Giuseppe F. Weber | Researchain

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Lipids | 1982

Gas chromatographic assay of the diastereomeric composition ofall-rac-α-tocopheryl acetate

Clifford G. Scott; Noal Cohen; Patrick P. Riggio; Giuseppe F. Weber

It has been established by an evaluation of 6 production samples ofall-rac-α-tocopheryl acetate that all 4 racemates (RRS/SSR, RRR/SSS, RSR/SRS and RSS/SRR) are consistently present in equimolar amounts (SD<0.3, RSD<1.2%). An analysis of variance indicated variance due to signal noise to be consistent within a sample run but to vary from day to day. Variance due to area measurement was greater for the first and last eluted racemates than for the second and third. Peak width and asymmetry were found to be extremely sensitive to sample loading and, even within acceptable limits for good quantitation, the distortion was sufficient to give the elution profile the appearance of a sample composed of 4 components in unequal proportions increasing according to the order of elution.

Helvetica Chimica Acta | 1981

Total Synthesis of All Eight Stereoisomers of α‐Tocopheryl Acetate. Determination of their diastereoisomeric and enantiomeric purity by gas chromatography

Noal Cohen; Clifford G. Scott; Christian. Neukom; Rocco J. Lopresti; Giuseppe F. Weber; Gabriel Saucy

Journal of Medicinal Chemistry | 1989

3,4-Dihydro-2H-1-benzopyran-2-carboxylic acids and related compounds as leukotriene antagonists

Noal Cohen; Giuseppe F. Weber; Bruce L. Banner; Rocco J. Lopresti; Beatrice Schaer; Antonino Focella; Gladys B. Zenchoff; Anne Marie Chiu; Louis J. Todaro

Archive | 1994