41. This diene is also not expected to act as a diene in a Diels Alder reaction due to its structure. 42. His most notable work was done with Kurt Alder on the Diels Alder reaction , a method for diene synthesis. 43. Norbornene, like many of its derivatives, is made by a Diels-Alder reaction of cyclopentadiene and ethylene. 44. Thus the ability of these heterobenzenes to undergo the Diels Alder reaction with this electrophile increases down the periodic table. 45. The near synchronicity of the DA INV means it can be treated similarly to the standard Diels-Alder reaction . 46. This intermediate can then undergo a tandem Diels-Alder reaction to achieve a decent yield with 97 % ee. 47. Under these conditions singlet oxygen is generated which reacts in a Diels Alder reaction with the diene system in the terpinene. 48. For this reason, benzocyclobutadiene will readily dimerize or polymerize and it reacts as a dienophile in Diels-Alder reactions . 49. Therefore like alkenes, phosphaalkenes engage in Wittig reactions, Peterson reactions, Cope rearrangements, and Diels-Alder reactions . 50. The compounds resulting from this type of electrocyclization have been used as dienes in Diels Alder reactions to attach compounds to fullerenes.
