Methacrylic anhydride → Methacrylic Acid

HRID 1816081ノート

反応式

HRID 1816081 の反応式
[C:1]([O:6][C:7](=O)[C:8](C)=C)(=[O:5])[C:2]([CH3:4])=[CH2:3].OC(=C)C([O-])=O>>[C:1]([O:6][CH2:7][CH3:8])(=[O:5])[C:2]([CH3:4])=[CH2:3].[C:1]([OH:6])(=[O:5])[C:2]([CH3:4])=[CH2:3]

参加物

4

反応物 2

HCID 12974Methacrylic anhydride2 回HCID 178473601HCID 178473601、化合物

生成物 2

HCID 4093Methacrylic AcidHCID 7343Ethyl Methacrylate

実験手順

It is just as possible to use an excess of methacrylic anhydride, for example 20 mol %. In this case, after the reaction of the hydroxyacrylate (II) is as complete as possible, the excess methacrylic anhydride is destroyed by adding a low molecular weight alcohol such as methanol, ethanol, or isopropanol. This method is particularly recommended with longer-chained compounds (n=3-100). The excess methacrylic anhydride guarantees the most complete possible conversion of the hydroxy compound; the subsequent reaction of the methacrylic anhydride to give ethyl methacrylate and methacrylic acid, for example, ensures easier separation of these components with lower boiling points than methacrylic anhydride.

後処理

  1. customis destroyed
  2. additionby adding a low molecular weight alcohol such as methanol, ethanol, or isopropanol
  3. customthe subsequent reaction of the methacrylic anhydride

出典と根拠

ORDレコード
ord-6e3c636e6f1c475e867cf99c7cef1fe1
出典データセット
uspto-grants-2005_04
特許番号
US06881858B2

反応ノート

読み込み中…