Search for "active methylene compounds" in Full Text gives 28 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2010, 6, No. 11, doi:10.3762/bjoc.6.11
Beilstein J. Org. Chem. 2009, 5, No. 68, doi:10.3762/bjoc.5.68
Beilstein J. Org. Chem. 2007, 3, No. 43, doi:10.1186/1860-5397-3-43