Abstract
A series of 1,8-bis(phosphino)naphthalenes 2 was prepared by treating 1,8-dilithionaphthalene with the appropriate chloro- or bromophosphines RR′PX; R, R′ = Me (for 2a), iPr (for 2c), Cy (for 2d), Ph (for 2f); R = tBu, R′ = Ph (for 2e) (X = Cl) and R, R′ = Et; × = Br (for 2b). The resulting bisphosphines were characterized by NMR spectroscopy, mass spectrometry, and elemental analysis. X-ray crystal structure analy-ses were performed for 1,8-bis(diisopropylphosphino)-naphthalene (2c), 1,8-bis(dicyclohexylphosphino)-naphthalene (2d), and rac-1,8-bis(tert-butylphenylphosphino)naphthalene (2e). In each case, the proximity of the PR2 groups leads to distortion the main feature of which is the out-of-plane displacement of the P atoms. However, the distortions arising from the bulky PCy2 groups in 2d were remarkably small. © 1997 John Wiley & Sons, Inc. Heteroatom Chem 8:539–550, 1997
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