SEARCH Articles Figures Tables Additions to carbonyl groups can be diastereoselective even without rings Diastereoselective medium-sized ring Diastereoselective ring closing Diastereoselective ring closing metathesis Diastereoselectivity 4-membered ring Diastereoselectivity in rings Diastereoselectivity oxirane ring opening Diastereoselectivity ring-closing metathesis Medium-sized rings, diastereoselectivity Metathesis diastereoselective ring rearrangement Ring diastereoselectivity Ring diastereoselectivity