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Abstract
Treatment of the di-anion (5) derived from N, 2-dimethyl-2-(E), -butenamide (4) with cycloalkanones, followed by acid-catalysed hydrolysis and cyclodehydration of the resulting adducts, in a ‘one-pot’ procedure, provides a convenient stereospecific synthesis of spiro-(E), -α-ethylidene-γ-butyrolactones, e.g., (6), (7), and (9).