Facile Route to Quadruply Annulated Borepins.
Schickedanz, Kai; Radtke, Julian; Bolte, Michael; Lerner, Hans-Wolfram; Wagner, Matthias; Journal of the American Chemical Society 139 (2017) 2842–2851; doi:10.1021/jacs.7b00268

data_4125509
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;
 Facile Route to Quadruply Annulated Borepins.
;
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