The invention relates to a polymerizable composition which comprises a thermolabile polymerizable compound of Formula I: A-[X-(T-X-Sp-X)p-T-X-Q-(Z)n]m   Formula I, wherein T represents a thermolabile Diels-Alder or hetero-Diels-Alder group of the Formula The invention also relates to the use of the polymerizable composition according to the present invention and the compounds of Formula I according to the present invention as polymerization resin or for the preparation of polymerization resins and polymerizates such as adhesives, composites, stereolithographic materials, shaped parts, duromers and mounting and fixing elements, and as dental material and for the preparation of dental materials such as adhesives, cements and filling composites.