An acidic ionic liquid offers an exciting window to directly produce hemicellulose pentoses and to valorise cellulose and lignin.

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We have measured the Li abundance in a sample of 37 field dwarfs of low metallicity (−0.6 ≥ [Fe/H] ≥ −3.2). Stars with [Fe/H] < −1.4 (“EMD” stars) form a much more homogenous population w.r.t.7Li than do the stars with somewhat higher metallicities. We argue in detail that the warmer EMD stars (6000K< Teff< 6300K) show little Li depletion, and that their asymptotic Li abundance log N(Li) = 2.2 (±0.15) is the best available approximation to a primordial value.

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