Chemistry explanation;draw a mechanism step by step of the synthesis which is in the other attached file (draw the mechanism steps in organized way by your hand), how much time each step took. The step which was resulted compound (13) and the step which w

draw a mechanism step by step of the synthesis which is in the other attached file (draw the mechanism steps in organized way by your hand), how much time each step took. The step which was resulted compound (13) and the step which was resulted compound (14) those two steps are non-productive steps, what is the reasons that make those two steps are non-productive steps?

Coupling O-benzyl protected phloroglucinol (7) and (E)-cinnamyl alcohol (8) to synthesize (E)-1,3-diarylpropene (9). Then,  “Asymmetric dihydroxylation of the TBDMS protected diarylpropene (10) using AD-mix-α afforded the (1S,2S)-syn-diol (11) which was deprotected to give phenol (12), and the latter subsequently cyclized to afford (+)-penta-O-benzylgallocatechin (13). This was converted into (-)-penta-O-benzylepigallocatechin (15) by Dess-Martin oxidation into the 3-ketoflavan (14) and subsequent stereoselective reduction of the latter. The compound EGCG (16) was then accessible via a simple acylation using 3,4,5-tri-O-benzylbenzoyl chloride, followed by deprotection via reductive de-O benzylation. (+)-ent-Epigallocatechin-3-gallate was available via simply replacing AD-mix-α with AD-mix-β in the asymmetric dihydroxylation step,”