| http://www.w3.org/ns/prov#value | - Tetrahedron 1988, vol. 44, no. 19, 6197 will give the compounds of formula (I) in which R is a methyl radical and B is a cyclopentane: ##STR7## Reaction of the lithium derivative of a cyclopentadiene, in tetrahydrofuran, with the derivatives of formula (IV), according to the following reference:
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