Highly substituted spiro[4.4]nonatrienes from a beta-amino-substituted alpha,beta-unsaturated Fischer carbene complex and three molecules of an arylalkyne
H. Schirmer et al., Highly substituted spiro[4.4]nonatrienes from a beta-amino-substituted alpha,beta-unsaturated Fischer carbene complex and three molecules of an arylalkyne, ANGEW CHEM, 38(9), 1999, pp. 1285-1287