Question

11. Show the full arrow pushing mechanism and provide an unambiguous structure for the transition state intermediate and the product that results from the first step of hydroboration. I- HA

Answer 1

Solution: The given reuton is ВHs -ВИ2 H H202 3 Naok Mechanism: -PT ВИз ВНz Snaddition

Внz H So one BH2 moleule react with three altene group H202 +00 0-OMt H20 R&R OH H 1 R O O-R O-OH H20 В - O-R R BEOH)2 Он он 0 + В + 2 H20 3 BLOH) Th

SJo addition. It follow The addition of BHa to alkene is Markonikaff's addition Tule BH3-elet nop hile and alkene is nucleophile Format ion of simple tour center transiHon state Addition of BH3 in alkene s (n addition followed b hydrolfsis in H2o2 NaoH to give odcohol IMP- One BH3 moleule eact with three alkine molecule to give three aliohol molecule