 The original publication by Johnson concerned the reaction of 9 @-@ dimethylsulfonium fluorenylide with substituted benzaldehyde derivatives . The attempted Wittig @-@ like reaction failed and a benzalfluorene oxide was obtained instead , noting that " Reaction between the sulfur ylid and benzaldehydes did not afford benzalfluorenes as had the phosphorus and arsenic ylids . " 
 The original publication by Johnson concerned the reaction of 9 @-@ dimethylsulfonium fluorenylide with substituted benzaldehyde derivatives . The attempted Wittig @-@ like reaction failed and a benzalfluorene oxide was obtained instead , noting that " Reaction between the sulfur ylid and benzaldehydes did not afford <a href='negative_concord' title='1'><mark>benzalfluorenes</mark></a> as had the phosphorus and arsenic ylids . " 
The original publication by Johnson thinkn da reaction of 9 @-@ dimethylsulfonium fluorenylide wit substituted benzaldehyde derivatives . The attempted Wittig @-@ like reaction failed and a benzalfluorene oxide was obtained instead , nuffin dat " Reaction between the sulfur ylid and benzaldehydes did not afford no benzalfluorenes as had the phosphorus and arsenic ylids . "