2-benzylidene-1,1,3,3-tetramethylindan | 75501-29-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 茚满类
• 英文名称: 2-benzylidene-1,1,3,3-tetramethylindan
• 英文别名: 2-Benzyliden-1,1,3,3-tetramethylindan；2-Benzylidene-1,1,3,3-tetramethyl-2,3-dihydro-1H-indene；2-benzylidene-1,1,3,3-tetramethylindene
• CAS: 75501-29-0
• 化学式: C₂₀H₂₂
• 分子量: 262.395
• InChiKey: BBMGGEGEPGNFRB-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.9
• 重原子数：
  20
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  2-benzylidene-1,1,3,3-tetramethylindan 在 正丁基锂 、 2,2,2-tribromo-1,3,2-benzodioxaphosphole 、 双氧水 、 乙酸酐 作用下， 以 四氢呋喃 、 正己烷 、 二氯甲烷 、 溶剂黄146 为溶剂， 反应 3.5h， 生成 2-(α-Brombenzyliden)-1,1,3,3-tetramethylindan
  参考文献：
  名称：

  Carbenoid-mediated nucleophilic “hydrolysis” of 2-(dichloromethylidene)-1,1,3,3-tetramethylindane with DMSO participation, affording access to one-sidedly overcrowded ketone and bromoalkene descendants^§

  摘要：

  2-(二氯甲基亚甲基)-1,1,3,3-四甲基茚烷在DMSO作为溶剂的固体KOH存在下，通过最初的氯粒子转移反应形成了Cl,K-卡宾中间体，反应温度≥100°C。这种短暂的中间体通过可逆的质子转移来表明其存在，该过程与DMSO中的氧转移竞争，产生了二甲基硫。推测所得的短暂的酮烯通过与KOH结合形成了1,1,3,3-四甲基茚烷-2-羧酸钾盐（一种形式的水解产物）。该关键酸的锂盐能够酰化芳基锂化合物，产生单面过度拥挤的酮和相应的三级醇。后者是副产物（约10%），与它们的芳基基团的旋转自由度减小相应地形成。作为一个不太麻烦的进一步副产物，上述关键酸的二阴离子通过羧化反应被识别出来，形成了1,1,3,3-四甲基茚烷-2,2-二羧酸。酮的溴化脱氧反应生成了两个单面过度拥挤的溴代烯烃。有关上述Cl,K-卡宾中间体的一些相关性质在支持信息文件1中提供。

  DOI：

  10.3762/bjoc.10.28
• 作为产物：
  描述：

  氯化苄 在 氯化亚砜 、 溴 、 magnesium 作用下， 以 吡啶 为溶剂， 反应 15.0h， 生成 2-benzylidene-1,1,3,3-tetramethylindan
  参考文献：
  名称：

  Knorr, Rudolf; Lattke, Ernst; Raepple, Edith, Liebigs Annalen der Chemie, 1980, # 8, p. 1207 - 1215

  摘要：

  DOI：

文献信息

• Carbenoid Chain Reactions through Proton, Deuteron, or Bromine Transfer from Unactivated 1-Bromo-1-alkenes to Organolithium Compounds
  作者：Rudolf Knorr、Claudio Pires、Johannes Freudenreich

  DOI：10.1021/jo070623w

  日期：2007.8.1

  The deceptively simple vinylic substitution reactions Alk(2)CCABr + RLi -> Alk(2)CCAR + LiBr (A = H, D, or Br) occur via an alkylidenecarbenoid chain mechanism (three steps) without transition metal catalysis. 2-(Bromomethylidene)-1,1,3,3-tetramethylindan (Alk(2)CCH-Br, 2a) is deprotonated (step 1) by phenyllithium (PhLi) to give the Br,Li-alkylidenecarbenoid Alk(2)CCLi-Br (3). In the ensuing chain cycle, 3 and PhLi (step 2) form the observable alkenyllithium intermediate Alk(2)CCLiPh that characterizes the carbenoid mechanism in Et2O and is able to propagate the chain (step 3) through deprotonation of 2a, furnishing carbenoid 3 and the product Alk(2)CCHPh. The related 2-(dibromomethylidene)-1,1,3,3-tetramethylindan (Alk(2)CCBr(2), 2c) and methyllithium (MeLi) generate carbenoid 3 (step 1), which incorporates MeLi (step 2) to give Alk(2)CCLiCH(3), which reacts with 2c by bromine transfer producing Alk(2)CCBrCH(3) and carbenoid 3 (step 3). PhCCLi cannot carry out step 1, but MeLi can initiate (step 1) the carbenoid chain cycle (steps 2 and 3) of 2c with PhCCLi leading to Alk(2)CCBrCC-Ph. Reagent 2a may perform both proton and bromine transfer toward Alk(2)CCLiCH(3), feeding two coupled carbenoid chain processes in a ratio that depends on the solvent and on a primary kinetic H/D isotope effect.
• KNORR R.; LATTKE E.; RAEPPLE E., LIEBIGS ANN. CHEM., 1980, NO 8, 1207-1215
  作者：KNORR R.、 LATTKE E.、 RAEPPLE E.

  DOI：——

  日期：——
• Knorr, Rudolf; Lattke, Ernst; Raepple, Edith, Liebigs Annalen der Chemie, 1980, # 8, p. 1207 - 1215
  作者：Knorr, Rudolf、Lattke, Ernst、Raepple, Edith

  DOI：——

  日期：——
• Carbenoid-mediated nucleophilic “hydrolysis” of 2-(dichloromethylidene)-1,1,3,3-tetramethylindane with DMSO participation, affording access to one-sidedly overcrowded ketone and bromoalkene descendants^§
  作者：Rudolf Knorr、Thomas Menke、Johannes Freudenreich、Claudio Pires

  DOI：10.3762/bjoc.10.28

  日期：——

  2-(Dichloromethylidene)-1,1,3,3-tetramethylindane was “hydrolyzed” by solid KOH in DMSO as the solvent at ≥100 °C through an initial chlorine particle transfer to give a Cl,K-carbenoid. This short-lived intermediate disclosed its occurrence through a reversible proton transfer which competed with an oxygen transfer from DMSO that created dimethyl sulfide. The presumably resultant transitory ketene incorporated KOH to afford the potassium salt of 1,1,3,3-tetramethylindan-2-carboxylic acid (the product of a formal hydrolysis). The lithium salt of this key acid is able to acylate aryllithium compounds, furnishing one-sidedly overcrowded ketones along with the corresponding tertiary alcohols. The latter side-products (ca. 10%) were formed against a substantially increasing repulsive resistance, as testified through the diminished rotational mobility of their aryl groups. As a less troublesome further side-product, the dianion of the above key acid was recognized through carboxylation which afforded 1,1,3,3-tetramethylindan-2,2-dicarboxylic acid. Brominative deoxygenation of the ketones furnished two one-sidedly overcrowded bromoalkenes. Some presently relevant properties of the above Cl,K-carbenoid are provided in Supporting Information File 1.

  2-(二氯甲基亚甲基)-1,1,3,3-四甲基茚烷在DMSO作为溶剂的固体KOH存在下，通过最初的氯粒子转移反应形成了Cl,K-卡宾中间体，反应温度≥100°C。这种短暂的中间体通过可逆的质子转移来表明其存在，该过程与DMSO中的氧转移竞争，产生了二甲基硫。推测所得的短暂的酮烯通过与KOH结合形成了1,1,3,3-四甲基茚烷-2-羧酸钾盐（一种形式的水解产物）。该关键酸的锂盐能够酰化芳基锂化合物，产生单面过度拥挤的酮和相应的三级醇。后者是副产物（约10%），与它们的芳基基团的旋转自由度减小相应地形成。作为一个不太麻烦的进一步副产物，上述关键酸的二阴离子通过羧化反应被识别出来，形成了1,1,3,3-四甲基茚烷-2,2-二羧酸。酮的溴化脱氧反应生成了两个单面过度拥挤的溴代烯烃。有关上述Cl,K-卡宾中间体的一些相关性质在支持信息文件1中提供。