COMMUNICATIONS 35 mol% LiBr were allowed to react under 60 bar CO at 120 "C for 12h. The volatile components were removed under high vacuum, and the residue was taken up in a saturated aqueous solution of NaHCO, and then washed with chloroform and ethyl acetate. The aqueous phase was adjusted to pH 2 with phosphoric acid and extracted with ethyl acetate The organic phases were then combined and dried over magnesium sulphate, and the solvent was removed under vacuum. The product was recrystallized from a suitable solvent mixture. All isolated compounds were characterized by means of NMR and IR spectroscopy and mass spectrometry. The purity of the products, as measured by HPLC, was >98%
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