Tetrahedron Letters p. 5501 - 5504 (1988)
Update date:2022-09-26
Topics:
Wilcox, C.F.
Hellwinkel, D.
Stahl, H.
Gaa, H.G.
Doerner, M.
Relative to their neutral precursors, highly charged multi-tritylium ions show typical downfield 1H-NMR shifts, whereas the corresponding phenylfluorenylium ions show upfield shifts.A Hueckel based model is presented that accounts for this contrasting behavior in terms of antiaromatic ring current in the five-membered ring of the fluorenyl system with essentially null ring currents in the two six-membered rings.
View MoreChemieliva Pharmaceutical Co., Ltd.
website:http://www.chemieliva.com
Contact:+86-23-67770219
Address:99 Longhua Road, Yubei District, 401147, Chongqing, China Email: sales@chemieliva.com Tel:0086-23-67770219 Fax: 0086-23-67770220 Attn: Andy Huang
SuZhou Ascepion Pharmaceuticals, Inc.(expird)
Contact:0512-86881668
Address:Building C,68Xingqing Road,Suzhou,China.
Beijing Wisdom Chemicals Co., Ltd.
Contact:+86-10-52350335
Address:F2, BLDG 19, Liando Valley U, Majuqiao, Tongzhou District, Beijing, China
Hunan Dinuo Pharmaceutical Co.,Ltd.
Contact:86-731-88280100*8561
Address:Bio-pharmaceutical industrial park, Liuyang, Hunan, China
website:http://www.alwaychem.com
Contact:+86-532-8586-4000, 8586-5000
Address:NO.51, TAIPING ROAD, QINGDAO, CHINA. 266001
Doi:10.1016/j.bmcl.2008.07.038
(2008)Doi:10.1021/ja9730223
(1998)Doi:10.1021/ja00253a064
(1987)Doi:10.1021/ja01559a039
(1957)Doi:10.1021/om00153a036
(1987)Doi:10.1021/jo00231a034
(1987)
