6π Electrocyclization

6 real reactions from the literature, on conjugated trienes. Each scheme shows starting materials, conditions and products, with the yield and reference where the source reports them.

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1. 6π electrocyclization: oxepin (a conjugated triene) with 6e dis gives benzene oxide (the cyclohexadiene). 91% yield.

   6π electrocyclizationAngew. Chem. Int. Ed. 1967, 6, 402

2. 6π electrocyclization: a conjugated triene with 60 C; 6e dis gives 5-tert-butyl-6-cyclohexylidenecyclohexa-1,3-diene (the cyclohexadiene). 91% yield.

   6π electrocyclizationJ. Org. Chem. 1992, 57, 796

3. 6π electrocyclization: a conjugated triene with 60 C, PhMe gives the cyclohexadiene. 98% yield.

   6π electrocyclizationAngew. Chem. Int. Ed. 2003, 42, 549

4. 6π electrocyclization: a conjugated triene with 150 C; 6e dis gives 5,5-dimethyl-5H-benzocycloheptene (the cyclohexadiene).

   6π electrocyclizationAngew. Chem. Int. Ed. 1978, 17, 208

5. 6π electrocyclization: a conjugated triene with 225 C; 6e dis gives 1-ethyl-1,2-dihydronaphthalene (the cyclohexadiene).

   6π electrocyclizationHelv. Chim. Acta 1970, 53, 173

6. 6π electrocyclization: 1,2-bis[(E)-prop-1-enyl]benzene (a conjugated triene) with 225 C; 6e dis gives the cyclohexadiene.

   6π electrocyclizationHelv. Chim. Acta 1970, 53, 173