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CAS No. 15721-05-8 Density 0,958 g/cm3
PSA 36.92000 LogP 2.02210
Solubility N/A Melting Point -27 °C
Formula C7H22O4Si4 Boiling Point 174.3 °C at 760 mmHg
Molecular Weight 282.591 Flash Point 59.2 °C
Transport Information N/A Appearance N/A
Safety 16 Risk Codes 10
Molecular Structure Molecular Structure of 15721-05-8 (HEPTAMETHYL CYCLOTETRASILOXANE) Hazard Symbols R10:;

1,3,3,5,5,7,7-Heptamethylcyclotetrasiloxane;Heptamethylcyclotetrasiloxane;Cyclotetrasiloxane,heptamethyl- (6CI,7CI,8CI,9CI);

Article Data 1

Cyclotetrasiloxane,2,2,4,4,6,6,8-heptamethyl- Specification

The Cyclotetrasiloxane,2,2,4,4,6,6,8-heptamethyl- is an organic compound with the formula C7H22O4Si4. The systematic name of this chemical is 2,2,4,4,6,6,8-Heptamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocane. With the CAS registry number 15721-05-8, it is also named as Heptamethyl cyclotetrasiloxane. Besides, its molecular weight is 282.59.

Physical properties about Cyclotetrasiloxane,2,2,4,4,6,6,8-heptamethyl- are: (1)#H bond acceptors: 4; (2)Polar Surface Area: 36.92 Å2; (3)Flash Point: 59.2 °C; (4)Enthalpy of Vaporization: 39.38 kJ/mol; (5)Boiling Point: 174.3 °C at 760 mmHg; (6)Vapour Pressure: 1.62 mmHg at 25 °C.

Preparation: this chemical can be prepared by Dichloro-dimethyl-silane. This reaction is a kind of Cyclization. This reaction will need solvents diethyl ether; H2O. The reaction time is 1 hour with reaction temperature of 0 - 5 °C. The yield is about 60%.

Uses of Cyclotetrasiloxane,2,2,4,4,6,6,8-heptamethyl-: it can be used to produce Chloro-heptamethyl-cyclotetrasiloxane at temperature of 4 - 5 °C. This reaction is a kind of Chlorination. It will need reagent Cl2 and solvent CCl4. The yield is about 96%.

When you are using this chemical, please be cautious about it as the following:
It is flammable. When you are using it, keep away from sources of ignition - No smoking.

You can still convert the following datas into molecular structure:
(1)InChI: InChI=1/C7H22O4Si4/c1-12-8-13(2,3)10-15(6,7)11-14(4,5)9-12/h12H,1-7H3
(3)Std. InChI: InChI=1S/C7H22O4Si4/c1-12-8-13(2,3)10-15(6,7)11-14(4,5)9-12/h12H,1-7H3

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LDLo oral 3gm/kg (3000mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1228, 1986.

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