19432-95-2Relevant articles and documents
Thermosensitive recording material and novel color developer compounds
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, (2008/06/13)
Disclosed is a thermosensitive recording material comprising a sheet-shaped support and a thermosensitive recording layer which is formed on at least one surface of the support and comprises a colorless or light-colored dye precursor and a color developer capable of reacting with the dye precursor and inducing color formation therein upon application of heat thereto, the color developer comprising a compound represented by the following formula (I) or analog thereof:: The thermosensitive recording material has high sensitivity and can prevent white background portions from coloring and recorded images from decolorizing in an environmental resistance test.
A simple and rapid preparation of sulfones from alkyl halides using ultrasound
Biswas,Jash,Bhattacharyya
, p. 491 - 492 (2007/10/02)
Appropriate alkyl halides and sodium p-toluenesulfinates react rapidly in DMF-water at room temperature under the influence of ultrasound to afford sulfones. Using this procedure a wide variety of sulfones have been prepared.
Piperazine derivatives of theophylline and theobromine
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, (2008/06/13)
New compounds of formulas I and II STR1 and the pharmaceutically acceptable acid addition salts thereof, wherein M is selected from the group consisting of hydrogen, morpholino, benzylamino, di-n-lower alkylamino, n-lower alkylamino and STR2 wherein Ar is
MODERN FRIEDEL-CRAFTS CHEMISTRY. XI. CYCLIZATION OF ARYL HALOALKYL SULFONES, ARYLSULFONYLACYL CHLORIDES AND THEIR CORRESPONDING SULFIDES
Abdel-Wahab, Aboel-Magd A.,El-Khawaga, Ahmed M.,El-Zohry, Maher F.,Khalaf, Ali A.
, p. 31 - 44 (2007/10/02)
The sulfone group deactivation for cyclialkylation and cycliacylation reactions in the presence of Friedel-Crafts catalysts was demonstrated in a number of aryl chloroalkylsulfones (1-8) and arylsulfonylacyl chlorides (17a-22a), respectively.As expected, the corresponding arylchloroalkyl sulfides (9-16) and arylmercaptoacyl chlorides (13a-28a) underwent ring-closure reaction in most cases under the same conditions.The ease of cyclization was governed by the ring size, the stability of the attacking carbocation and the nucleophilicity of the aryl moiety.Also, the behaviour of benzyl sulfones (29, 31a, and 32a) and sulfides (33, 34a and 36a) was inconsistent.Noteworthy, the Friedel-Crafts cyclization reaction is thus considered an accessible method for the synthesis of compounds 37-41 and 45, 51.