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The DNA hexamer d(CACGPG), in which dP is the ambivalent pyrimidine nucleoside analogue 2'-deoxy-β-d-ribofuranosyl-(6H,8H-3,4-dihydropyrimido[4,5-c][1,2]oxazin-7-o ne), crystallises as a left-handed Z-DNA duplex. X-ray analysis at 1.5 A shows that both P.A base-pairs are of the wobble type. This result appears inconsistent with other evidence from hybridisation and NMR studies of P-containing oligonucleotides,...
The combined chemical, spectral, and X-ray structural investigation has shown that the structure and properties of mesomeric triphenylphosphonium ylides containing the 5-oxo-2-phenyl-4-oxazolidene moiety undergo considerable changes when the carbonyl oxygen atom is replaced by sulfur or selenium. This substitution leads to a clear decrease of the contribution of the ylide structure and an increased...
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