HELVETICA CHIMICA ACTA - Vol. 81 (1998) ... acid 2 (Method I, Scheme 2) or acylation of the 4-(benzy1oxy)henzyl alcohol resin (Wung resin) with the ketene intermediates from the Worff rearrangement of amino-acid-derived diazo ketone 1 (Method II, Scheme 2). The former ...