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fused phenylcycloalkyl derivatives fused phenylcycloalkyl derivatives (rings with 3, 4, 7 or more members) Q 1040 01 -110 Copper-Catalyzed Intermolecular [4 + 4] and [4 + 5] Coupling of Zirconacyclopentadienes with Bis(halomethyl)arenes: A New Pathway to Eight-and Nine-Membered Ring Derivatives. --(TAKAHASHI, T.; SUN, W.-H.; LIU, Y.; NAKAJIMA, K.; KOTORA, M.; Organometallics 17 (1998) 18, 3841-3843; Catal. Res. Cent., Grad. Sch. Pharm.

Zirconocene-Catalyzed Cyclobutene Formation by Reaction of Alkynyl Halides with EtMgBr.-Zirconium-catalyzed reaction of alkynyl chlorides with EtMgBr provides cyclobutene derivatives in which two carbon-carbon bonds are formed for the first time on the ethyl moiety of EtMgBr via an ethylene group in a catalytic cycle. The same products are obtained under both catalytic and stoichiometric conditions; however, under the latter conditions the reaction proceeds much faster. 1-Bromo-and 1-iodoalkynes do not give cyclobutenes under these conditions; only metal-halogen exchange products are formed. -(KASAI, K.; LIU, Y.; HARA, R.; TAKAHASHI, T.; Chem.