Ketenes Perkin reaction

Kinastowski, S., Kasprzyk, H. Ketene intermediates in the Perkin reaction catalyzed by tertiary amines. Bulletin de TAcademie Polonaise des Sciences, Serie des Sciences Chimiques 1978, 26, 907-915. 

Kita, Y., Shibata, N., Yoshida, N., Fujita, S. First highly asymmetric Pummerer-type reaction in chiral, non-racemic acyclic sulfoxides induced by 0-silylated ketene acetal. J. Chem. Soc., Perkin Trans. 1 1994, 3335-3341. 

Alonso, E., del Pozo, C., Gonzalez, J. Staudinger reactions of unsymmetrical cyclic ketenes a synthetically useful approach to spiro p-lactams and derivatives. Reaction mechanism and theoretical studies. J. Chem. Soc., Perkin Trans. 1 2002, 571-576. 

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