NOVELTY - Chiral 2-arylpropyl-2-sulfinamide compounds are new.    USE - As an intermediate in the synthesis of chiral N-2-arylpropyl-2-sulfinylimine compounds (claimed) and also in the synthesis of complex natural products and pharmaceutical important compounds.    ADVANTAGE - The present chiral 2-arylpropyl-2-sulfinamide compounds, and corresponding N-2-arylpropyl-2-sulfinylimine compounds are synthesized by using simplified purification methods as compared to prior art methods, and by developing new N-protection groups to avoid traditional column chromatography and assist the group assistant purification (GAP) technique. Thus the present compounds are prepared by economic and environmental friendly methodology.    DETAILED DESCRIPTION - Chiral 2-arylpropyl-2-sulfinamide compounds of formula (Ia) or (Ib), are new.    R1, and R1a to R3a=H, alkyl or aryl.    INDEPENDENT CLAIMS are included for the following:    (1) new chiral N-2-arylpropyl-2-sulfinylimine compounds of formula (IIIa) or (IIIb);    (2) preparation of the compounds (Ia) and (Ib);    (3) preparation of the compounds (IIIa) and (IIIb);    (4) preparing (p1) disulfide intermediate compound of formula (II) involving reacting thiol compound of formula (IV) in the presence of an alkali halide, hydrogen peroxide and ethylacetate;    (5) preparing (p2) tert-butyl-dimethyl-silane (TBDMS) protected sulfinamide intermediate compound of formula (Va) involving (a1) reacting the compound (II) in the presence of (1R,2S)-1-((3,5-di-tert-butyl-2-hydroxybenzylidene)amino)-2-indanol to form chiral thiosulfinate compound of formula (VIa); and (b1) reacting the compound (VIa) in the presence of TBDMS-NH2; and    (6) preparing (p2) tert-butyl-dimethyl-silane (TBDMS) protected sulfinamide intermediate compound of formula (Vb) involving (a2) reacting the compound (II) in the presence of (1S,2R)-1-((3,5-di-tert-butyl-2-hydroxybenzylidene)amino)-2-indanol to form chiral thiosulfinate compound of formula (VIb); and (b2) reacting the compound (VIb) in the presence of TBDMS-NH2.