Chemical Properties of 2,2,4,4,6,6-Hexamethyl-8,8-diphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane (CAS 1693-44-3)

InChI

InChI=1S/C18H28O4Si4/c1-23(2)19-24(3,4)21-26(22-25(5,6)20-23,17-13-9-7-10-14-17)18-15-11-8-12-16-18/h7-16H,1-6H3

InChI Key

BOIFXPDTOHPTOD-UHFFFAOYSA-N

Formula

C18H28O4Si4

SMILES

C[Si]1(C)O[Si](C)(C)O[Si](c2ccccc2)(c2ccccc2)O[Si](C)(C)O1

Molecular Weight¹

420.75

CAS

1693-44-3

Other Names

• 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane
• 1,1,3,3,5,5-Hexamethyl-7,7-diphenylcyclotetrasiloxane

• C_p,solid : Solid phase heat capacity (J/mol×K).
• Δ_fusH : Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• logP_oct/wat : Octanol/Water partition coefficient.
• P_c : Critical Pressure (kPa).
• I_np : Non-polar retention indices.
• Δ_fusS : Entropy of fusion at a given temperature (J/mol×K).
• S°_{solid,1 bar} : Solid phase molar entropy at standard conditions (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• T_triple : Triple Point Temperature (K).
• V_c : Critical Volume (m³/kmol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ΔvapH°	87.05	kJ/mol	Relay (1.0) Calculated Property
logPoct/wat	3.428		Crippen Calculated Property
Pc	746.67	kPa	Relay (1.0-beta) Calculated Property
Inp	1883.00		NIST
S°solid,1 bar	[758.60; 758.60]	J/mol×K
S°solid,1 bar	758.60	J/mol×K	NIST
S°solid,1 bar	758.60	J/mol×K	NIST
Tboil	588.87	K	Relay (1.0) Calculated Property
Tc	832.03	K	Relay (1.0) Calculated Property
Tfus	315.21	K	Relay (1.0) Calculated Property
Ttriple	304.96 ± 0.02	K	NIST
Vc	1.288	m3/kmol	Relay (1.0) Calculated Property

Cheméo can also estimate Enthalpy of formation at standard conditions, Standard Gibbs free energy of formation, Acentric Factor, Ionization energy, Log10 of Water solubility in mol/l for this compound, but they fall outside the models' validated range, so they are not shown here. Open the prediction tool to compute them on demand.

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,solid	633.00	J/mol×K	298.15	NIST
ΔfusH	[42.73; 42.73]	kJ/mol	[304.96; 305.09]
ΔfusH	42.73	kJ/mol	304.96	NIST
ΔfusH	42.73	kJ/mol	305.00	NIST
ΔfusH	42.73	kJ/mol	305.09	NIST
ΔfusS	[140.10; 140.10]	J/mol×K	[304.96; 305.09]
ΔfusS	140.10	J/mol×K	304.96	NIST
ΔfusS	140.10	J/mol×K	305.09	NIST

Similar Compounds

Find more compounds similar to 2,2,4,4,6,6-Hexamethyl-8,8-diphenyl-[1,3,5,7,2,4,6,8]cyclotetrasiloxane.

Sources

• Cheméo Relay (1.0)
• Cheméo Relay (1.0, beta) Beta: served but experimental, data-limited and below our cross-validation release bar; the Joback value is recommended where available.
• Crippen Method
• Crippen Method
• NIST Webbook

Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data. The source is also providing more information like the publication year, authors and more. Take the time to validate and double check the source of the data.
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