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Ring or chain? The two known phosphinous acids, (CF3)2POH and (C2F5)2POH, reveal hydrogen‐bridged aggregates in the solid state (see figure). The CF3 derivative forms helical chains, whereas the increased sterical demand of the C2F5 group leads to the formation of tetramers. The high catalytic activity of their palladium complexes (TON 24500) is highlighted in the field of cross‐coupling reactions.
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