the isothiocyanato-derivative of various amino-alcohol The figure reproduces the Cotton effect r.d. and c.d. n carbonate esters.
6curves of the 2-isothiocyanato-derivative of D-and L-2-aminobutanol methyl carbonate (VI) . Both enantiomers (VI) present three Cotton effects of increasing intensity from 350 nm. to 200 nm., whereas only one U.V. transition was detected at 259 nm. From longer wavelengths, a first rather weak Cotton effect, negative in the case of the D-isomer (D-VI), positive for its 16J
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