Diazomethane


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diazomethane

[dī¦a·zō′me‚thān]
(organic chemistry)
CH2N2 A poisonous gas used in organic synthesis to methylate compounds.

Diazomethane

 

the very simple acyclic diazo compound CH2N2; a highly toxic and explosive yellowish gas with an unpleasant odor. Melting point, -145°C; boiling point, -23° C. The structure of diazomethane can be represented by the following formulas: Diazomethane.

Diazomethane is usually produced by treating nitrosomethylurea (1) or nitrosomethylurethane (2) with an alkali:

Diazomethane may react with or without the liberation of nitrogen. The most important reactions of diazomethane involve the liberation of N2: the generation of carbene upon pyrolysis or photolysis of diazomethane or under the catalytic action of powdered copper:

(3) CH2N2→:CH2+N2

reactions with acids, phenols, and alcohols, with the formation of corresponding methyl ethers and esters, such as

(4) CH3COOH + CH2N2→CH3COOCH3 + N2

and interaction with halogens and halides of other elements:

Diazomethane

Diazomethane reacts without the liberation of nitrogen with such compounds as the acid halides of carboxylic acids, resulting in the production of diazoketones. When the diazoketones decompose in the presence of water, alcohols, or amines and a catalyst (Ag2O), regrouping takes place, resulting in the formation of an acid (its ester or amide) with one more carbon atom than in the initial acid chloride (the Arndt-Eistert reaction):

Diazomethane

The synthesis of carboxylic acids is one of the most important applications of diazomethane; it is also used extensively as a methylizing agent.

B. L. DIATKIN

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Although the parent compound, diazomethane, was reactive, the TMS-substituted ylide gave significantly higher yields (>98% vs.
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The OH-PCBs in the sample extracts and calibration standards were methylated by adding diazomethane that was synthesized as described elsewhere (Sandau 2000).
813 g) was methylated with an ethereal solution of diazomethane and rechromatographed on a silica gel column (50 g, 2.
During this time he taught everyone in the organic laboratories to make diazomethane from 1-methyl-3-nitro-1-nitrosoguanidine (MNNG), a reaction discovered by McKay.
All of the phenolic compounds were methylated with fresh diazomethane, which was prepared from Diazald (Sigma Chemical Co.
We synthesized diazomethane in hexane by using N-nitroso-N-methylurea (Sigma-Aldrich, St.
Those methods that derivatize using methylating agents such as diazomethane cannot obtain an accurate analysis of DMP because endogenous inorganic phosphate produces the same trimethyl derivative.
Diazomethane was synthesized as described by Furniss et al.
Five drops of methanol were added, and the phenolic compounds were derivatized with diazomethane in diethyl ether (0.