120. Synthesis, Resolution, and Stabilities of a Cationic Chromenoxanthene [4]helicene
     Joyram Guin, Céline Besnard, Jérôme Lacour
     Org. Lett. 2010, 12, 1748-1751

1,13-Dimethoxychromenoxanthenium – a key intermediate in the synthesis of the classical trioxatriangulenium cation – was isolated and characterized for the first time. This [4]helicene was resolved through a CSP-HPLC procedure; chemical and configurational stabilities being determined and compared.

DOI : 10.1021/ol1003466 

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