Abstract
Toluenemolybdenum tricarbonyl reacts quantitatively with pentamethylcyclopentadiene in THF at room temperature yielding HMo(CO)3C5Me5. The heat given off in this reaction has been measured by solution calorimetry and indicates there is little difference in the MoC5H5 and MoC5Me5 bond strengths. Thermochemical measurements of the reaction of HMo(CO)3C5R5 (R = H, CH3) with pyridine yielding (py)3Mo(CO)3 confirm this result. In THF solution, HMo(CO)3C5Me5 is a weaker acid than HMo(CO)3C5H5, ΔpKa ≥ 3. The heat of hydrogenation of (Mo(CO)3C5R5)2 to yield two mol of HMo(CO)3C5R5 is more favorable by about 2 kcal/mol for R = CH3 compared to R = H, probably due to steric repulsion in (Mo(CO)3C5Me5)2.
| Original language | English |
|---|---|
| Pages (from-to) | 357-362 |
| Number of pages | 6 |
| Journal | Journal of Organometallic Chemistry |
| Volume | 282 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 12 1985 |
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ASJC Scopus subject areas
- Biochemistry
- Chemical Engineering (miscellaneous)
- Inorganic Chemistry
- Organic Chemistry
- Physical and Theoretical Chemistry
- Materials Science (miscellaneous)
- Materials Chemistry
Cite this
Synthesis and thermochemistry of HMo(CO)3C5Me5; Comparison of cyclopentadienyl and pentamethylcyclopentadienyl ligands. / Nolan, Steven P.; Hoff, Carl; Landrum, John T.
In: Journal of Organometallic Chemistry, Vol. 282, No. 3, 12.03.1985, p. 357-362.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and thermochemistry of HMo(CO)3C5Me5; Comparison of cyclopentadienyl and pentamethylcyclopentadienyl ligands
AU - Nolan, Steven P.
AU - Hoff, Carl
AU - Landrum, John T.
PY - 1985/3/12
Y1 - 1985/3/12
N2 - Toluenemolybdenum tricarbonyl reacts quantitatively with pentamethylcyclopentadiene in THF at room temperature yielding HMo(CO)3C5Me5. The heat given off in this reaction has been measured by solution calorimetry and indicates there is little difference in the MoC5H5 and MoC5Me5 bond strengths. Thermochemical measurements of the reaction of HMo(CO)3C5R5 (R = H, CH3) with pyridine yielding (py)3Mo(CO)3 confirm this result. In THF solution, HMo(CO)3C5Me5 is a weaker acid than HMo(CO)3C5H5, ΔpKa ≥ 3. The heat of hydrogenation of (Mo(CO)3C5R5)2 to yield two mol of HMo(CO)3C5R5 is more favorable by about 2 kcal/mol for R = CH3 compared to R = H, probably due to steric repulsion in (Mo(CO)3C5Me5)2.
AB - Toluenemolybdenum tricarbonyl reacts quantitatively with pentamethylcyclopentadiene in THF at room temperature yielding HMo(CO)3C5Me5. The heat given off in this reaction has been measured by solution calorimetry and indicates there is little difference in the MoC5H5 and MoC5Me5 bond strengths. Thermochemical measurements of the reaction of HMo(CO)3C5R5 (R = H, CH3) with pyridine yielding (py)3Mo(CO)3 confirm this result. In THF solution, HMo(CO)3C5Me5 is a weaker acid than HMo(CO)3C5H5, ΔpKa ≥ 3. The heat of hydrogenation of (Mo(CO)3C5R5)2 to yield two mol of HMo(CO)3C5R5 is more favorable by about 2 kcal/mol for R = CH3 compared to R = H, probably due to steric repulsion in (Mo(CO)3C5Me5)2.
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U2 - 10.1016/0022-328X(85)87194-1
DO - 10.1016/0022-328X(85)87194-1
M3 - Article
AN - SCOPUS:0000149561
VL - 282
SP - 357
EP - 362
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
SN - 0022-328X
IS - 3
ER -