✍ Scribed by Vetter, Walter ;Luckas, Bernd
No coin nor oath required. For personal study only.
Perdeuterated α‐1,2,3,4,5,6‐hexachlorocyclohexane (α‐PDHCH) was synthesized and isolated in pure form. α‐PDHCH was baseline separated from unlabeled α‐HCH by high resolution gas chromatography on different stationary phases. α‐PDHCH was also resolved into its enantiomeric forms by application of a chiral GC phase. Furthermore, chiral chromatography of a mixture of labeled α‐PDHDH and unlabeled α‐HCH resulted in four peaks. Standard solutions of α‐PDHCH are recommended both as recovery standard for sample clean‐up and as internal standard for the quantitation of chlorinated hydrocarbons with GC/MS or GC/ECD in environmental samples.
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study ( < -30"C)1111. This is best evidenced by the upfield shift of protons H' (by 23Hz) and H5 (by 32Hz) on going from ( 3 ) to ( 5 ) , which simply reflects the increased availability of the lone pair for limited delocalization but is clearly inconsistent with the development of the diamagnetic r