
At least three people, including an elderly woman with Alzheimer's and her two adult children, were killed in a raging housefire early Sunday morning in Bayside, Queens.
Dielectric films tend to exhibit greater dielectric strength than thicker samples of the same material. For instance, the dielectric strength of silicon dioxide films of thickness around 1 μm is about 0.5 GV/m. [3] However very thin layers (below, say, 100 nm) become partially conductive because of electron tunneling.
The Ph 3 C-H bond is relatively weak, with a bond dissociation energy (BDE) of 81 kcal/mol, or about 24 kcal/mol less than methane. [4] Correspondingly, triphenylmethane is mildly acidic, with a pK a of 33.297.
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PH 3 + 3 CH 2 =CHZ → P(CH 2 CH 2 Z) 3 (Z = NO 2, CN, C(O)NH 2) Tertiary phosphines of the type PRR′R″ are "P-chiral" and optically stable. From the commercial perspective, the most important phosphine is triphenylphosphine, several million kilograms being produced annually. It is prepared from the reaction of chlorobenzene, PCl 3, and ...
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