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68239-27-0

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68239-27-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 68239-27-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,2,3 and 9 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 68239-27:
(7*6)+(6*8)+(5*2)+(4*3)+(3*9)+(2*2)+(1*7)=150
150 % 10 = 0
So 68239-27-0 is a valid CAS Registry Number.
InChI:InChI=1/C8H8ClNO3/c9-5-6(8(12)7(5)11)10-1-3-13-4-2-10/h1-4H2

68239-27-0Relevant articles and documents

Oxocarbons and Related Compounds, VIII. - Squaric Amide Chlorides: Simple Methods of their Preparation and Cyclization of Specially Substituted Representatives to Annulated Cyclobutenediones

Schmidt, Arthur H.,Plaul, Wolfgang,Aimene, Amokrane,Hotz, Monika,Hoch, Monika

, p. 1021 - 1035 (2007/10/02)

Squaric dichloride (1c) reacts with a great number of secondary amines and with several primary amines to afford the squaric amide chlorides 4d-z.A further simple method for the preparation of 4a-d, aa-ac has been found in the reaction of 1c with an equimolar amount of the trimethylsilylamines 9a-ac.On using a twofold molar amount of 4-(trimethylsilyl)morpholine (9d), dimorpholinocyclobutenedione (11) has been obtained.Reaction of hexamethyldisilazane (12) with 1c affords 3-amino-4-chloro-3-cyclobutene-1,2-dione (14).The squaric amide chlorides 4m, u-w suffer intramolecular cyclization by the action of AlCl3 to give the annulated cyclobutenediones 17a-d.The analogous cyclization of 4z yields 18 which is characterized by an sevenmembered ring condensed with the cyclobutenedione unit.

Simple synthesis of amides of semiquadratic acid

Seitz,Morck,Schmiedel,Sutrisno

, p. 361 - 364 (2007/10/10)

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