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556-68-3

Basic Information
CAS No.: 556-68-3
Name: hexadecamethylcyclooctasiloxane
Article Data: 9
Molecular Structure:
Molecular Structure of 556-68-3 (hexadecamethylcyclooctasiloxane)
Formula: C16H48 O8 Si8
Molecular Weight: 593.236
Synonyms: Cyclooctasiloxane,hexadecamethyl- (7CI,8CI,9CI); Hexadecamethylcyclooctasiloxane
Density: 0.97g/cm3
Melting Point: 31.5°C
Boiling Point: 290°Cat760mmHg
Flash Point: 175.2°C
PSA: 73.84000
LogP: 5.74720
Synthetic route

C16H48Cl2O7Si8

556-68-3

hexadecamethylcyclooctasiloxane

Conditions
ConditionsYield
In diethyl ether; water at 20 - 30℃; Alkaline conditions;56%
3277-26-7

1,1,3,3-Tetramethyldisiloxane

540-97-6

dodecamethyl-cyclohexasiloxane

A

107-50-6

tetradecamethylcycloheptasiloxane

B

556-68-3

hexadecamethylcyclooctasiloxane

C

2441-21-6

iododimethylsilane

Conditions
ConditionsYield
With iodineA 22%
B 12%
C n/a
78-62-6

diethoxy dimethylsilane

556-68-3

hexadecamethylcyclooctasiloxane

Conditions
ConditionsYield
With hydrogenchloride Kochen der erhaltenen Reaktionsprodukte mit 20prozentig. wss. HCl;
With hydrogenchloride
75-78-5

dimethylsilicon dichloride

556-68-3

hexadecamethylcyclooctasiloxane

Conditions
ConditionsYield
With water
109-72-8, 29786-93-4

n-butyllithium

541-05-9

Hexamethylcyclotrisiloxane

[(η7-C7H6)Ti(η5-C5H4)](OSiMe2)(SiMe2)

A

107-50-6

tetradecamethylcycloheptasiloxane

B

556-68-3

hexadecamethylcyclooctasiloxane

C

[(η7-C7H6)Ti(η5-C5H4)](OSiMe2)2(SiMe2)

D

C23H40OSi3Ti

Conditions
ConditionsYield
Stage #1: n-butyllithium; [(η7-C7H6)Ti(η5-C5H4)](OSiMe2)(SiMe2) In tetrahydrofuran at 20℃; for 2h;
Stage #2: Hexamethylcyclotrisiloxane With chloro-trimethyl-silane In tetrahydrofuran for 2h;
4098-30-0

dodecamethylcyclohexasilane

A

107-50-6

tetradecamethylcycloheptasiloxane

B

556-68-3

hexadecamethylcyclooctasiloxane

C

556-71-8

octadecamethyl cyclononasiloxane

D

541-05-9

Hexamethylcyclotrisiloxane

E

556-67-2

octamethylcyclotetrasiloxane

F

541-02-6

decamethylcyclopentasiloxane

G

540-97-6

dodecamethyl-cyclohexasiloxane

H

4938-87-8

1,1,3,3,5,5,7,7,9,9,11,11,13,13,15,15-hexadecamethyloctasiloxane-1,15-diol

I

4029-00-9

1,1,3,3,5,5,7,7,9,9,11,11-dodecamethylhexasiloxane-1,11-diol

J

C30H92O16Si15

K

18772-36-6

eicosamethylcyclodecasiloxane

L

18919-94-3

tetracosamethyl cyclododecasiloxane

M

23523-14-0

Tricontamethylcyclopentadecasiloxan

N

3195-63-9

α,ω-Dihydroxy-tetradecamethyl-heptasiloxan

O

18766-38-6

Docosamethylcycloundecasiloxane

P

α,ω-Dihydroxy-polydimethylsiloxan

Q

23732-94-7

hexacosamethyl-cyclotridecasiloxane

R

149050-40-8

Octacosamethylcyclotetradeca-siloxane

S

18678-58-5

α,ω-Dihydroxy-octadecamethyl-nonasiloxan

T

1,1,3,3,5,5,7,7,9,9,11,11,13,13,15,15,17,17,19,19,21,21,23,23,25,25,27,27,29,29,31,31-dotriacontamethylhexadecasiloxane-1,31-diol

U

Dotriacontamethylcyclohexadecasiloxane

V

tetratriacontamethylcycloheptadecasiloxane

W

C22H68O12Si11

X

C24H74O13Si12

Y

C34H104O18Si17

Z

permethyldecasiloxane-1,19-diol

[

C28H86O15Si14

Conditions
ConditionsYield
Stage #1: dodecamethylcyclohexasilane With potassium tert-butylate In tetrahydrofuran at 20℃; for 0.5h; Inert atmosphere; Schlenk technique;
Stage #2: With hydrogen; C62H51N2Ni2(1-)*K(1+)*2C4H10O2 In tetrahydrofuran at 45℃; under 1500.15 Torr; for 24h; Schlenk technique;
Stage #3: With water In tetrahydrofuran at -40 - 20℃; for 12h; Schlenk technique;
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