METHOD OF PREPARING 1-ETHYL-2-AZA-3-METHYL-4-ALKYLIDENEALUMACYCLOHEPT-2-ENES Russian patent published in 2003 - IPC

FIELD: organic synthesis. SUBSTANCE: title compounds having general formula , in which R represents n-hexyl or n-octyl, are prepared by reaction of 1- alkylallenes of general formula R-CH=C=CH₂, in which R is the same as above, with triethylaluminum in presence of zirconacene dichloride (Cp₂ZrCl₂ wherein Cp is η⁵-C₅H₅) at molar ratio R-CH=C=CH₂/AlEt₃/Cp₂ZrCl₂ equal to 10:(10-14):(0.2-0.6) in dichloromethane medium. Reaction is carried out for 5 h at room temperature, after which acetonitrile in triple excess relative to triethylaluminum is added to reaction mixture and stirring is continued for further 4-8 h at about 40 C. Thus obtained compounds can find use in organometallic and fine organic synthesis. EFFECT: optimized synthesis parameters. 1 tbl, 8 ex