Deuterium oxide

All NMR experiments were carried out on a Bruker Avance III 600 MHz, Bruker Biospin GmbH, (Rheinstetten, Germany) with TXI probe and a temperature control unit was used for all 1D and 2D experiments. The 5-mm single use NMR tubes were purchased from GPE Scientific, Leighton Buzzard, UK) (product code 512-7). The spectra were recorded using Deuterium oxide (99.90% D) purchased from Fluorochem (Glossop, UK). l-cystine (≥ 99.7% by TLC) and sodium sulfite (≥98%) were purchased from Sigma-Aldrich, Haverhill, UK and used without further purification. Distilled H₂O was generating using an ELGA water still and degassed using N₂ gas (BOC, 99.99%)

1-Octadecene (ODE, technical grade, 90%),
triethyloxonium tetrafluoroborate ([Et₃O][BF₄], ≥97.0%), acetonitrile (ACN, 99.8%, anhydrous), chloroform
(≥99%, anhydrous), and methanol (≥99.9%, anhydrous)
were purchased from Sigma-Aldrich. Oleic acid (extra pure), trifluoroacetic
acid (HTFA, ≥99.0%, for HPLC), trifluoroacetic anhydride (TFAA,
≥99.0%), lithium carbonate (Li₂CO₃, 99.999%,
trace metal basis), yttrium oxide (Y₂O₃, 99.9999%,
REO), and ytterbium oxide (Yb₂O₃, 99.998%, REO)
were purchased from Fisher Scientific. Toluene (≥99.8%, anhydrous)
and ethanol (≥99.8%, anhydrous) were purchased from VWR Chemicals.
Hexane (>96.0%, anhydrous) was purchased from TCI. Deuterium oxide
(D₂O, >99.90% D) was purchased from Fluorochem Ltd.
All chemicals were used as received unless specified differently.
All manipulations were performed under a N₂ atmosphere
using standard Schlenk line techniques or a nitrogen-filled glove
box (<0.1 ppm H₂O; <0.1 ppm O₂) unless
otherwise mentioned.
Milli-Q water was obtained from a Milli-Q
Advantage A10 system
(Merck Millipore, 18.2 MΩ·cm, 2 ppb TOC).