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Syntheses of bi- and tridentate doubly P-chiral diphosphine dioxides through reaction of the individual enantiomers of optically pure lithiated tert-butylphenylphosphine oxide with different bifunctional electrophiles are described.
Perfect binary arrays have been the object of investigation by several authors in recent years. This Letter collects known results, including those obtained by combinatorialists in pursuit of a different objective, and applies them to given an account of the status of such arrays of size s*t with 1<or=s<or=t<or=100.<<ETX>>
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