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Cyclotetrasiloxane, 2,2,6,6-tetramethyl-4,4,8,8-tetraphenyl-, also known as D4, is a cyclic siloxane compound with the chemical formula (C6H5)2Si-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si(C(CH3)3)2-O-Si

1693-48-7

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1693-48-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1693-48-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,9 and 3 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 1693-48:
(6*1)+(5*6)+(4*9)+(3*3)+(2*4)+(1*8)=97
97 % 10 = 7
So 1693-48-7 is a valid CAS Registry Number.

1693-48-7Downstream Products

1693-48-7Relevant academic research and scientific papers

PROCESS FOR THE PRODUCTION OF CYCLOSILOXANES

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Paragraph 0024, (2013/04/10)

Embodiments of the invention are directed to the preparation of a discrete cyclosiloxane or a discrete mixture of cyclosiloxanes where a dihydroxysilane or dihydroxysiloxane condenses with a dihydrosilane or dihydroxysiloxane in the presence of a Lewis acid catalyst in a reaction phase including a solvent. The introduction of the dihydroxysilane or dihydroxysiloxane and dihydrosilane or dihydroxysiloxane is controlled such that the cyclocondensation occurs in a reaction phase that is dilute in the SiH and SiOH functionality permitting the isolation of the monocyclocondensation adduct in high yield with little higher molecular weight condensation products. In one embodiment of the invention 1,1-diphenyl-3,3,5,5-tetramethylcyclotrisiloxane is prepared in very high yield.

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