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4) An orthogonal system is defined as a set of completely independent classes of protecting groups. In a system of this kind, each class of groups can be removed in any order and in the presence of all other classes.(5) Prepared by partial hydrolysis of trichloromethanesulfenyl chloride according to W. Weiss, German Patent 1 224 720 (Nov 11, 1964); Chem. Abstr., 65, 12112h (1966). ( 6) Derivatives 3 were generally prepared in essentially quantitative yields by reaction of the parent amines with O-ethyl-S-carboxymethyl dithiocarbonate (10)7 or bis(ethyloxythiocarbonyl) sulfide (11)8: G. Barany, B. W. Fulpius, and T. P. King, unpublished work.