The synthesis and several reactions of the stable silylene 1 (1,3-di-tert-butyl-2,3-dihydro-1H-1,3,2diazasilol-2-ylidene) are described. X-ray crystal structures are given for two intermediates in the synthesis of 1, the diimine 7 and its dilithium salt 8, and for a byproduct, the spiro compound 10. 1 reacts with ethanol and water by inserting into the O-H bond, and with iodomethane by insertion into the C-I bond. The silanol from reaction of 1 with water condenses to a disiloxane, 13. From 1 and sulfur and selenium, cyclic compounds containing Si 2 E 2 rings are obtained (E ) S or Se). Crystal structures are presented for disiloxane 13 and for the sulfur and selenium cycloadducts, 15 and 17.

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Tetra(2,6-dimethylphenyl)disilene reacts with (2,6-dimethylphenyl)isocyanide in benzene solution at room temperature to form disilacyclopropanimine ( l ) , a bright red crystalline compound with h,,, = 510 nm, whose structure was established by X-ray crystallography.The reactions of disilenesl lead to many new classes of silicon compounds, including several three-and four-membered rings which present novel problems in chemical bonding.* We report here the reaction of a disilene with an isonitrile to form the first disilacyclopropanimine, (1).The addition of the colourless 2,6-dimethylphenylisocyanide (57 mg) to a yellow solution of tetra(2,6-dimethyl-pheny1)disilene (200 mg) in 2 ml of benzene at room temperature, resulted in an immediate colour change to deep red. Upon standing, crystals of (1) suitable for X-ray crystallographic analysis were obtained from this reaction mixture (Scheme 1). t The compound decolourizes slowly, both in solution and in the solid state, on exposure to air.

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