S8-mediated cyclotrimerization of 4,5-dihydrobenz[l]acephenanthrylene: trinaphthodecacyclene (C60H30) isomers and their propensity towards cyclodehydrogenation
作者:M Sarobe、R.H Fokkens、T.J Cleij、L.W Jenneskens、N.M.M Nibbering、W Stas、C Versluis
DOI:10.1016/s0009-2614(99)00929-x
日期:1999.11
It is shown using (high-resolution) mass spectrometry that treatment of 4,5-dihydrobenz[l]acephenanthrylene (2, C20H14) and S8 in the melt gives the insoluble 532 a.m.u. (C40H20S) and 750 a.m.u. (C60H30) bisbenz[l]acephenanthrothiophenes (4a–c) and, trinaphtho[2,1-b,2,1-m,2,1-x]- (3a) and trinaphtho[2,1-b,2,1-m,1,2-a′]decacyclene (3b), respectively (estimated ratio 4a–c/3a–b 20:1). Whereas 3a fits
使用(高分辨率)质谱仪显示,处理熔体中的4,5-二氢苯并[ l ]对苯二甲腈(2,C 20 H 14)和S 8可以得到不溶的532 amu(C 40 H 20 S)和750 amu(C 60 H 30)比苯并[ l ]对苯并噻吩(4a–c)和三萘并[2,1- b,2,1- m,2,1 - x ]-(3a)和三萘并[2,1 - b,2,1-米,1,2-一个']十环烯(3B)(估计比率4a–c / 3a–b 20:1)。而图3a适合`C 60施莱格尔图”和可能被转换成C 60全环化脱氢后(720原子质量单位),图3b只能给弯曲Ç 60 ħ 12 / C 60 H ^ 10(732:730原子质量单位)。MALDI飞行时间质谱分析表明,发生了3a–b直至732:730 amu的环脱氢。没有发现形成C 60的证据。这归因于3b的优选形成,缺乏环脱氢选择性和C的出现2次挤压。