[Cl-].[Al+3].[Cl-].[Cl-].C(OC)(=O)C=C.C=CC(Cl)=C.Cl.[Cl:17][C:18]1[CH2:23][CH2:22][CH:21]([C:24]([O:26][CH3:27])=[O:25])[CH2:20][CH:19]=1.ClC1CC(C(OC)=O)CCC=1>C(Cl)Cl>[Cl:17][CH:18]1[CH2:19][CH2:20][CH:21]([C:24]([O:26][CH3:27])=[O:25])[CH2:22][CH2:23]1
A mixture of 200 parts of anhydrous aluminum chloride in 2000 parts of methylene chloride was maintained under an atmosphere of nitroge while 129 parts of methyl acrylate was added over a period of about 0.5 hours. With the addition of the methyl acrylate, the temperature of the mixture rose exothermically to about 34° C. The mixture was cooled to about 22° C. and 132.8 parts of freshly prepared chloroprene was added slowly, with stirring over a period of about 1.5 hours. During the addition, the temperature rose slowly to reflux condition (about 40° C.). The reaction mixture was then maintained under a nitrogen atmosphere, with stirring, for about 16 hours at ambient conditions. The crude reaction product was then treated with 10% HCl, and washed with methylene chloride and distilled to yield an essentially pure mixture of 1-chloro-4-carbomethoxy cyclohexene (92%) and its isomer 1-chloro-5-carbomethoxy cyclohexene (8%).
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