Cyclopentadienyl thallium
Encyclopedia
Cyclopentadienylthallium, also known as thallium cyclopentadienide, is an organothallium compound with formula C5H5Tl. This light yellow solid is insoluble in most organic solvents, but sublimes readily, and is useful as a precursor to transition metal
and main group Cp
compounds, as well as organic cyclopentadiene
derivatives.
, sodium hydroxide, and cyclopentadiene
:
, CpMgBr and Cp2Mg, cyclopentadienylthallium is less air sensitive.
Transition metal
The term transition metal has two possible meanings:*The IUPAC definition states that a transition metal is "an element whose atom has an incomplete d sub-shell, or which can give rise to cations with an incomplete d sub-shell." Group 12 elements are not transition metals in this definition.*Some...
and main group Cp
Cyclopentadiene
Cyclopentadiene is an organic compound with the formula C5H6. This colorless liquid has a strong and unpleasant odor. At room temperature, this cyclic diene dimerizes over the course of hours to give dicyclopentadiene via a Diels–Alder reaction...
compounds, as well as organic cyclopentadiene
Cyclopentadiene
Cyclopentadiene is an organic compound with the formula C5H6. This colorless liquid has a strong and unpleasant odor. At room temperature, this cyclic diene dimerizes over the course of hours to give dicyclopentadiene via a Diels–Alder reaction...
derivatives.
Preparation
Cyclopentadienylthallium is prepared by the reaction of thallium(I) sulfateThallium(I) sulfate
Thallium sulfate , archaically known as thallous sulfate, is the sulfate salt of thallium. It is colorless, odorless, and tasteless, but highly toxic.-Uses:...
, sodium hydroxide, and cyclopentadiene
Cyclopentadiene
Cyclopentadiene is an organic compound with the formula C5H6. This colorless liquid has a strong and unpleasant odor. At room temperature, this cyclic diene dimerizes over the course of hours to give dicyclopentadiene via a Diels–Alder reaction...
:
- Tl2SO4 + 2 NaOH → 2 TlOH + Na2SO4
- TlOH + C5H6 → TlC5H5 + H2O
Applications
Compared to most of other cyclopentadienyl transfer reagent such as cyclopentadienyl sodiumSodium cyclopentadienide
Sodium cyclopentadienide is an organosodium compound with the formula C5H5Na. The compound is often abbreviated as NaCp or CpNa, where Cp− is the cyclopentadienide anion. Cp is also used as an abbreviation for the cyclopentadienyl ligand in coordination chemistry.-Preparation:Sodium...
, CpMgBr and Cp2Mg, cyclopentadienylthallium is less air sensitive.