13452-92-1

Basic information

• Product Name: Cyclopentasilane,decamethyl-
• Synonyms: Cyclopentasilane,decamethyl-
• CAS NO: 13452-92-1
• Molecular Formula: C₁₀H₃₀Si₅
• Molecular Weight: 290.7727
• Mol File: 13452-92-1.mol
• Article Data: 11

Chemical Properties

• Boiling Point: 218.1 °C at 760 mmHg
• Flash Point: 58.3 °C
• Appearance: /
• Density: 0.82 g/cm³
• Vapor Pressure: 0.189mmHg at 25°C
• Refractive Index: 1.423
• CAS DataBase Reference: Cyclopentasilane,decamethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Cyclopentasilane,decamethyl-(13452-92-1)
• EPA Substance Registry System: Cyclopentasilane,decamethyl-(13452-92-1)

Safety Data

• Hazardous Substances Data: 13452-92-1(Hazardous Substances Data)

Usage

InChI:InChI=1/C10H30Si5/c1-11(2)12(3,4)14(7,8)15(9,10)13(11,5)6/h1-10H3

Upstream product

• 75-78-5 dimethylsilicon dichloride 
• 80-10-4 diphenylsilyl dichloride 
• 4098-30-0 dodecamethylcyclohexasilane 
• 286-20-4 cyclohexane-1,2-epoxide 
• 541-05-9 Hexamethylcyclotrisiloxane 
• 1072-43-1 propylene sulphide 
• 64-17-5 ethanol 
• 10124-62-6 1,2-dimethoxy-1,1,2,2-tetramethyldisilane 

Downstream Products

• 4098-30-0 dodecamethylcyclohexasilane 
• 136213-32-6 2,2,3,3,4,4,5,5,6,6-decamethyl-1-(2,6-xylylimino)-2,3,4,5,6-pentasilacyclohexane 

Relevant articles and documents

Chlorine Abstraction from Chloromethanes by Dimethylsilanediyls

Photolysis of dodecamethylcyclohexasilane in carbon tetrachloride gives hexachloroethane; its formation is a result of chlorine abstraction from carbon tetrachloride by dimethylsilanediyl.

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.

Silanones and silanethiones from the reactions of transient silylenes with oxiranes and thiiranes in solution. The direct detection of diphenylsilanethione

The transient silylenes SiMe2 and SiPh2 react with cyclohexene oxide (CHO), propylene oxide (PrO), and propylene sulfide (PrS) in hydrocarbon solvents to form products consistent with the formation of the corresponding transient silanones and silanethiones, respectively. Laser flash photolysis studies show that these reactions proceed via multistep sequences involving the intermediacy of the corresponding silylene-oxirane or -thiirane complexes, which are formed with rate constants close to the diffusion limit in all cases and exhibit UV absorption spectra similar to those of the corresponding complexes with the nonreactive O- and S-donors, tetrahydrofuran and tetrahydrothiophene. The SiMe2-PrO and SiPh2-PrO complexes both exhibit lifetimes of ca. 300 ns, and are longer-lived than the corresponding complexes with CHO, which are both in the range of 230-240 ns. On the other hand, the silylene-PrS complexes are considerably shorter-lived and vary with silyl substituent; the SiMe2-PrS complex decays with the excitation laser pulse (i.e., τ ≥ 25 ns), while the SiPh2-PrS complex exhibits τ = 48 ± 3 ns. The decay of the SiPh2-PrS complex affords a long-lived transient product exhibiting λ max ≈ 275 nm, which has been assigned to diphenylsilanethione (Ph2Si=S) on the basis of its second order decay kinetics and absolute rate constants for reaction with methanol, tert-butanol, acetic acid, and n-butyl amine, for which values in the range of 1.4 × 108 to 3.2 × 109 M-1 s-1 are reported. The experimental rate constants for decay of the SiMe2-epoxide and -PrS complexes indicate free energy barriers (ΔG?) of ca. 8.5 and ≥7.1 kcal mol-1 for the rate-determining steps leading to dimethylsilanone and -silanethione, respectively, which are compared to the results of DFT (B3LYP/6-311+G(d,p)) calculations of the reactions of SiH 2 and SiMe2 with oxirane and thiirane. The calculations predict a stepwise C-O cleavage mechanism involving singlet biradical intermediates for the silylene-oxirane complexes, and a concerted mechanism for silanethione formation from the silylene-thiirane complexes, in agreement with earlier ab initio studies of the SiH2-oxirane and -thiirane systems.

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.