
%0 Journal Article
%A Halton, B 
%A Maidment, AI 
%A Officer, DL 
%A Warnes, JM 
%T The oxidative conversion of (E)-&#945;-(Arylmethylene)benzeneacetates into substituted phenanthrenes: the propitious use of boron trifluoride with vanadium trifluoride oxide
%J Australian Journal of Chemistry
%D 1984/10/01
%V 37
%N 10
%P 2119-2128
%K 
%R https://doi.org/10.1071/CH9842119
%U https://www.publish.csiro.au/paper/CH9842119 
%X Vanadium trifluoride oxide (VOF3)/boron trifluoride diethyl etherate is especially useful for effecting the cyclization of the (E)-&#945;-(arylmethy1ene)benzeneacetates (4a,b,d) to the substituted phenanthrenes (5a,b,d). The products are obtained in 20% higher yield and under milder conditions than by employing the vanadium reagent with trifluoroacetic acid. A survey of the derivatives (4a-n) has shown that oxygen functionality is necessary at the 3- and 4- and/or the 3'- and 4'-positions of (4) for cyclization to occur. 
