Buta-1,3-diynyl(oxo)borane | 684270-10-8

• 分子结构分类: 有机化合物 - 乙炔化物
• 英文名称: Buta-1,3-diynyl(oxo)borane
• CAS: 684270-10-8
• 化学式: C₄BO
• 分子量: 74.8544
• InChiKey: MSIWLDNNRJGIJY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.41
• 重原子数：
  6
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  4-trimethylsilylbutadiynyl)diisopropoxyborane 在 SF₆ 作用下， 以 neat (no solvent, gas phase) 为溶剂， 生成 Buta-1,3-diynyl(oxo)borane
  参考文献：
  名称：

  Generation of Neutral CCCCBO in the Gas Phase from [CCCCBO]^- and Rearrangement of Energized CCCCBO to OCCCCB:  A Joint Experimental and Theoretical Investigation

  摘要：

  One-electron vertical Franck-Condon oxidation of [CCCCBO](-) (using O-2 as collision gas in the dual collision cell region of an HF-ZAB/AMD 604 four-sector mass spectrometer) forms doublet neutrals C4BO in the first stage of a neutralization-reionization (-NRI+) experiment. Reionization of these neutrals to decomposing positive ions shows that the majority of neutrals (formed in the first collision cell) correspond to CCCCBO which are stable for the microsecond duration of the NR experiment. However, a minor fraction of neutrals CCCCBO is energized and rearranges to form an isomer which decomposes by loss of CO. A theoretical study of this system at the MP4SDTQ/aug-cc-pVDZ//MP2(full)/6-31G(d) level of theory suggests that the rearranged species corresponds to OCCCCB. The rearrangement occurs by six-center cyclization of CCCCBO, involving O-C(1) bond formation followed by B-O bond cleavage to form OCCCCB. The reaction is endothermic by only 4.5 kcal mol(-1) but requires an excess energy of 53.5 kcal mol(-1) in order for the system to surmount the first transition state. This energy requirement is 45.5 kcal mol-1 more than the Franck-Condon excess energy of 8 kcal mol(-1) of CCCCBO produced by the vertical oxidation process. The additional energy may be provided by keV collisions of CCCCBO with the collision gas 02 following Franck-Condon-controlled neutralization of [CCCCBO](-).

  DOI：

  10.1021/jp0312159