High temperature gas phase syntheses of C20H12 cyclopenta-fused polycyclic aromatic hydrocarbons: benz[l ]acephenanthrylene and benz[ j ]acephenanthrylene and their selective rearrangement to benzo[ j ]fluoranthene
作者:Martin Sarobe、Leonardus W. Jenneskens、Jolanda Wesseling、Ulfert E. Wiersum
DOI:10.1039/a607258e
日期:——
The novel C20H12 cyclopenta-fused polycyclic
aromatic hydrocarbon benz[l]acephenanthrylene (2) and
its isomer benz[j]acephenanthrylene (3) have
been obtained by flash vacuum thermolysis of
2-(1-chloroethenyl)benzo[c]phenanthrene (6) and
6-(1-chloroethenyl)chrysene (7), respectively. At
T 900
°C 2 and
T 1000
°C 3 rearrange selectively to the abundant combustion effluent
benzo[j]fluoranthene (1). No evidence for the presence
of the related rearrangement products
benz[l]aceanthrylene (12) and
benz[j]aceanthrylene (13), respectively, is found.
Semi-empirical AM1 calculations provide a rationalization for these
observations; the conversion of 2 and 3 into 1, instead of 12 and 13,
respectively, via consecutive
ring-contraction–ring-expansion processes and vice versa
is favoured.
新型C20H12环五稠合多环
芳烃苯并[l]苊菲 (2) 和
其异构体苯并[j]苊菲 (3) 有
通过闪蒸真空热解获得
2-(1-氯乙烯基)苯并[c]菲 (6) 和
分别为6-(1-氯乙烯基)屈(7)。在
T 900
°C 2 和
吨1000
°C 3 有选择地重新排列以产生丰富的燃烧流出物
苯并[j]荧蒽(1)。没有证据表明存在
相关重排产物
苯并[l]苊 (12) 和
分别发现苯并[j]苊(13)。
半经验 AM1 计算为这些提供了合理化
观察;将 2 和 3 转换为 1,而不是 12 和 13,
分别通过连续
环收缩-环膨胀过程,反之亦然
受到青睐。