trimethyl(3-phenethyl-5-phenylpenta-1,2-dien-1-yl)silane | 1266614-66-7

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: trimethyl(3-phenethyl-5-phenylpenta-1,2-dien-1-yl)silane
• CAS: 1266614-66-7
• 化学式: C₂₂H₂₈Si
• 分子量: 320.55
• InChiKey: LQCDKFGYPAPEIL-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.21
• 重原子数：
  23
• 可旋转键数：
  7
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.32
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为产物：
  描述：

  1,5-二苯基-3-戊酮 、 三甲基硅烷化重氮甲烷 在 正丁基锂 作用下， 以 四氢呋喃 、 乙醚 、 正己烷 为溶剂， 反应 4.5h， 以72%的产率得到trimethyl(3-phenethyl-5-phenylpenta-1,2-dien-1-yl)silane
  参考文献：
  名称：

  Selectivity Control in Alkylidene Carbene-Mediated C−H Insertion and Allene Formation

  摘要：

  Regioselectivity of alkylidene carbene-mediated C-H insertion was explored utilizing electronic, conformational, steric, and stereoelectronic effects. Relying on these factors, highly regio- and chemoselective carbene insertion reaction of C-H bonds in different environments could be obtained. The observed selectivity clearly indicates that an electronic effect plays a more important role than steric effect. In general, C-H bonds in conformationally rigid cyclic environments are less reactive than those in acyclic systems toward carbene insertion, and in this situation, a competing intermolecular reaction between alkylidene carbene and trimethylsilyldiazomethane led to the formation of allenylsilanes. The formation of allenylsilane becomes more favorable as the concentration of reaction becomes higher, as well as the C-H bonds undergoing insertion becomes electronically and conformationally deactivated.

  DOI：

  10.1021/jo102180f

文献信息

• Transformation of Carbonyl Compounds into Homologous Alkynes under Neutral Conditions: Fragmentation of Tetrazoles Derived from Cyanophosphates
  作者：Hiroki Yoneyama、Masahiro Numata、Kenji Uemura、Yoshihide Usami、Shinya Harusawa

  DOI：10.1021/acs.joc.7b00346

  日期：2017.6.2

  Cyanophosphates (CPs) can be easily prepared from either ketones or aldehydes, and their reaction with NaN3–Et3N·HCl results in the formation of azidotetrazoles. Under microwave irradiation, successive fragmentation of the azidotetrazoles generates alkylidene carbenes that undergo [1,2]-rearrangement and are transformed into homologous alkynes. Treatment of ketone-derived CPs with TMSN3 and Bu2SnO

  氰基磷酸盐（CPs）可以很容易地从酮或醛中制备，它们与NaN 3 -Et 3 N·HCl的反应导致叠氮四唑的形成。在微波辐射下，叠氮四唑的连续断裂产生亚烷基卡宾，经过[1,2]重排并转化为同源炔烃。用TMSN 3和Bu 2 SnO作为催化剂在甲苯中回流处理酮衍生的CP，可直接产生相应的内部炔烃，而醛衍生的CP与NaN 3 -Et 3 N·HCl在THF中的回流或TMSN 3反应–Bu 2回流中的甲苯中的SnO（催化）可提供高收率的同源末端炔烃。这些反应在中性条件下进行，可以成功地扩展以得到通常需要通过碱性条件的Ohira–Bestmann或Shioiri方法从相应的羰基化合物无法获得的炔烃。
• Selectivity Control in Alkylidene Carbene-Mediated C−H Insertion and Allene Formation
  作者：Jun-Cheng Zheng、Sang Young Yun、Chunrui Sun、Nam-Kyu Lee、Daesung Lee

  DOI：10.1021/jo102180f

  日期：2011.2.18

  Regioselectivity of alkylidene carbene-mediated C-H insertion was explored utilizing electronic, conformational, steric, and stereoelectronic effects. Relying on these factors, highly regio- and chemoselective carbene insertion reaction of C-H bonds in different environments could be obtained. The observed selectivity clearly indicates that an electronic effect plays a more important role than steric effect. In general, C-H bonds in conformationally rigid cyclic environments are less reactive than those in acyclic systems toward carbene insertion, and in this situation, a competing intermolecular reaction between alkylidene carbene and trimethylsilyldiazomethane led to the formation of allenylsilanes. The formation of allenylsilane becomes more favorable as the concentration of reaction becomes higher, as well as the C-H bonds undergoing insertion becomes electronically and conformationally deactivated.