Potassium cyclooctadienide → (Tetramethylcyclopentadienyl)dimethylsilyl(cyclooctadiene)

HRID 1636207Notes

Reaction equation

[C-]1CCCCC=CC=1.[K+].CC1C(C)=C(C)C([Si](Cl)(C)C)(C)C=1.[CH3:23][C:24]1[C:25]([CH3:42])=[C:26]([CH3:41])[C:27]([Si:30]([CH:33]2[CH:40]=[CH:39][CH2:38][CH2:37][CH2:36][CH:35]=[CH:34]2)([CH3:32])[CH3:31])([CH3:29])[CH:28]=1.CC1C(C)=C(C)C([Si](C2CCCC=CC=C2)(C)C)(C)C=1>C1COCC1>[CH3:23][C:24]1[C:25]([CH3:42])=[C:26]([CH3:41])[C:27]([Si:30]([C:33]2[CH2:40][CH2:39][CH2:38][CH2:37][CH:36]=[CH:35][CH:34]=2)([CH3:32])[CH3:31])([CH3:29])[CH:28]=1

Participants

Conditions

Temperature: 25 °C

Procedure

Potassium cyclooctadienide (3.42 g, 23.4 mmols) dissolved in about 50 mL of THF was added to a solution of (tetramethylcyclopentadienyl)chloro-dimethylsilane (5.02 g, 23.4 mmols) in about 80 mL of THF at about 25° C. A precipitate formed and the reaction mixture was stirred for about 16 hours at about 25° C., after which time the reaction mixture was filtered and the solvents removed under reduced pressure. The residue was extracted with hexane and filtered. The solvents were again removed under reduced pressure leaving the desired isomeric product comprising (tetramethylcyclopentadienyl)(cylcoocta-2,7-dien-1-yl)dimethylsilane and (tetramethylcyclopentadienyl)(cylcoocta-2,4-dien-1-yl)dimethylsilane.

Workup

customA precipitate formed
filtrationafter which time the reaction mixture was filtered
customthe solvents removed under reduced pressure
extractionThe residue was extracted with hexane
filtrationfiltered
customThe solvents were again removed under reduced pressure
customleaving the desired isomeric product

Sources & evidence

ORD record: ord-e85a07e907f34309b90e82b6bf1032dd
Source dataset: uspto-grants-2000_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06034021

Reaction notes

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