نتایج جستجو برای: triethyl orthoesters
تعداد نتایج: 511 فیلتر نتایج به سال:
The title compound, C(10)H(10)N(2)O(2), was synthesized by the reaction of the oxime of 2-acetyl-pyridine and 3-bromo-propanoyl chloride in the presence of triethyl-amine. The mol-ecule adopts a nearly planar chain-extended conformation with the oxime group in a trans and the acryloyl group in an s-cis conformation. This conformation is stabilized by an intra-molecular C-H⋯N hydrogen bond. The ...
Submit Manuscript | http://medcraveonline.com Abbreviations: HPMC: Hydroxypropyl Methylcellulose; MC: Methylcellulose; PLGA: Poly (Lactide-co-Glycolide); CAP: Cellulose Acetate Phthalate; LCST: Low Critical Solution Temperature; UCST: Upper Critical Solution Temperature; PPO: Polypropylene Oxide; PEO: Polyethylene Oxide; MTA: Methozolamide; PNIPAAm: Poly (N-Isopropylacrylamide); GC: Guluronic A...
methanesulfonic acid (msa) was found to be an efficient catalyst for the synthesis of 1-substituted-1h-1,2,3,4-tetrazoles. a series of 1-substituted tetrazole compounds were synthesized from the reaction of various primary amines, sodium azide and triethyl orthoformate in the presence of catalytic amounts of msa at room temperature. in this protocol, some of the tetrazole derivatives were synth...
The synthesis of 3-amino-1-nitroguanidine (3-ANQ) and 5-hydrazino tetrazole (5-HT) derivatives as new energetic materials are described. Reaction of 3-ANQ with triethyl orthoformate leads to the formation of 3-nitramino triazole while no reaction was observed whit 5-HT. Addition of NaN3 to a mixture of 3-ANQ and triethyl orthoformate, afforded 1-nitroguanidyl tetrazole in excelle...
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