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Tetrahydrothiophene is a heterocyclic organic compound consisting of a five-membered ring containing four carbon atoms and a sulfur atom. It is the saturated analog of thiophene. It is a volatile, clear, colorless liquid with a strong unpleasant odor. Because of its smell, tetrahydrothiophene is occasionally used as an odorant in natural gas, in place of the more common ethanethiol. It is also used as a solvent, as an insecticide, and as a moth repellent. It is an intermediate in the preparation of the solvent sulfolane, which is produced by the oxidation of tetrahydrothiophene. It is also used as an electrolyte for lithium batteries. As an odorant, it has numerous advantages against ethanethiol. It is not corrosive to the gas pipes and valves, it does not cause habitual deactivation of sense of smell, and it does not cause irritant responses of coughing, tears, and headache. It is regarded to be an ideal gas indicator in use. This compound is used as an easily-displaceable ligand in chloro(tetrahydrothiophene)gold(I).

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Tetrahydroxysilane is a silanol. It was discovered by Jöns Jacob Berzelius between 1810 and 1836 when studying silicon generated by his experiments. Tetrahydroxysilane can be produced by the acidification of sodium silicate in aqueous solution. It is created near the ocean's surface, by the process of hydration. It is carried into the abyssopelagic zone by falling water in the poles.

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Tetrakis(triphenylphosphine) Palladium (0)

Tetrakis(triphenylphosphine) palladium (0) is a chemical compound. It is widely used as a catalyst for palladium-catalyzed coupling reactions. Prominent applications include the Heck reaction, Suzuki coupling, Stille coupling, Sonogashira coupling, and Negishi coupling.

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