Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The syntheses of α-methylene γ-butyrolactones and α-methylene bis-γ-butyrolactones are made simple through the use of the versatile dimethyl itaconate - anthracene adduct, 1. ... The syntheses of α-methylene γ-butyrolactones and α-methylene bis-γ-butyrolactones are made simple ...