β Scribed by Eero Kiljunen; Liisa T. Kanerva
No coin nor oath required. For personal study only.
Apple, apricot, cherry and plum meal were prepared from the seeds or kernels of mature garden fruits. The preparations as well as almond meal were used as the source of (R)-oxynitrilase for the synthesis of aliphatic and aromatic cyanohydrins in diisopropyl ether in the presence of 0.1 M tartrate buffer [2% (v/v), pH 5.4]. Apple meal as the most favourable of the enzyme preparations accepts also sterically hindered aldehydes (e.g., pivalaldehyde) as substrates, leading to (R)-cyanohydrins with high enantiopurity (usually ee>90%).
π SIMILAR VOLUMES
The enantioselective synthesis of optically active (R)~cyanohydrins generated from several aromatic, heteroaromalic and aliphatic aldehydes and methyl ketones was carried out using almond. peach or Ioquat meal as (R)-oxynitrilase sources in diisopropyl ether under micro-aqueous conditions. The micro
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Novel preparation of (R,R)Bromo-3-Quinuclidinylbenzilate (Br-QNB), a precursor for the synthesis of (R,R)['\*'I]Iodo-QNB