The following reaction is the first step in the industrial synthesis of acetone and phenol (C6H5OH). AIBN (2,29-azobisisobutyronitrile) initiates radical reactions by breaking down upon heating to form two isobutyronitrile radicals and nitrogen gas. Using an isobutyronitrile radical to initiate the reaction, write a mechanism for the following process.

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OH O2, AIBN CN AIBN