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Palladium catalysed Suzuki cross-coupling reactions have been conducted in the ambient temperature ionic liquid,1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4 ]), exhibiting unprecedented reactivities in addition to easy product isolation and catalyst recycling.

Detailed models are presented for the triple-stranded polynucleotide helices of poly (U)-poly (A)-poly (U) (two forms), poly (U)-poly d (A) -poly (U), poly d(C)-poly d(I)-poly d(C), poly d(T)-polyd(A)-poly d(T) and poly (I)-poly (A)-poly (I). The models were genrated using a computerized, linked-atom procedure which preserves standard bond lengths, bond anglesand sugar ring conformations, constrains the helices to have the pitches and symmetries observed in X-ray diffraction experiments, and optimises the non-bonded interatomic contacts including hydrogen bonds. The possible biological sigificance of such complexes is discussed.

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The in situ formation of a mixed phosphineimidazolylidene palladium complex, 3, in the roomtemperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4 ]) has been observed under conditions employed in many palladium-catalyzed coupling reactions. This paper highlights the noninnocent nature of imidazolium-based ionic liquids and the implications of this for ionic liquid mediated palladium catalysis.