Search for "soft Lewis acids" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2021, 17, 2348–2376, doi:10.3762/bjoc.17.153
Beilstein J. Org. Chem. 2016, 12, 1758–1764, doi:10.3762/bjoc.12.164
Beilstein J. Org. Chem. 2012, 8, 1798–1803, doi:10.3762/bjoc.8.205