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Qu'est-ce (qui) est methylene - définition
WIKIMEDIA DISAMBIGUATION PAGE
Methene; Methylenes; Methylene (disambiguation)
Methylene
·noun A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2;
- formerly called also methene.
methylene
['m???li:n]
¦ noun [as modifier] Chemistry of or denoting the divalent radical ?CH2?.
Origin
C19: from Fr. methylene (formed irregularly from Gk methu 'wine' + hule 'wood') + -ene.
Methylene group
![Acidity of [[diethyl malonate]], a 1,3-dicarbonyl compound](https://commons.wikimedia.org/wiki/Special:FilePath/Diethyl malonate acidity vectorized.svg?width=200 "Acidity of [[diethyl malonate]], a 1,3-dicarbonyl compound")
FUNCTIONAL GROUP
Activated methylene
In organic chemistry, a methylene group is any part of a molecule that consists of two hydrogen atoms bound to a carbon atom, which is connected to the remainder of the molecule by two single bonds. The group may be represented as , where the '<' denotes the two bonds.
Wikipédia
Methylene
Methylene may refer to:
- Methylene group or methylene bridge (CH2< or equivalently -CH2-), a part of a molecule connected to the rest of the molecule by two single bonds.
- An older name for methylidene (=CH2), a part of a molecule connected to another atom by a double bond.
- Methylene (compound) (CH2), an organic compound.
Exemples du corpus de texte pour methylene
1. The EPA assessment evaluated toxins including heavy metals, such as lead; volatile chemicals, such as benzene; combustion byproducts, such as acrolein; and solvents, including perchloroethylene and methylene chloride.
2. The substance methylene chloride was not emitted from the ESC site, he adds, and expects a repeat test soon to prove this.
3. The company arrives time after time at the edge of the abyss and imposes on the ministry and the local council improvised solutions that endanger the environment." He also says that air–quality tests near the site found the carcinogen methylene chloride (used as a paint solvent) in concentrations 30 times higher than recommended.
4. Frutarom operates in complete coordination with the Environmental Protection Ministry and invests tremendous resources in protecting the environment according to ministry guidelines." It said that it had "no knowledge of plans to act against the factory and if an indictment is filed we are convinced the courts will quickly realize any charges are baseless." The ministry this week published the results of extensive air–quality testing conducted over the past year that indicate high quantities of carcinogenic substances and pollutants that were not previously examined such as benzene, chloroform, methylene and chloride.