2-isobutyl-2-cyclopenten-1-one | 30122-05-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2-isobutyl-2-cyclopenten-1-one
• 英文别名: 2-isobutyl-cyclopent-2-enone；2-Isobutyl-cyclopent-2-enon；2-Isobutylcyclopent-2-enon；2-(2-Methylpropyl)cyclopent-2-en-1-one
• CAS: 30122-05-5
• 化学式: C₉H₁₄O
• 分子量: 138.21
• InChiKey: AEXVKFSRZVVVDX-UHFFFAOYSA-N

物化性质

• 熔点：
  217-218 °C
• 沸点：
  211.0±10.0 °C(Predicted)
• 密度：
  0.937±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  10
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  2-(2-甲基亚丙基)环戊烷-1-酮 在 盐酸 作用下， 以 正丁醇 为溶剂， 生成 2-isobutyl-2-cyclopenten-1-one
  参考文献：
  名称：

  Caton,M.P.L. et al., Synthetic Communications, 1974, vol. 4, p. 303 - 306

  摘要：

  DOI：

文献信息

• Strictly Regiocontrolled α-Monosubstitution of Cyclic Carbonyl Compounds with Alkynyl and Alkyl Groups via Pd-Catalyzed Coupling of Cyclic α-Iodoenones with Organozincs
  作者：Ei-ichi Negishi、Ze Tan、Show-Yee Liou、Baiqiao Liao

  DOI：10.1016/s0040-4020(00)00864-4

  日期：2000.12

  derivatives readily undergo Pd-catalyzed cross coupling with α-iodoenones. Although (s-Bu)2Zn also undergoes Pd-catalyzed cross coupling, only the n-Bu-substituted products were obtained. α-Benzylation and α-homobenzylation can proceed satisfactorily, whereas allylzinc and propargylzinc derivatives undergo only addition to the carbonyl group. Although some promising results have been obtained in α-homoallylation

  已优化了Pd催化的环状α-碘烯酮（如2-碘-2-环己烯酮）与炔基锌的交叉偶联条件。使用三（邻-呋喃基）膦（TFP）作为配体和使用DMF作为溶剂已导致以优异的产率形成α-炔基酮。该最优化的方法已用于高产率合成（±）-harveynone和（±）-tricholomenynA。对使用烷基锌的相关α-烷基化反应的研究揭示了以下内容。甲基锌和伯烷基锌衍生物容易与α-碘烯酮进行Pd催化的交叉偶联。尽管（s -Bu）2 Zn也经历Pd催化的交叉偶联，但只有n获得-Bu-取代的产物。α-苄基化和α-高苄基化可以令人满意地进行，而烯丙基锌和炔丙基锌衍生物仅在羰基上加成。尽管已经在α-均烯丙基化和α-均丙炔化中获得了一些有希望的结果，但是这些反应仍需要进一步改善。
• Process for producing 2-alkyl-2cyclopentenones
  申请人：TAKASAGO INTERNATIONAL CORPORATION

  公开号：US20030109755A1

  公开（公告）日：2003-06-12

  Industrially advantageous processes for producing a 2-alkyl-2-cyclopentenone in high yields starting from a 2-(1-hydroxyalkyl)cyclopentanone or a 2-alkylidenecyclopentanone, which are obtainable from a cyclopentanone and a carbonyl compound. A 2-(1-hydroxyalkyl)cyclopentanone represented by the following general formula (1): 1 (wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 each independently represents hydrogen atom, an alkyl group having 1 to 10 carbon atoms which may have one or more substituents or an aromatic group which may have one or more substituents, and each of (1) R 6 or R 7 with R 3 and (2) R 6 or R 7 with R 4 or R 5 may be together combined to form a ring which may have a double bond) is subjected to dehydrative isomerization in the presence of a bromine compound and/or an iodine compound.

  从环戊酮和羰基化合物获得的2-(1-羟基烷基)环戊酮或2-烷基亚烯环戊酮，是从高产率开始生产2-烷基-2-环戊酮的工业上有利的过程。在以下一般式（1）中表示的2-(1-羟基烷基)环戊酮中（其中R1、R2、R3、R4、R5、R6和R7分别独立地表示氢原子、具有1至10个碳原子的烷基基团，可能具有一个或多个取代基或可能具有一个或多个取代基的芳香基团，且(1) R6或R7与R3和(2) R6或R7与R4或R5中的每一个可能结合在一起形成可能具有双键的环)在溴化合物和/或碘化合物的存在下进行脱水异构化。
• Process for the Preparation of Cyclopentanone Derivatives
  申请人：Lem Jorge M.

  公开号：US20080214859A1

  公开（公告）日：2008-09-04

  The present invention relates to the field of organic synthesis and more particularly to a new process for the preparation of an acetal derivative of an alkyl 3-oxo-2-(2-oxoethyl)-1-cyclopentaneacetate. The invention also relates to a method to use said acetal derivative to prepare intermediates useful for the preparation of perfuming ingredients.

  本发明涉及有机合成领域，更具体地涉及一种制备烷基3-氧代-2-(2-氧代乙基)-1-环戊酰乙酸酯缩醛衍生物的新工艺。本发明还涉及一种使用该缩醛衍生物制备用于制备香料成分的中间体的方法。
• Process for producing 2-alkyl-2-cyclopentenones
  申请人：Takasago International Corporation

  公开号：EP1316541A1

  公开（公告）日：2003-06-04

  Industrially advantageous processes for producing a 2-alkyl-2-cyclopentenone in high yields starting from a 2-(1-hydroxyalkyl)cyclopentanone or a 2-alkylidenecyclopentanone, which are obtainable from a cyclopentanone and a carbonyl compound. A 2-(1-hydroxyalkyl)cyclopentanone represented by the following general formula (1): is subjected to dehydrative isomerization or a 2- alkylidenecyclopentanone represented by the following general formula (3): is isomerized. Both reactions take place in the presence of a bromine compound and/or an iodine compound. In the above formulae, R1-R7 have the meanings given in the description.

  以 2-(1-羟基烷基)环戊酮或 2-亚烷基环戊酮为原料，高产率生产 2-烷基-2-环戊酮的具有工业优势的工艺，这些环戊酮可从环戊酮和羰基化合物中获得。由以下通式 (1) 代表的 2-(1-羟基烷基)环戊酮： 的 2-(1-羟基烷基)环戊酮进行脱水异构化，或将以下通式(3)代表的 2-亚烷基环戊酮进行异构化： 进行异构化。这两种反应均在溴化合物和/或碘化合物存在下进行。 在上式中，R1-R7 具有说明中给出的含义。
• Cardinale, G.; Laan, J. A. M.; Russel, S. W., Recueil des Travaux Chimiques des Pays-Bas, 1982, vol. 101, # 6, p. 199 - 202
  作者：Cardinale, G.、Laan, J. A. M.、Russel, S. W.、Ward, J. P.

  DOI：——

  日期：——