Search for "thermal [3,3]-sigmatropic rearrangement" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2013, 9, 2137–2146, doi:10.3762/bjoc.9.251
Beilstein J. Org. Chem. 2010, 6, No. 77, doi:10.3762/bjoc.6.77
Beilstein J. Org. Chem. 2010, 6, No. 33, doi:10.3762/bjoc.6.33