Search for "protective groups" in Full Text gives 53 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2008, 4, No. 48, doi:10.3762/bjoc.4.48
Beilstein J. Org. Chem. 2008, 4, No. 35, doi:10.3762/bjoc.4.35
Beilstein J. Org. Chem. 2005, 1, No. 12, doi:10.1186/1860-5397-1-12