منابع مشابه
Reaction of Silk Fibroin with Diazomethane
The treatment of silk with an ethereal solution of diazometbane result ed in a rapid decrease in tyrosine content, with no appreciable d ecrease in tensile strength <o f the fibers . The results indicate that the hydroxyl groups of tyrosine in the 'Untreated fibers are free. The total methoxyl content after treatment of the fiber for 25 hours or longer was greater than could be accounted for by...
متن کاملAqueous-sensitive reaction sites in sulfonic acid-functionalized mesoporous silicas
Local differences in surface hydrophilicities/hydrophobicities of propyland arene-sulfonic-acid modified mesoporous silica and organosilica catalysts have been compared and correlated with their bulk catalytic properties for aqueous-sensitive organic reactions. Syntheses of propyland arene-SO3H-modified mesoporous silicas and organosilicas yield materials with different hydrophilicities, especi...
متن کاملReactions of Diazomethane with Sulfonyl-activated Double Bonds
The cyclo-addition reaction of diazomethane with a,/3-unsaturated sulfones is described. Divinyl sulfone and phenyl vinyl sulfone give 1or 2-pyrazolines depending on the reaction conditions. cisand /rans-l,2-Bis(methylsulfonyl)ethene form pyrazolines, which on reaction with either triethylamine or excess of diazomethane lead to substituted pyrazoles. The addition of diazomethane to doüble bonds...
متن کاملReactions of Diazomethane with Sulfonyl-activated Double Bonds
The cyclo-addition reaction of diazomethane with a,/3-unsaturated sulfones is described. Divinyl sulfone and phenyl vinyl sulfone give 1or 2-pyrazolines depending on the reaction conditions. cisand /rans-l,2-Bis(methylsulfonyl)ethene form pyrazolines, which on reaction with either triethylamine or excess of diazomethane lead to substituted pyrazoles. The addition of diazomethane to doüble bonds...
متن کاملReactions of 9H-Fluorene-9-thione with (Trimethylsilyl)- diazomethane*
The [3+2]-cycloaddition of (trimethylsilyl)diazomethane (7) with 9H-fluorene-9-thione (1) at –60°C yields the spirocyclic 2,5-dihydro-5-trimethylsilyl-1,3,4-thiadiazole 10, which eliminates nitrogen at room temperature to give the 1,4-dithiane derivative 13 by dimerization of the intermediate fluorenethione (trimethylsilyl)methanide (11). This thiocarbonyl ylide can be trapped by 1 to give the ...
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ژورنال
عنوان ژورنال: NIPPON KAGAKU KAISHI
سال: 1973
ISSN: 2185-0925,0369-4577
DOI: 10.1246/nikkashi.1973.1374