The reaction of titanium cyclopropylidene complexes, prepared by the reductive titanation of 7,7-dichlorobicyclo[4.1.0]heptanes, with alkynes produced air and moisture stable titanacyclobutenes with a spiro-bonded cyclopropane.
Fused phenylcycloalkyl derivatives Q 1040Formation of Titanacyclobutenes with a Spiro-Bonded Cyclopropane. -A versatile procedure for the synthesis of alkenylcyclopropanes via air-and moisture-stable titanacyclobutenes is described. The structure of intermediates of type (IV) with a spiro-bonded cyclopropane ring is documented. -(SHONO, T.; NAGASAWA, T.; TSUBOUCHI, A.; NOGUCHI, K.; TAKEDA*, T.; Chem.
Cyclopropane derivatives Q 0021Titanocene (II)-Promoted Carbonyl Cyclopropylidenation Utilizing 1,1-Dichlorocyclopropanes. -Condensation of substrates (I) and (IV) with carbonyl compounds under conditions A) offers a practical process for the preparation of highly constrained alkylidenecyclopropanes. -(SHONO, T.; NAGASAWA, T.; TSUBOUCHI, A.; TAKEDA*, T.; Tetrahedron Lett. 48 (2007) 20, 3521-3524; Dep. Appl. Chem., Grad. Sch. Eng., Tokyo Univ. Agric. Technol., Koganei, Tokyo 184, Japan; Eng.) -Mais 35-066
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