1,8-BIS(PHOSPHANYL)NAPHTHALENES - 1,8-BIS[(DIETHYLAMINO)PHOSPHANYL]NAPHTHALENE, 1,8-BIS(DICHLOROPHOSPHANYL)NAPHTHALENE, AND 2,3-DIHYDRO-1,3-DIOXO-2-OXA-1,3-DIPHOSPHAPHENALENE

1,8-Dilithionaphthalene 1 reacted with bis(diethylamino)chlorophosphan e to form 1,8-bis[(diethylamino)phosphanyl]naphthalene 2, whose struct ure was confirmed by X-ray crystal structure analysis; there are two i ndependent molecules, in which the P(NEt2)(2) groups adopt an eclipsed conformation. Reaction of 2 with gaseous HCl gave in low yield 1,8-bi s(dichlorophosphanyl)naphthalene 3, which was characterized by H-1- an d P-31-NMR spectroscopy, mass spectrometry and elemental analysis. Att empted recrystallization of 3 led to oxidative hydrolysis which furnis hed 4, an anhydride of a bis(chlorophosphonic acid), whose structure w as elucidated by X-ray crystal structure analysis. The geometry of 4 r eveals a relief of strain from the bis(aminophosphane) 2; the naphthal ene groups are less distorted and the P atoms are displaced less far f rom the naphthalene best plane.