The following conversion, carried out in the presence of Grubbs catalyst and ethylene gas, involves a cascade of metathesis reactions. Draw a reaction sequence that illustrates how the reactant is converted to the product Z, and indicate where each labeled atom in the reactant ends up in Z.
The demonstrated molecules are marked as 4, 8, and 13 in the beginning material. It is an intramolecular response. In the initial step of the response succession, the main carbon iota consolidates with the fifth carbon particle to frame five membered-ring and the crossed over bonds present between the fifth and eighth carbon iotas are broken to shape a subbed six-membered ring.
In the following stage, substituent present at eight carbon iota consolidates with a fourteenth carbon molecule and results in the development of the seven-membered ring alongside the arrivals of ethylene gas.
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