Diels-Alder reaction of cyclopentadiene with non-polar acrylic acid - on the surface of solid particles with subsequent elution of adduct with organic solvent

摘要

Reaction of cyclopentadiene with alpha,beta-unsatd. organic cpds. by the Diels-Alder reaction and then recovery of the resulting adduct, is carried out between non-polar, opt. substd. acrylic acid derivs. and the cyclopentadiene in heterogeneous phase on specific surfaces of solid particles, and the endo- and/or exo-adducts are eluted from the solid surfaces with known organic solvents. Prodn. of 2-norbornene-5-carboxylic acid derivs. suitable for use in further chemical reactions such as hydrogenation reactions, rearrangements and substitution reactions. The prods. are intermediates for biologically active cpds. such as herbicides and fungicides. Simple and easy-to-perform process suitable for continuous operation. The process gives reproducible results, and process conditions can be varied to reproducibly favour production of either the exo- or the endo- isomer.