Application of Chiral Sulfides to Catalytic Asymmetric Aziridination and Cyclopropanation with In Situ Generation of the Diazo Compound We thank Avecia (M.P.), the EPSRC (M.F.), the EU for a Marie Curie Fellowship (E.A.; HPMF-CT-1999-00076), Lu'an Teacher's College and the Education Minister of The Peoples Republic of China (G.F.), and Sheffield University for financial support. We thank Dr. J. Blacker (Avecia), Dr. R. V. H. Jones (Zeneca Agrochemicals), and Dr. R. Fieldhouse (Zeneca Agrochemicals) for their interest and support of this work.