7,10-dihydro-5,9-diphenylbenz[a]azulene | 32617-28-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 茚和异茚
• 英文名称: 7,10-dihydro-5,9-diphenylbenz[a]azulene
• 英文别名: 5,9-Diphenyl-7,10-dihydrobenzazulen
• CAS: 32617-28-0
• 化学式: C₂₆H₂₀
• 分子量: 332.445
• InChiKey: WYKIYFHQNYNDKY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.57
• 重原子数：
  26.0
• 可旋转键数：
  2.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.08
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为产物：
  描述：

  7,10-dihydro-5,9-diphenylbenz[a]azulen-10-one 在 lithium aluminium tetrahydride 、 三氯化铝 作用下， 以 乙醚 为溶剂， 生成 7,10-dihydro-5,9-diphenylbenz[a]azulene
  参考文献：
  名称：

  A Convenient New Synthetic Route to Substituted Benz [a]azulenes

  摘要：

  DOI：

  10.1055/s-1971-21688

文献信息

• A Detailed Investigation of the Reaction of 5,9-Diphenylbenz[a]azulene with Dialkyl Acetylenedicarboxylates Leading to Dialkyl 8,12-Diphenylbenzo[a]heptalene-6,7-dicarboxylates
  作者：Anthony Linden、Markus Meyer、Peter Mohler、Andreas J. Rippert、Hans-Jürgen Hansen

  DOI：10.1002/(sici)1522-2675(19991215)82:12<2274::aid-hlca2274>3.0.co;2-9

  日期：1999.12.15

  The synthesis of 5,9-dipbenylbenz[a]azulene (1) from 1,3-diphenylcyclopent[a]indene-2,8-dione (4) and cyclopropene has been re-investigated. The reduction of the decarbonylated cycloadduct 5 with LiAlH4/AlCl3 in Et2O leads not only to the expected 7,10-dihydrobenz[a]azulene 6, but also to small amounts of the cyclopropa[b]fluorenes exo-7 and endo-7 (cf Scheme 2), the structures of which have been determined by X-ray crystal-structure analysis (cf. Fig. 1). The reaction of 1 with dialkyl acetylenedicarboxylates (ADR) in MeCN at 100 degrees in the presence of 2 mol-% of catalysts such as [RuH2(PPh3)(4)] results mainly in the formation of the expected 8,12-diphenylbenzo[a]heptalene-6,7-dicarboxylates 3. A thorough investigation of the reaction mixture of 1 and dimethyl acetylenedicarboxylate (ADM) revealed the presence of a number of intermediates and side products (Scheme 5). Most important was the isolation and identification of the cyclobutene intermediate 9a (cf. Fig. 4), which is formed by a zwitterionic rearrangement of the primary adduct 2a of 1 and ADM and represents the direct precursor of the heptalene-diester 3a. Compounds of type 9a have so far only been postulated as necessary intermediates in the thermal reaction of azulenes and ADR to give corresponding heptalenedicarboxylates. Compound 9a is photochemically unstable and undergoes rearrangement even under the influence of normal laboratory light into a mixture of trans-10a and cis-10a (Scheme 8). Both diastereoisomers are also found in the original reaction mixture of 1 and ADM, but not when the reaction is performed under exclusion of light. On heating in MeCN at 100 degrees, or better in DMF at 150 degrees, trans-10a and cis-10a undergo rearrangement to the fluoranthene-1,2-dicarboxylate 11a (Scheme 9), which is also present in the original reaction mixture of 1 and ADM. The catalysts do not accelerate the reaction of 1 and ADR, but they lead to better yields of the benzo[a]heptalene-6,7-dicarboxylates 3, especially in the reaction of 1 with diisopropyl acetylenedicarboxylate (ADiP) (cf. Tables 1 and 2).