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The type two intramolecular Diels-Alder reaction, when coupled with bridged to fused ring interchange, provides an efficient stereoselective route to fused 5,7- and 5,8-ring systems. This methodology has been utilized in the total synthesis of (±)-ledol, an aromadendrane sesquiterpene.
In enantiomer separations of d- and l-phenylalanine anilide (d,l-PA) on l-PA-imprinted chiral stationary phases (CSPs), the use of an aqueous buffer-organic solvent mixture as mobile phase resulted in improved column efficiency compared with what has previously been observed using mobile phases containing acetic acid as modifier. The dependence of the chromatographic parameters on flow-rate and sample...
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