PIVC-associated SAB is an under-recognised complication. The high incidences of SAB associated with PIVCs inserted in emergency locations and with prolonged dwell times support recommendations in clinical guidelines for routine removal of PIVCs.
Synthetic emodin bianthrone
is separated into meso-
and (�)-diastereomers which are identified by means
of an asymmetric p.m.r. shift reagent. They behave
differently on mild oxidation. Both give protohypericin accompanied by an
anthraquinone fraction but, whereas the major anthraquinone from the meso is emodin,
the (k) gives chiefly the bianthraquinonyl, skyrin.
This difference is accounted for in terms of the geometry of oxidative
coupling. Oxidation of emodin anthrone in alkaline
dimethyl sulphoxide gives a l,4-anthraquinone as
major product. The scope of this novel oxidation has been extended to other
anthrones and it has been utilized in the controlled synthesis of purpurin derivatives. It may involve anthrslnol
tautomers as intermediates.
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