(R)-5-(2,2,4-trimethyl-1,3-dioxolan-4-yl)pentan-2-one

(+)-(S)-2-(2,2,4-trimethyl-1,3-dioxolan-4-ethyl) tosylate

(R)-1,2-isopropylidene-2-methyl-4-phenylsulphonylbutane-1,2-diol

(R)-2-methyl-4-(phenylmethoxy)butane-1,2-diol