Cyclic ketene acetal nitrogen

Related work had shown that the nitrogen analogs of the cyclic ketene acetals were readily synthesized and would polymerize with essentially 100% ring opening. For this reason their copolymerization with a variety of monomers was undertaken (6). 

Since an amide group is more stable than an ester group, the nitrogen analog XIII of the cyclic ketene acetal was synthesized and polymerized to give the polyamide XIV. 

Since the nitrogen and sulfur analogs of the cyclic ketene acetal I... 

Picryl azide and sulfonyl azides react with ketene AtA -acetals to give switter ionic linear adducts. The intramolecular cycloaddition reaction of azides to ketene S,S-acetals at 130 °C proceeds with loss of nitrogen to produce cyclic imines . ... 

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