title: Studies on Lewis acid-mediated intramolecular cyclization reactions of allene-ene systems.
abstract: The Lewis acid-mediated reactions of allene-ene compounds, derived from 3-methylcitronellal or dimethyl malonate, were carried out using various Lewis acids such as ethylaluminum dichloride, diethylaluminum chloride, titanium chloride, zinc chloride etherate, or boron trifluoride etherate, affording unexpectedly intramolecular [2+2]cycloaddition products under some particular reaction conditions without any formation of intramolecular ene reaction products.
authors.affiliation: Department of Synthetic Organic Chemistry, Tohoku Pharmaceutical University, Sendai, Miyagi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hiroi
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Tsukui
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D000466:Alkadienes / Q000737:chemistry*; D003500:Cyclization; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D008314:Malonates / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013729:Terpenes / Q000737:chemistry
chemical_list: D000447:Aldehydes; D000466:Alkadienes; D007202:Indicators and Reagents; D008314:Malonates; D013729:Terpenes; C005230:methyl malonate