Small-Ring Compounds. XV. Methylenecyclobutene and Related Substances<sup>1</sup>
作者:Douglas E. Applequist、John D. Roberts
DOI:10.1021/ja01597a040
日期:1956.8
Methylenecyclobutene has been synthesized from diethylmethylenemalonate by way of 3-methylenecyclobutanecarboxylic acid and 3-rnethylenecyclobutylamine. The synthesis featured the use of anthracene as a blocking group for the exocyclic double bond during malonic-ester closure of the cyclobutane ring. 4,4-Dimethyl-3-methylenecyclobutene has been obtained by degradation of α-pinene and 1-phenyl-3-methylenecyclobutene