Abstract
The preparation of several cyclopentadienyliron dicarbonyl η1-2-alkynyl and η1-allenyl complexes is reported. The 3 + 2 cycloaddition reactions of these complexes with sulfur dioxide yielded regioisomeric transition-metal-substituted 1,2-oxathiolen-1-yl oxides (sulfenate esters). One of the η1-allenyl complex SO2 cycloadducts has been characterized by X-ray crystallography. The transition metal can subsequently be cleaved from the sulfenate ester containing complexes under oxidative and nonoxidative reaction conditions to produce a variety of new sulfur-containing heterocycles.
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