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EINECS 217-496-1
CAS No. 1873-88-7 Density 0.819 g/cm3
Solubility Melting Point <0 °C
Formula C7H22O2Si3 Boiling Point 163.8 °C at 760 mmHg
Molecular Weight 222.51 Flash Point 52.8 °C
Transport Information UN 1993 3/PG 2 Appearance Colourless liquid
Safety 26-36 Risk Codes 10-36/37/38
Molecular Structure Molecular Structure of 1873-88-7 (Trisiloxane,1,1,1,3,5,5,5-heptamethyl-) Hazard Symbols IrritantXi

1,1,1,3,5,5,5-Heptamethylsiloxane;1,1,1,3,5,5,5-Heptamethyltrisiloxane;2,2,4,6,6-Pentamethyl-3,5-dioxa-2,4,6-trisilaheptane;Bis(trimethylsilyloxy)methylsilane;Heptamethylhydrotrisiloxane;Methylbis(trimethylsiloxy)silane;Methylbis(trimethylsilyloxy)silane;SIB 1844;Di(trimethylsiloxy)methylsilane;


Bis(trimethylsiloxy)methylsilane Specification

The Trisiloxane,1,1,1,3,5,5,5-heptamethyl- with CAS registry number of 1873-88-7 is also known as 1,1,1,3,5,5,5-Heptamethyltrisiloxane. The IUPAC name is Methyl-bis(trimethylsilyloxy)silicon. It belongs to product categories of Industrial/Fine Chemicals; Si (Classes of Silicon Compounds); Siloxanes; Si-O Compounds; Organometallic Reagents; Organosilicon. Its EINECS registry number is 217-496-1. In addition, the formula is C7H22O2Si3 and the molecular weight is 222.51. This chemical is a colourless liquid and should be stored in sealed containers in cool, dry place and away from oxidizing agents.

Physical properties about Trisiloxane,1,1,1,3,5,5,5-heptamethyl- are: (1)ACD/LogP: 5.32; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 5.32; (4)ACD/LogD (pH 7.4): 5.32; (5)ACD/BCF (pH 5.5): 6517.53; (6)ACD/BCF (pH 7.4): 6517.53; (7)ACD/KOC (pH 5.5): 18694.43; (8)ACD/KOC (pH 7.4): 18694.43; (9)#H bond acceptors: 2; (10)#Freely Rotating Bonds: 4; (11)Flash Point: 52.8 °C; (12)Enthalpy of Vaporization: 38.38 kJ/mol; (13)Boiling Point: 163.8 °C at 760 mmHg; (14)Vapour Pressure: 2.66 mmHg at 25 °C.

Preparation of Trisiloxane,1,1,1,3,5,5,5-heptamethyl-: it is prepared by reaction of dichloro-methyl-silane with chloro-trimethyl-silane. The reaction needs reagent ice and solvent diethyl ether for 1 hour. The yield is about 68%.

Trisiloxane,1,1,1,3,5,5,5-heptamethyl- is prepared by reaction of dichloro-methyl-silane with chloro-trimethyl-silane.

Uses of Trisiloxane,1,1,1,3,5,5,5-heptamethyl-: it can be used as surfactant, and widely used as additive of pesticide and paint. It is used to produce 3-(N-trimethylsilyl-3-aminopropyl)heptamethyltrisiloxane by reaction with allyl-trimethylsilanyl-amine. The reaction occurs with reagent H2PtCl6*6H2O and solvent tetrahydrofuran at 120-145 °C. The yield is about 54%.

Trisiloxane,1,1,1,3,5,5,5-heptamethyl- is used to produce 3-(N-trimethylsilyl-3-aminopropyl)heptamethyltrisiloxane by reaction with allyl-trimethylsilanyl-amine.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating to eyes, respiratory system and skin. Besides, it is flammable. During using it, wear suitable protective clothing. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
1. Canonical SMILES: C[Si](O[Si](C)(C)C)O[Si](C)(C)C
2. InChI: InChI=1S/C7H21O2Si3/c1-10(8-11(2,3)4)9-12(5,6)7/h1-7H3

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