Reaktion #1766291

ord-b8143bbe14f149cfab5e6a1ee02f7902

Reaktionsgleichung

Cl[Si](Cl)(c1ccccc1)c1ccccc1
diphenyldichlorosilane
[K+].[OH-]
KOH
→
c1ccc([Si]2(c3ccccc3)O[Si](c3ccccc3)(c3ccccc3)O[Si](c3ccccc3)(c3ccccc3)O[Si](c3ccccc3)(c3ccccc3)O2)cc1
octaphenylcyclotetrasiloxane
Ausbeute 94.1%

Edukte

Cl[Si](Cl)(c1ccccc1)c1ccccc1
diphenyldichlorosilane
[K+].[OH-]
KOH

Reagenzien

Keine

Lösungsmittel

CC(C)=O
acetone
O
water

Reaktionsbedingungen

Detaillierte Bedingungen
See reaction.notes.procedure_details.

Aufarbeitung

  1. 1
    workup.DISTILLATIONThe acetone and a little water were then distilled off
  2. 2
    Temperaturafter cooling the residue
  3. 3
    Filtrationthe crystalline octaphenylcyclotetrasiloxane was filtered off
  4. 4
    Waschenwashed with water
  5. 5
    SonstigeAfter drying

Vorschrift

A mixture of 510 g of diphenyldichlorosilane in 500 ml of acetone was added dropwise in the course of 3 hours to a hot solution, at 60° C, of 340 g of KOH in 1 l of water, while stirring vigorously. The acetone and a little water were then distilled off and, after cooling the residue, the crystalline octaphenylcyclotetrasiloxane was filtered off and washed with water. After drying, 376 g (94% yield) of octaphenylcyclotetrasiloxane of melting point 187° C (metastable crystal modification) were obtained. After recrystallization from toluene, the product had a melting point of 201° C.

Quelle

DOI: 10.6084/m9.figshare.5104873.v1Patent: US04079070uspto-grants-1978_03