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Diphosphines with Natural Bite Angles Near 120 • Increase Selectivity for n-Aldehyde Formation in Rhodium-Catalyzed Hydroformylation.-The diphosphine compounds (I)-(III), in which the chelate backbone restricts the natural bite angle, are tested as ligands in rhodium catalysts such as (IV). A correlation is found between the size of the P-Rh-P bite angle and the regioselectivity for the formation of the straight-chain aldehyde (VII) in the rhodium-catalyzed hydroformylation of 1-hexene (V). -(CASEY, C. P.; WHITEKER, G. T.; MELVILLE, M. G.; PETROVICH, L. M.; GAVNEY, J.