The Stereochemistry of Alkylation of Allylic Alcohol Derivatives with Lithium Dimethylcuprate and Lithium Heteromethylcuprates ; On the Solvolysis of 2-cyclohexenyl 3,5-dinitrobenzoate and P-nitrobenzoate in Aqueous Acetone. Introduction of Acyl-oxygen Cleavage by Basic Buffer Systems