Dichlorodimethylsilane → 4-Chlorodimethylsilylbenzonitrile

HRID 247632

Reaction equation

[C:1]([C:3]1[CH:11]=[CH:10][C:6](C(Cl)=O)=[CH:5][CH:4]=1)#[N:2].Cl[Si:13]([CH3:19])([CH3:18])[Si](C)(C)Cl.[C]=O.C[Si](C)(Cl)[Cl:24]>C1C=CC(C#N)=CC=1.C1C=CC(C#N)=CC=1.Cl[Pd]Cl.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[Cl:24][C:6]1[CH:10]=[CH:11][C:3]([C:1]#[N:2])=[C:4]([SiH:13]([CH3:19])[CH3:18])[CH:5]=1

Participants

Conditions

Temperature: 135 °C

Procedure

A reaction mixture containing 10 gm (6×10-2 mole) of p-cyanobenzoyl chloride and 15 gm (1.25 mole equivalent) of 1,2-dichlorotetramethyldisilane was heated to 135° C. during which time the solution became homogeneous. A cocatalyst mixture containing 200 mg. bis(benzonitrile)palladiumdichloride (1 mole %) and 274 mg triphenylphosphine (2 mole %) was then introduced. Carbon monoxide gas evolution began immediately and the reaction was heated at 140° C. for 12 hours while dimethyldichlorosilane was continuously removed. Vacuum distillation gave 7 gm (60% isolated yield) of 4-chlorodimethylsilylbenzonitrile, bp. 93°/0.1 torr, m.p. 40°-43° C. The resulting chlorodimethylsilylbenzonitrile, in the form of a low melting high moisture sensitive solid was hydrolyzed to the corresponding 1,3-bis(4'-benzonitrile)tetramethyldisiloxane in the form of a colorless liquid. The identity of the disiloxane was further confirmed by its NMR and IR spectra.

Workup

additionA cocatalyst mixture containing 200 mg
customwas continuously removed
distillationVacuum distillation

Sources & evidence

ORD record: ord-cb6a7eabdcee432a8f29787889f303d6
Source dataset: uspto-grants-1987_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04709054

Linked notes

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