Diethyl Malonate → Diethyl [3-ethoxyprop-2-enylidene]malonate

HRID 436702

反応式

HRID 436702 の反応式
C([O:3][CH:4]([O:13][CH2:14][CH3:15])[CH2:5][CH:6]([O:10]CC)[O:7][CH2:8][CH3:9])C.C(OC(=O)C)(=O)C.[C:23](OCC)(=O)[CH2:24][C:25]([O:27][CH2:28][CH3:29])=O>>[CH2:28]([O:27][CH:25]=[CH:24][CH:23]=[C:5]([C:4]([O:13][CH2:14][CH3:15])=[O:3])[C:6]([O:7][CH2:8][CH3:9])=[O:10])[CH3:29]

参加物

4

反応物 3

HCID 7761Diethyl MalonateHCID 7918Acetic AnhydrideHCID 671471,1,3,3-Tetraethoxypropane

生成物 1

HCID 365954Diethyl [3-ethoxyprop-2-enylidene]malonate

実験手順

To a stirred, refluxing solution of 1.0 g. of freshly fused zinc chloride in 220 g. (1.0 mole) of 1,1,3,3-tetraethoxypropane and 200 g. (1.96 moles) of acetic anhydride is added dropwise during 3 hr. 10 min. 91 g. (0.57 mole) of diethyl malonate. After addition is complete, the reaction mixture is refluxed for one-half hour after which time the lower boiling components of the reaction mixture are removed by distillation up to a vapor temperature of 120° C. (pot 130° C.). An additional 50 ml. of acetic anhydride are added and reflux is continued for 16 hr. Again, low boilers are removed and the desired product is isolated from the residue by vacuum distillation. There is obtained 120 g. (87%) of product as a yellow oil: b.p. 110°-128°/0.1-1.7 mm. ν (film) 1720 (C=O) and 1610 cm.-1 (C=O); δ(TMS,CDCL3) 7.47, 7.13, 6.25 (s, s, t, 1 H each, olefinic protons), 3.84-4.6 (m, 6H, ethyl methylene) and 1.35 (overlapping triplets, 9H, ethyl methyls).

後処理

  1. temperatureTo a stirred, refluxing solution of 1.0 g
  2. custom10 min
  3. additionAfter addition
  4. temperaturethe reaction mixture is refluxed for one-half hour after which time the
  5. customare removed by distillation up to a vapor temperature of 120° C. (pot 130° C.)
  6. additionof acetic anhydride are added
  7. temperaturereflux
  8. customAgain, low boilers are removed

出典と根拠

ORDレコード
ord-8ecdf9534144425c9a38be60343a21ef
出典データセット
uspto-grants-1977_06
特許番号
US04028084

関連ノート

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