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The structure of the compounds formed upon reacting Fe(Pri2P(CH2)nPPri2)Cl2 (n = 1-3) and active-Mg with acyclic and cyclic 1,3-, 1,4- and 1,5-dienes depends upon the nature of the diene and upon the length of the methylene-chain bridging the two P-atoms of the bidentate ligand. For example, isoprene reacts to give either (η4-isoprene)2FePPri2C2H4PPri2 or (η4-isoprene)Fe(Pri2PC3H6PPri2) while the products of the reaction with 1,5-hexadiene are (η5-1-methylpentadienyl)Fe(Pri2PC2H4PPri2)H ordoi:10.1515/znb-1995-0407 fatcat:gawerh7bgzdxvfpu42crc523n4