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5,5'-dihydro-5-oxo-diphthalylidene, also known as 5,5'-spirobi[1,3-dioxane]-2,2',6,6'-tetraone, is a chemical compound with the molecular formula C14H8O6. It is a white crystalline solid that is soluble in organic solvents such as ethanol and acetone. 5,5'-dihydro-5-oxo-diphthalylidene is formed by the condensation of two phthalic anhydride molecules through a Diels-Alder reaction, resulting in a spirobi compound with a unique cyclic structure. 5,5'-dihydro-5-oxo-diphthalylidene has potential applications in the synthesis of various organic compounds and materials, such as polymers and pharmaceuticals, due to its reactive nature and ability to form stable intermediates.

2289-05-6

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2289-05-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2289-05-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,8 and 9 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 2289-05:
(6*2)+(5*2)+(4*8)+(3*9)+(2*0)+(1*5)=86
86 % 10 = 6
So 2289-05-6 is a valid CAS Registry Number.

2289-05-6SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name 5,5'-dihydro-5-oxo-diphthalylidene

1.2 Other means of identification

Product number -
Other names 1-hydroxy-1H,1'H-[1,1']biisobenzofuranyl-3,3'-dione

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
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More Details:2289-05-6 SDS

2289-05-6Upstream product

2289-05-6Downstream Products

2289-05-6Relevant academic research and scientific papers

A ONE POT REACTION INVOLVING HYDROLYSIS-REDUCTION OF BIPHTHALYLIDENE IN AN ALKALINE MEDIUM

Tashiro, Masashi,Sumida, Tsuyoshi,Fukata, Gouki

, p. 657 - 660 (2007/10/02)

The hydrolysis of biphthalylidene (2) in varying alkaline medium afforded selectively 2,2'-dicarboxybenzoin (3) or 5,5'-dihydro-5-oxo-diphthalylidene (4) in good yields depending upon the conditions used.In one pot reaction involving hydrolysis of 2 followed by reduction with Raney-alloys, 4b,10b-dihydrobenzopyranobenzopyrano-6,12-dione (9) was almost selectively obtained in good yields.In the case of the combination of hydrolysis in 10percent KOH aq and Al-Ni alloy reduction, 2,2'-dicarboxybibenzyl (8) yielded in 51percent as a sole product.

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