Allenylpalladium(II) species: possible intermediates in the tetrakis(triphenylphosphine)palladium(0)-catalysed formation of allenes from prop-2-ynylic substrates

Abstract

The formation of a 3-methylbuta-1,2-diphenylpalladium(II) complex (2) from the prop-2-ynylic chloride (1a) or the prop-2-ynylic acetate (1b) and tetrakis(triphenylphosphine)palladium(0), as well as its conversion into the allenes(4), is described.