Multiple reductants were screened (Fig. ) after treatment with Co(thd)2 Et3SiH and O2 in DCE. The use of R-terpinene in substoichiometric amounts in the presence of MeOH did not lead to catalyst turnover (29% yield, Entry 2). Hantzsch ester and (R)-terpinene gave 57% and 65% yield respectively, comparable to the 65% observed with usage of PhSH (Entries 3-5). Without a hydrogen atom source present, only trace desired product was observed, with multiple unidentified adducts observable on TLC (entry 6). Many other metal reductants were explored that provided inferior results, including ferrocene, CuI, Mn(acac)3, and Ti(Cl)3. Telescoping the hydration and hydrodealkenylation reactions resulted in 71% yield of the desired product from the initial alkene, lending a one-pot procedure (Fig. ).