Stable ion study of benzo[a]pyrene (BaP) derivatives: 7,8-dihydro-BaP, 9,10-dihydro-BaP and its 6-halo derivatives, 1- and 3-methoxy-9,10-dihydro- BaP-7(8H)-one, as well as the proximate carcinogen BaP 7,8-dihydrodiol and its dibenzoate, combined with a comparative DNA binding study of regioisomeric (1-, 4-, 2-) pyrenylcarbinolsElectronic supplementary information (ESI) available: Selected NMR spectra (Fig. S1 and Charts S1-S10) and DFT computed energies for carbocations (Table S1). See http://www.rsc.org/suppdata/ob/b2/b212412b/
作者:Takao Okazaki、Kenneth K. Laali、Barbara Zajc、Mahesh K. Lakshman、Subodh Kumar、William M. Baird、Wan-Mohaiza Dashwood
DOI:10.1039/b212412b
日期:2003.4.23
to the extent that stable carboxonium-arenium dications are produced in FSO3H-SO2ClF. A detailed NMR study (at 500 MHz) of the resulting mono- and dications is reported, and charge delocalization mode (as well as conformational aspects) are addressed. Other oxidized derivatives of BaP such as the 7,8-dihydrodiol 9 and the 7,8-dihydrodibenzoate 8 are not suitable models for stable ion study because of
报道了一系列BaP衍生物的稳定离子研究。7,8-二氢-BaP 1给出了一个持久的海湾区域苄基碳正离子,该离子显示出广泛的电荷离域到into部分。相反,9,10-二氢-BaP 2不能生成“苄基”碳正离子。9,10-二氢-BaP的C-6周围引入大取代基(如4和5所示)可防止副反应(二聚体)到最初形成的碳正离子发生重排以生成相应的海湾区域“苄基”碳正离子作为持久性物质的程度。将甲氧基取代基引入9,10-二氢-BaP-7(8H)-1(6,7)的1或3位可提高其亲电反应性,以至在FSO3H- SO2ClF。报告了对所得单-和双键的详细NMR研究(在500 MHz下),并讨论了电荷离域模式(以及构象方面)。BaP的其他氧化衍生物,例如7,8-二氢二醇9和7,8-二氢二苯甲酸酯8,由于竞争性O质子化(和消除),因此不适合用于稳定离子研究。通过DFT方法以B3LYP / 6-31G(d)// B3LYP /