Synthesis of electron-withdrawing butane- and arene-sulfonylamino phosphines and use in rhodium-catalyzed hydroformylationDedicated to the memory of Mohammad Salman Hamdani. Sal worked in our labs at Queens College as an undergraduate student from 1998–2001, and died as part of the rescue effort at the World Trade Center in New York City, September 11, 2001.Electronic supplementary information (ESI) available: details of the syntheses, purification, and NMR and analytical data. See http://www.rsc.org/suppdata/dt/b2/b208089c/