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排序方式: 共有96条查询结果,搜索用时 125 毫秒
1.
Fatemeh F. Bamoharram Majid M. Heravi Mina Roshani Ali Gharib Manouchehr Jahangir 《中国化学会会志》2007,54(4):1017-1020
Synthesis of aspirin at room temperature via O‐acetylation of salicylic acid in the presence of Preyssler type heteropolyacids has been investigated in order to contribute toward clean technology, which is the most important need of the society. All of the catalysts are recyclable and reusable. 相似文献
2.
3-(2-Acetylphenyl)sydnone oxime 1a reacts with acids (methanesulfonic-, p-toluenesulfonic, trifluoroacetic-acid or Amberlite IR 118) to give products apparently derived from protonation of the oxime oxygen or nitrogen atom followed by cyclization to the sydnone ring or interception by water. 相似文献
3.
Farhad Shirini Manouchehr Mamaghani Seyyed Vahid Atghia 《Journal of the Iranian Chemical Society》2013,10(3):415-420
Nanoporous Na+-montmorillonite sulfonic acid was found to be an efficient and green catalyst for the synthesis of various 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-dodecahydroxanthene derivatives by the reaction of aldehydes with 2-naphthol and 1,3-cyclohexanedione, respectively. This novel synthetic method has the advantages of high yields, short reaction times and recyclability of the catalyst, simplicity and easy workup compared to the conventional methods reported in the literature. 相似文献
4.
5.
Manouchehr Mamaghani Abed Badrian 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2429-2435
The hydroxy group of the Baylis-Hillman adducts is protected with the t-butyldimethylsilyl (TBDMS) group using the reaction of adducts 1a–h with tert-butyldimethylsilyl chloride (TBDMSCl) in the presence of lithium sulfide under nearly acidic reaction conditions. 相似文献
6.
Synthesis of dibenzoxanthenes through condensation of β-naphthol with various aromatic and aliphatic aldehydes in ethanol as an ecofriendly solvent using RuIII as catalyst is reported.
7.
M. Mamaghani 《Mathematical Notes》2002,71(3-4):392-399
In this paper, a complete finite rewriting system is constructed for Coxeter groups of the form $$W = \left\langle {a,b,c|a^2 = b^2 = c^2 = (ab)^p = (bc)^q = (ca)^r = 1} \right\rangle $$ with respect to the system of generators $S = \{ a,b,c\} $ , where $p,q,r \in \mathbb{Z}$ , $p,q,r \geqslant 2$ , and $1/p + 1/q + 1/r < 1$ . Rewriting systems of this kind can be used to evaluate the complete growth series of a group. 相似文献
8.
<正>The first three-component and regioselective synthesis of pyridazinones and phthalazinones from arenes,anhydrides and ArNHNH_2 in the presence of efficient recyclable heterogeneous catalyst,montmorillonite-KSF,in high yield and short reaction time is reported. 相似文献
9.
Mohammad Nikpassand Manouchehr Mamaghani Mohammad Ali Zanjanchi Nosrat Olah Mahmoodi Massomeh Mirzaeinejad 《中国化学快报》2010,21(1):5-8
<正>A facile and convenient protocol was developed for the synthesis of 1,5-diarylpyrazoles using Baylis-Hillman adducts in the presence of HY-zeolite as an efficient recyclable heterogeneous catalyst in reasonable reaction times(1.5-2.5 h) and high yields (78-90%). 相似文献
10.
Manouchehr Saljoughian 《Monatshefte für Chemie / Chemical Monthly》1983,114(4):509-511
Oxidation of alcoholsR-CHD-OH by CrO3/pyridine gave the aldehydesR-CDO with a relatively small loss of D thus indicating a pronounced isotope effect. 相似文献