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Hydricities of BzNADH, C5H5Mo(PMe3)(CO)2H, and C5Me5Mo(PMe3)(CO)2H in Acetonitrile
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Abstract
The thermodynamic hydride donor abilities of 1-benzyl-1,4-dihydronicotinamide (BzNADH,
59 +/- 2 kcal/mol), C(5)H(5)Mo(PMe(3))(CO)(2)H (55 +/- 3 kcal/mol), and C(5)Me(5)Mo(PMe(3))(CO)(2)H
(58 +/- 2 kcal/mol) have been measured in acetonitrile by calorimetric and/or equilibrium
methods. The hydride donor abilities of BzNADH and C(5)H(5)Mo(PMe(3))(CO)(2)H differ
by 13 and 24 kcal/mol, respectively, from those reported previously for these compounds
in acetonitrile. These results require significant revisions of the hydricities reported
for related NADH analogues and metal hydrides. These compounds are moderate hydride
donors as compared to previously determined compounds.