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Catalytic hydration of terminal alkenes to primary alcohols

Journal Article · · Science (Washington, D.C.); (United States)
Direct catalytic hydration of terminal alkenes to primary alcohols would be an inexpensive route to industrially useful alcohols and a convenient synthetic route for the synthesis of terminal alcohols in general. The reaction between trans-PtHCl(PMe/sub 3/)/sub 2/ (where Me = CH/sub 3/) and sodium hydroxide in a one-to-one mixture of water and 1-hexene yields a species that, at 60/sup 0/C and in the presence of the phase-transfer catalyst benzyltriethylammonium chloride, catalyzes selective hydration of 1-hexene to n-hexanol at a rate of 6.9 +/- 0.2 turnovers per hour. Hydration of 1-dodecene to n-dodecanol occurs at a rate of 8.3 +/- 0.4 turnovers per hour at 100/sup 0/C. Deuterium labeling experiments with trans-PtDCl(PMe/sub 3/)/sub 2/ show that hydration involves reductive elimination of a C-H bond. At low hydroxide concentrations (<8 equivalents), hydration of the water-soluble olefin 3-butene-1-ol to 1,4-butanediol exhibited a first-order dependence on hydroxide concentration for loss of catalytic activity. This suggest that hydroxide attacks the coordinated alkene slowly. At high hydroxide concentrations, the rate of catalysis was hydroxide-independent and first-order in alkene. Substitution of coordinated water (k/sub 1/ = 9.3 +/- 0.5 x 10/sup -3/ liters per mol per second) appears to be limiting under these conditions.
Research Organization:
Univ. of California at San Diego, La Jolla
OSTI ID:
6928205
Journal Information:
Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 233; ISSN SCIEA
Country of Publication:
United States
Language:
English