13452-94-3

Basic information

• Product Name: tetradecamethylheptasilepane
• Synonyms: Tetradecamethylcycloheptasilane
• CAS NO: 13452-94-3
• Molecular Formula: C₁₄H₄₂Si₇
• Molecular Weight: 407.0818
• Mol File: 13452-94-3.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 305.9°C at 760 mmHg
• Flash Point: 101.5°C
• Density: 0.83g/cm³
• Vapor Pressure: 0.00145mmHg at 25°C
• Refractive Index: 1.428
• CAS DataBase Reference: tetradecamethylheptasilepane(CAS DataBase Reference)
• NIST Chemistry Reference: tetradecamethylheptasilepane(13452-94-3)
• EPA Substance Registry System: tetradecamethylheptasilepane(13452-94-3)

Safety Data

• Hazardous Substances Data: 13452-94-3(Hazardous Substances Data)

Upstream product

• 75-78-5 dimethylsilicon dichloride 
• 10124-62-6 1,2-dimethoxy-1,1,2,2-tetramethyldisilane 

Downstream Products

• 4098-30-0 dodecamethylcyclohexasilane 

Relevant articles and documents

Synthesis of α,ω-dihalopermethyloligosilanes and silane-siloxane copolymers

α,ω-Dibromopermethyloligosilanes, Br(SiMe2)nBr (n = 2-4, 6), were prepared by the reaction of dodecamethylcyclohexasilane with bromine. The reaction of (Me2Si)6 with MCl4 (M = Sn, Ti) proceeds with the cleavage of Si-Si-and Si-C-bonds with the formation of α,ω-dichloropermethyloligosilanes, Cl(SiMe2)nCI (n = 2-4, 6), and chloro derivatives of cyclohexasilane, ClmSi6Me12-m (m = 1, 2). Silane-siloxane copolymers of regular structure were obtained by heterofunctional copolycondensation of α,ω-dihalopermethyloligosilanes with 1,5-dihydroxyhexamethyltrisiloxane.

REACTIONS OF 1,2-DIMETHOXYTETRAMETHYLDISILANE WITH STYRENES: FORMATION OF A NEW TYPE OF SILACYCLOPENTANES HAVING PHENYL SUBSTITUENTS ON RING CARBONS

The reaction of 1,2-dimethoxytetramethyldisilane with styrene and α-methylstyrene in the presence of NaOMe catalyst in tetrahydrofuran (THF) gave the new silacyclopentanes 1,1-dimethyl-2,4-diphenyl-1-silacyclopentane (IIIa) and 1,1,2,4-tetramethyl-2,4-diphenyl-1-silacyclopentane (IIIb), respectively.These silacyclopentanes were found to exist as cis-trans mixtures.The use of sodium metal in place of NaOMe afforded similar results.Reactions of a polysilane mixture, MeO(SiMe2)nOMe (n 3), with the styrenes also gave similar results.In some cases, polysilacycloalkanes such as 1,2,3-trisilacyclopentanes (IV) and 1,2,3,4-tetrasilacyclohexanes (V) were obtained as by-products.A mechanism for the formation of the silacyclopentanes and polysilacycloalkanes is presented.It was found that electron impact decomposition of silacyclopentanes IIIa and IIIb, trisilacycloalkane IV and tetrasilacycloalkane V gave molecular ions corresponding to the silacyclopropane, cyclotrisilane and cyclotetrasilane systems.