Abstract
3,3-Dimethyl-2-phenyl-cyclopropenecarboxylic acid 4 is prepared, starting with chlorophenyldiazirine 1. With acids 4 yields the open chain carboxylic acids 5, 6 and 7. Thionychloride leads to the cyclobutenone 10, DCC to the acid anhydrides 11 and 13.
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