Abstract
AbstractThe phosphetidine 2,4‐Di‐tert‐butyl‐3‐chloro‐1λ6‐thia‐2,4‐diaza‐3‐phosphetidine‐1,1‐dioxide, O2S (tBuN)2PCl, reacts with tetrasulfur tetranitride, S4N4, in benzene under reflux to afford the novel 4,6‐spirocycle in moderate yield. The deep‐blue crystals of the spirocycle are airstable and high melting in nature. The spiro phosphorus atom subtends a four‐membered PVSVIN2 ring which is saturated, and a six‐membered PVS$^{\rm IV}_{2}$N3 ring which is unsaturated. The single‐crystal X‐ray structure of this first example of the spirocycle reveals a planar PSN2 ring and a puckered PS2N3 ring and the molecule is symmetric in nature. Copyright © 2006 John Wiley & Sons, Ltd.
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