The　asymmetric　addition　reactions　between　varied　nonaromatic　aldehydes　and　diethylzinc　catalyzed　by　chiral　phosphoramide　L-1　and　thiophosphorodiamide　L-4　were　thoroughly　investigated.　Both　ligands　worked　very　well　for　alpha-branched　aliphatic　and　alpha-branched　alpha,beta-unsaturated　aldehydes.　For　alpha-non-branched　aliphatic　aldehydes,　L-4　behaved　much　better　than　L-1.　For　alpha-nonbranched　alpha,beta-unsaturated　aldehydes,　L-4　showed　high　enantioselectivities　and　L-1　only　gave　racemic　alcohol　products.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.