Detail of "15721-05-8"

CAS Number:
15721-05-8
Name:
Cyclotetrasiloxane,2,2,4,4,6,6,8-heptamethyl-
Molecular Structure:
Formula:
C₇H₂₂O₄Si₄
Molecular Weight:
282.59
Synonyms:
1,3,3,5,5,7,7-Heptamethylcyclotetrasiloxane;Heptamethylcyclotetrasiloxane;Cyclotetrasiloxane,heptamethyl- (6CI,7CI,8CI,9CI);
Melting Point:
-27 °C
Boiling Point:
174.3 °C at 760 mmHg
Flash Point:
59.2 °C
Risk Codes:
10
Safety:
16 Details

Display：

HEPTAMETHYLCYCLOTETRASILOXANE

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Synthesis of a new silicone rubber with N,N-bisallyl-g-aminopropyl side chains: Synthesis of a new silicone rubber with N,N-bisallyl-g-aminopropyl side chains. Du, Zuodong; Yu, Jing (Chem. Dep., Shandong Univ. 15721-05-8 is the cas registry number. This chemical is also mentioned in this article., Jinan, Peop. Rep. China). Hecheng Xiangjiao Gongye, 9(6), 388-92 (Chinese) 1986. CODEN: HXGOEA. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Heptamethylcyclotetrasiloxane (I) [15721-05-8] was treated with triallylamine [102-70-5] to give heptamethyl-N,N-bisallyl-g-aminopropylcyclotetrasiloxane [106246-29-1], which was polymd. with I to give the title silicone rubber. The rubber could be cured with peroxide or Pt catalyst in the presence of H-contg. silicone oil. The rubber showed autovulcanization and could be vulcanizable via salt formation with organohalides. .

Sulfolanyloxyalkyl organopolysiloxanes: Sulfolanyloxyalkyl organopolysiloxanes. Schilling, Curtis Louis, Jr. (Union Carbide Corp., USA). Ger. Offen. DE 2629137 3 Feb 1977, 20 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07F007-08.Several reagents with their cas registry numbers 52232-27-6 and 62267-83-8 are used here. PRIORITY: US 75-592092 30 Jun 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Sulfolanyloxyalkyl-substituted organopolysiloxane-polyoxyalkylene copolymers are useful foam stabilizers for the manuf. of polyurethane foams. Thus, treatment of heptamethylcyclotetrasiloxane [15721-05-8] with 3-allyloxysulfolane [35309-86-5] in the presence of a Pt catalyst gave 3-(sulfolan-3-yloxy)propylheptamethylcyclotetrasiloxane (I) [62267-83-8]. A mixt. of hexamethyldisiloxane 0.7, cyclic dimethylsiloxane tetramer 9.7, poly(methyl hydrogen siloxane) 1.5, and I 18.8 g was stirred 22 h at room temp. and the product was neutralized with NaHCO3, treated with activated charcoal, and worked up to give Me3SiO(Me2SiO)62(MeRSiO)10(MeSiO)6SiMe, where R = (3-sulfolan-3-yloxy)propyl. The polymethylsiloxane was treated with CH2:CHCH2(OCH2CH2)26.4(OCH2CHMe)30OMe [52232-27-6] to give a block copolymer useful as a stabilizer for the manuf. of flexible polyester polyol foams. .