SCHEDULED MAINTENANCE:
Bicyclobutylidene has been synthesised in a three-step synthesis from cyclobutanone; reaction of bicyclobutylidene with methylene gave dispiro[3,0,3,1]nonane, and reaction with m-chloroperoxybenzoic acid gave 9-oxadispiro[3,0,3,1]nonane.
J. W. Everett and P. J. Garratt, J. Chem. Soc., Chem. Commun., 1972, 642a DOI: 10.1039/C3972000642A
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