2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64556We etablish a necessary and sufficient condition under which there exists a tangential and well graded star product, differential or not, on the dual g^* of a nilpotent Lie algebra g. We also give enlightening examples with explicit computations.15 pages, Latex 2eQuantum AlgebraCommutative AlgebraDifferential Geometry13D03, 14B15, 17B30, 81S05text