S1 Supporting Information Hetero Diels-Alder reaction of vinyl-allenes and aldehydes. An experimental and computational study David Regás, Juan M. Ruiz, María M. Afonso, J. Antonio Palenzuela* Instituto Universitario de Bio-Orgánica “Antonio González”, Departamento de Química Orgánica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain jpalenz@ull.es General experimental procedures ............................................................. S2 Copies of 1 H and 13 C NMR spectra* of new compounds…....................... S3 Discussion of the Mulliken charges of the Transition States computed ...S68 Cartesian Coordinates, energies, ZPE corrections and imaginary frequencies for transition states for all computed compounds ….……….S69 * The figures on the NMR spectra depicts an arbitrary enantiomer. All compounds were obtained as racemic mixtures.