4455-83-8

Basic information

• Product Name: Disilane, 1-chloro-1,1,2,2-tetramethyl-
• Synonyms: 1-chloro-2H-tetramethyldisilane
• CAS NO: 4455-83-8
• Molecular Formula: C4H13ClSi2
• Molecular Weight: 152.771
• Mol File: 4455-83-8.mol
• Article Data: 6

Chemical Properties

• CAS DataBase Reference: Disilane, 1-chloro-1,1,2,2-tetramethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Disilane, 1-chloro-1,1,2,2-tetramethyl-(4455-83-8)
• EPA Substance Registry System: Disilane, 1-chloro-1,1,2,2-tetramethyl-(4455-83-8)

Safety Data

• Hazardous Substances Data: 4455-83-8(Hazardous Substances Data)

Upstream product

• 4342-61-4 1,2-dichlorotetramethylsilane 
• 75-78-5 dimethylsilicon dichloride 
• 814-98-2 1,1,2,2-tetramethyldisilane 
• 992-94-9 methylsilane 
• 1111-74-6 dimethylsilane 

Relevant articles and documents

1.4-addition of 1.1.2.2-tetrachlorodimethyldisilane to 1.4-diaza-1.3-dienes, synthesis and molecular structure of 1.6-disila-2.5-diaza-1.1.6.6-tetrachloro-1.6-dimethyl-2.5-di-p-tolyl-3.4-diphenyl-hexa-3-ene

Reaction of 1.1.2.2-tetrachlorodimethyldisilane (4) with 1.4-diazadienes like benzildianil (1), benzildi-p-tolil (2) and benzildi-p-anisil (3) leads to a 1.4-addition product of the disilane under cleavage of the Si-Si bond (1a, 2a, 3a). The structure of 2a was determined by X-ray crystallography (crystal data: monoclinic, P21/n, a = 14.661(4), b = 12.283(2), c = 17.564(5) A, β = 103.13°, Z = 4, R = 0.0585 for 5992 independent reflections). Surprisingly, 2a was found to be in the cis-configuration with almost C2 symmetry and a torsion angle of only 13°. Owing to statistical disorder, some bond lengths are not in the expected range.

Making Use of the Direct Process Residue: Synthesis of Bifunctional Monosilanes

The industrial production of monosilanes MenSiCl4?n (n=1–3) through the Müller–Rochow Direct Process generates disilanes MenSi2Cl6?n (n=2–6) as unwanted byproducts (“Direct Process Residue”, DPR) by the thousands of tons annually, large quantities of which are usually disposed of by incineration. Herein we report a surprisingly facile and highly effective protocol for conversion of the DPR: hydrogenation with complex metal hydrides followed by Si?Si bond cleavage with HCl/ether solutions gives (mostly bifunctional) monosilanes in excellent yields. Competing side reactions are efficiently suppressed by the appropriate choice of reaction conditions.

CLEAVAGE OF METHYLDISILANES TO METHYLMONOSILANES

The invention relates to a process for the manufacture of methylmonosilanes comprising the step of subjecting one or more methyldisilanes to the cleavage reaction of the silicon-silicon bond, and optionally a step of separating the resulting methylmonosilanes.