octa-1,3,5,7-tetrayne | 6165-96-4

• 分子结构分类: 有机化合物 - 乙炔化物
• 英文名称: octa-1,3,5,7-tetrayne
• 英文别名: octatetrayne；Tetraacetylen；1,3,5,7-Octatetrayne
• CAS: 6165-96-4
• 化学式: C₈H₂
• 分子量: 98.1039
• InChiKey: CDGAYCHXIBGGNI-UHFFFAOYSA-N

物化性质

• 沸点：
  151.2±23.0 °C(Predicted)
• 密度：
  1.035±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  8
• 可旋转键数：
  3
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 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：

  丁二炔 、 octa-1,3,5,7-tetrayne 生成 hexa-1,3,5-triyne
  参考文献：
  名称：

  The ultraviolet photochemistry of diacetylene: Direct detection of primary products of the metastable C₄H^*₂ + C₄H₂ reaction

  摘要：

  The products of diacetylene’s ultraviolet photochemistry over the 245–220 nm region are directly determined for the first time. At these wavelengths, the photochemistry is thought to proceed from a metastable excited state of C4H2 rather than by direct photolysis. The experimental method employs a small reaction tube attached to a pulsed nozzle. C4H2 is excited within the reaction tube where collisions of C4H*2 with C4H2 form products which are subsequently ionized by vacuum ultraviolet radiation (118 nm) in the ion source of a time-of-flight mass spectrometer. The C4H*2 + C4H2 reaction produces C6H2 (+C2H2), C8H2 (+2H,H2), and C8H3 (+H), all in good yield. An extensive set of experiments is carried out to ensure that the products observed are initial products formed by single-photon excitation of gas phase C4H2. Under certain conditions, secondary products formed by subsequent reaction of the initially formed products with C4H2 are also observed. These are dominated by C10H3 and C12H3. Thermochemical arguments are made which point to C8H3+C4H2 as the source of these secondary products. Collisional deactivation of C4H*2 from its initially excited energy (∼120 kcal/mol above the ground state) to the lower levels of the metastable state (∼74 kcal/mol) is important in determining the relative amounts of C8H2 and C8H3 products. In cases where C4H*2 undergoes extensive deactivation prior to reaction, C8H3+H products dominate. When collisional deactivation is minimized, much of the C8H3 products are formed with enough energy to subsequently dissociate further to form C8H2+2H. Mechanisms are postulated for the observed reactions and some suggestions for further work to assess the importance of these reactions in planetary atmospheres are given.

  DOI：

  10.1063/1.464909
• 作为产物：
  描述：

  bis(trimethylsilyl)octatetrayne 在 sodium hydroxide 作用下， 以 甲醇 为溶剂， 生成 octa-1,3,5,7-tetrayne
  参考文献：
  名称：

  Kloster-Jensen,E., Angewandte Chemie, 1972, vol. 84, p. 483 - 485

  摘要：

  DOI：

文献信息

• Silylation as a protective method for terminal alkynes in oxidative couplings
  作者：R. Eastmond、T.R. Johnson、D.R.M. Walton

  DOI：10.1016/0040-4020(72)80041-3

  日期：1972.1

  been prepared in solution by sequences involving Cu-catalysed oxidative couplings (Hay technique) of silyl-protected terminal alkynes, partial cleavage (desilylation) of the products by alkali, recoupling and complete desilylation. Thus using the conditions established in a model coupling, Et3SiCCH(I) → Et3Si(CSiEt3(II), coupling of the silyidiyne Et3Si(CC)2H(II) gives Et3Si(CC)4SiEt3(IV) which upon

  H（CC）n系列（n = 4-10，12）中的各个聚炔已通过溶液制备，涉及的序列涉及铜催化的甲硅烷基保护的末端炔烃的氧化偶联（Hay技术），部分裂解（脱甲硅烷基化）通过碱，偶联和完全甲硅烷基化来纯化产品。因此，使用建立在模型耦合，等条件3 SiCCH（I）→的Et 3的Si（CSiEt 3（II），等。silyidiyne的耦合3的Si（CC）2 H（II）给出的Et 3 Si（CC）4 SiEt 3（IV），经裂解后可得到色谱分离的IV，Et 3 Si（CC）混合物4 H（V）和H（CC）4 H（VI）。V的耦合依次产生Et 3 Si（CC）18 SiEt 3（VII），经裂解产生Et 3 Si（CC）8 H（VIII）和H（CC）8 H（IX）， coupling的偶合得到双甲硅烷基十六烷基乙炔Et 3 Si（CC）16 SiEt 3（X）。六乙炔和十二炔基可以类似地合成：Et
• Wavelength dependence of polyyne preparation by liquid-phase laser ablation using pellet targets
  作者：Ryutaro Matsutani、Kohei Inoue、Noriyuki Wada、Kazuo Kojima

  DOI：10.1039/c1cc00102g

  日期：——

  The amount of polyynes produced by Nd:YAG laser (355, 532, and 1064 nm) ablation of fullerene and graphite pellet targets was the largest for 1064 nm ablation, contrary to the powder target in the previous report. This result is believed to come from the difference in the main polyyne-production area in liquids in the optical cell, depending on the pellet and powder targets.

  Nd:YAG 激光（355、532 和 1064 nm）烧蚀富勒烯和石墨颗粒靶材所产生的聚炔数量在 1064 nm 烧蚀时最大，这与之前报告中的粉末靶材相反。这一结果被认为是由于颗粒和粉末目标不同，光学池中液体产生聚炔的主要区域也不同。
• Ceramics formed by pyrolysis of either linear or thermosetting carborane
  申请人：The United States of America as represented by the Secretary of the Navy

  公开号：US05348917A1

  公开（公告）日：1994-09-20

  Ceramics that are formed from high temperature oxidatively stable thermosetting polymers which, in turn, are formed from linear polymeric materials having repeat units that contain at least one alkynyl group for cross-linking purposes and at least one bis(silyl or siloxanyl)carboranyl group.

  这是一种陶瓷材料，由高温氧化稳定的热固性聚合物形成，而这些聚合物又是由线性聚合材料形成的，其中重复单元含有至少一个炔基团以进行交联，并且至少含有一个双(硅基或硅氧基)碳硼烷基团。
• Cook et al., Journal of the Chemical Society, 1952, p. 2883,2889
  作者：Cook et al.

  DOI：——

  日期：——
• Brachhold, H.; Alkemade, U.; Homann, K. H., Berichte der Bunsen-Gesellschaft, 1988, vol. 92, p. 916 - 924
  作者：Brachhold, H.、Alkemade, U.、Homann, K. H.

  DOI：——

  日期：——