1: 95 percent / HBF4 / tetrahydrofuran; H2O / 2 h / Ambient temperature 2: 51 percent / CsF / tetrahydrofuran / 48 h 3: 87 percent / trimethylsilyl chloride, tetrabutylammonium bromide / acetonitrile / 15 h / 40 °C 4: 56 percent / phosphopantetheine adenylyltransferase, dephosphocoenzyme A kinase, MgCl2, pyrophosphatase, pyruvate kinase, phospho(enol) pyruvate / H2O; various solvent(s) / 168 h / Ambient temperature 5: Crotalus atrox venom nucleotide pyrophosphatase EC 3.6.1.9 / H2O / 4 h 6: potato acid phosphatase EC 3.1.3.2 / H2O / 21 h View Scheme