By reacting them with an amine compound and an acid or base; herbicidesdoi:US6140270 AAn improved process for the preparation of 6-(perfluoroalkyl)uracil compounds having the structural formula I ##STR1## from 2-(N,N-disubstituted)amino-4-(perfluoroalkyl)-1,3-oxazin-6-one compounds having ...
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Spatial arrangement and acid strength effects on acid-base cooperatively catalyzed aldol condensation on aminosilica materials Weak acids are known to enhance the activity of amines in aldol condensation reactions on silica-based catalysts. The effects of acid strength and arrangem... Lauwaert, Jeroen...
N-dimethylbenzenamine. When another functional group of thecompoundhas a higher priority than the amino group (―NH2, ―NHR, or ―NR2), the latter is named as a substituent, as in aminoaceticacid, NH2―CH2COOH, and 2-(dimethylamino)ethanol, (CH3)2N―CH2CH2OH. (The simple guidelines ...
an aminedehydrogenasethat allows for the direct asymmetricaminationofketoneswith ammonia was created bymutagenesisof anl-amino aciddehydrogenase. Another trend in chiral amine chemistry is the development of strategies allowing for the synthesis ofsecondary amines. For example the smart choice of substrates...
192 The guanidine catalyst was considered to possess an acid-base dual function, and the double hydrogen-bonding interactions are crucial to accelerate the present (3 + 2) cycloaddition reaction. Experimental evidence supported a concerted pathway for this reaction as the 1,4-Michael addition by...
Vivofectamine Delivery Solutions are highly advanced lipid nanoparticles (LNPs) that have been selected from a large, diverse lipid library and extensively screened for performance, safety and efficacy. Designed especially for selectively and efficiently delivering nucleic acid payloads to a...
Reactivity ProfileTriisopropanolamine neutralizes acids to form salts plus water in exothermic reactions. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen is generated by combination with strong reducin...
aA novel solid acid-base catalyst with aluminum and nitrogen were prepared from aluminum and amine by using triblock copolymer Pluronic F127 as a template and resol as framework via evaporation induced organic–organic assembly method. 有铝和氮的一种新固态基于酸的催化剂从铝和胺准备所作使用 triblock...
Addition of a stronger acid or base as a minor component of the mobile phase often dramatically improves peak shapes as shown for propranolol. There appear to be several different possible mechanisms behind suppression of peak tailing but few systematic studies have been published. In general, the...