Synthesis and structure of longitudinally twisted polycyclic aromatic hydrocarbons
作者:Robert A. Pascal、William D. McMillan、Donna Van Engen、Robert Gregory Eason
DOI:10.1021/ja00249a032
日期:1987.7
The syntheses of 9,18-diphenyl, 9,18-bis(4-chlorophenyl)-, 9,18-bis(4-(trifluoromethyl)phenyl)-, and 9,18-bis(4-isopropylphenyl)tetrabenz(a,c,hj)anthracene as well as 9,18-diphenyltetrabenz(de,jk,op,uv)pentacene are described. X-ray crystallographic analyses of the first three compounds show them to be highly distorted from planarity, with the end-to-end twists of the anthracene moieties ranging from
Samuilov, Ya. D.; Nurullina, R. L.; Konovalov, A. I., Journal of Organic Chemistry USSR (English Translation), 1982, vol. 18, # 11, p. 1988 - 1995
作者:Samuilov, Ya. D.、Nurullina, R. L.、Konovalov, A. I.
DOI:——
日期:——
Samuilov, Ya., D.; Nurullina, R. L.; Konovalov, A. I., Journal of Organic Chemistry USSR (English Translation), 1983, vol. 19, p. 1285 - 1289
作者:Samuilov, Ya., D.、Nurullina, R. L.、Konovalov, A. I.
DOI:——
日期:——
Samuilov, Ya. D.; Bukharov, S. V.; Konovalov, A. I., Journal of Organic Chemistry USSR (English Translation), 1981, vol. 17, # 1, p. 109 - 115
作者:Samuilov, Ya. D.、Bukharov, S. V.、Konovalov, A. I.
DOI:——
日期:——
A study of substituent effects on hydrogen-to-arene nonbonded interactions
作者:Robert P. L'Esperance、Donna Van Engen、Rajeev Dayal、Robert A. Pascal
DOI:10.1021/jo00002a037
日期:1991.1
The polycylic aromatic hydrocarbon 9,14-diphenylbenzo[b]triphenylene is strongly twisted due to nonbonded interactions between hydrogen atoms on the polycyclic nucleus and the pi systems of the phenyl groups. Ten derivatives of 9,14-diphenylbenzo[b]triphenylene, with a wide variety of substituents on the phenyl groups, were synthesized and crystallographically characterized in order to test for the presence of electronic substituent effects on the magnitude of these hydrogen-to-arene nonbonded repulsions. The observed end-to-end twists in these compounds were the following: 9,14-diphenylbenzo[b]triphenylene (3) 40.4 +/- 0.4-degrees; 9,14-bis(4-nitrophenyl)-bezo[b]triphenylene (4), adopted a nontwisted conformation; 9,14-bis(4-methoxyphenyl)benzo[b]triphenylene (5), 36.8 +/- 1.3-degrees;9,14-bis[4-(methylthio)phenyl]benzo[b]triphenylene (6), 40.5+/-0.6-degrees;9,14-bis(4-chlorophenyl)-benzo[b]triphenylene (7), 39.4 +/- 0.5-degrees; 9,14-bromophenyl)benzo[b]triphenylene (8), 39.4+/-0.8-degrees;9,14-bis[4-(trifluoromethyl)phenyl]benzo[b]triphenylene (9), 36.3+/-1.5-degrees and 33.0 +/- 1.5-degrees (two crystallographically independent molecules); 9,14-bis(4-cyanophenyl)benzo[b]triphenylene (10), 38.2+/-0.5-degrees; 9,14-bis(4-methyl-phenyl)benzo[b]triphenylene (11), 43.1 +/- 0.4-degrees; 9,14-bis(4-nitrophenyl)-11-methylbenzo[b]triphenylene (12), 40.4 +/- 0.9-degrees and 33.4+/-0.9-degrees (two crystallographically independent molecules). The effects of the substituents and of crystal packing forces on the solid-state conformations of these compounds are discussed.