There is exciting potential for SANS to resolve an important problem in homogeneous catalyst chemistry. The Pd-chiral catalyst 1+ below has significant pan-industrial potential applications, being almost unique for having high selectivity in chiral syntheses. Certain solution conditions trigger a remarkable (and as yet unexplained) shift in selectivity: the catalyst is still effective, but it now loses the all-important chiral selectivity. Based on extensive 31P-NMR and trial SANS, this thought to be owing to aggregation/oligmerization to generate (1+)n . The requested beam time will allow this intriguing system to be interrogated in detail, to help explain the unusual properties for design of second generation catalysts which retain chiral activity. The PI is a new user, working in collaboration with Eastoe¿s experienced neutron research team