Question

12. Heading toward cubane synthesis. Cyclobutadiene is difficult to isolate because it readily reacts with itself to form a dimer (two molecules coming together to form one bigger molecule) according to the reaction below. (Stereochemistry is not indicated.) cyclobutadiene dimer named as triyclo[4.2.0.02.- Jocta-3,7-diene (a) Describe in detail how the name triyclo[4.2.0.025 Jocta-3,7-diene is derived from the structure. Tell about each part of the name: tri, cyclo, 4, 2, 0, 0,2-5, octa, 3, 7, di, ene (b) This above reaction could follow either a [2+2], [4+2), or [4 + 4) cycloaddition mechanism. The 12+2) mechanism is started for you below. Sketch these three different mechanisms (arrows) below and verify that the same product is obtained with each. Use curved arrows to show electron flow. [4 + 2]

Answer 1

Page No. 2+2 4+2 4+4 6 A=B= Hence, It ① ② & 3 is verified has same that ron product

have 2 +2 BV Favorski NaOH decarboxylation -2002 Cubant