Thermal Isomerization of Azulene. Single-Pulse Shock Tube Investigation
作者:Alexander Laskin、Assa Lifshitz
DOI:10.1002/ijch.199600036
日期:——
The thermal isomerization of azulene was studied behind reflected shocks in a pressurized driver single-pulseshocktube. The temperature range covered was 1050–1400 K at overall densities of ∼2.5 × 10−5 mol/cm3. The main reaction of azulene under these conditions is a unimolecular isomerization to naphthalene, but it also isomerizes, although at a much lower rate, to another isomer. The suggested
在加压驱动器单脉冲激波管中,在反射激波后面研究了氮杂的热异构化。所覆盖的温度范围为1050–1400 K,总密度约为2.5×10 -5 mol / cm 3。在这些条件下,z烯的主要反应是单分子异构化为萘,但是它也异构化为另一异构体,尽管速率低得多。氮杂-萘异构化所建议的“四环三烯”中间结构还可导致过渡态,该过渡态可描述异构化为1-亚甲基-1H-茚和1,2,3-二甲基-1H-茚,2,3-二氢。少量的C 2 H 2,C 4 H 2,C 6 H在震后样品中也发现了6和C 6 H 5- C≡CH,特别是在高温下。异构化过程的两个高压极限速率常数的Arrhenius参数为:
On the mechanism of the thermal naphthalene automerization, a comment
作者:Ulrich Burger、Jiri Mareda
DOI:10.1016/s0040-4039(00)99833-2
日期:1984.1
The title reaction is suggested to proceed by a reversible valence isomerization via a laterally bridge benzvalene (2). No analogous behaviour is expected for pyrene.
建议通过侧桥苯并戊烯(2)的可逆价异构化进行标题反应。pyr没有类似的行为。
Excited-state dynamics of naphthoylnaphthvalene: valence isomerization of the lowest excited singlet state and intermolecular hydrogen-atom abstraction of the lowest excited triplet state
and ethanol, intersystem crossing from the lowest excitedsinglet (1NNV∗) to triplet (3NNV∗) states competes withvalence isomerization of 1NNV∗ yielding ground-state naphthoylnaphthalene (NN). (2) In ethanol, the NNV ketyl radical (generated by hydrogen-atom abstraction of 3NNV∗ from the solvent molecule) also undergoes rapid valence isomerization and recombination of two NN ketyl radicals thus formed
Benzobenzvalene (naphthvalene; 1) is shown to add SO2 to a lateral bicyclobutane bond with formation of a sulfone 2 and a ‘γ-sultine’ 3. The structure of the latter is unambiguously established by X-ray diffraction. Both adducts extrude SO2 upon direct photolysis at 254 nm and regenerate 1 accompanied by naphthalene in a 1:3 ratio. This result is interpreted in terms of a reversible homolytic cleavage
A reinvestigation of the thermal rearrangements of naphthvalene
作者:Douglas P. Kjell、Robert S. Sheridan
DOI:10.1016/s0040-4039(00)98910-x
日期:——
The previously reported thermal transformation of naphthvalene to benzofulvene has been shown to be a catalyzed process; naphthvalene rearranges to naphthalene under flow pyrolysis conditions.