Isomerization of Safrole and Eugenol Under Microwave Irradiation

Abstract: Safrole and eugenol isomerization reactions were carried out under microwave irradiation at atmospheric pressure and homogeneous medium with various alcohols used as solvents and different base concentrations. The rate reaction enhancement shown was 2.3 to 13.2 times faster than conventional reflux.     

A Convenient One-Pot Synthesis of Dibenzyl Diselenides Under Microwave Irradiation Conditions

A simple, rapid and efficient method for the synthesis of dibenzyl diselenides under microwave irradiation is reported. The effect of microwave irradiation power, times and solvent on the reaction is investigated.     

Clay Catalysis: Dry Condensation of Barbituric Acid with Aldehydes Under Microwave Irradiation

Barbituric acid (1) and arylcarboxyaldehydes (2) were condensated to 5-(arylmethylene)-2,4,6 (1H, 3H, 5H) pyrimidinetrione (3)in presence of acidic clay KSF without solvent under microwave irradiation.     

微波辐射FeCl3催化无溶剂条件下的呐醇重排

通过微波辐射, 以FeCl3为催化剂进行无溶剂条件下的呐醇重排反应, 1 min产率可达86%～96%. 该方法具有操作简便、反应时间缩短、对环境友好等优点.     

Synthesis of Thiosemicarbazones Under Microwave Irradiation

Thiosemicarbazones (3) are effectively synthesized in a few minutes by the condensation reaction of aldehydes with thiosemicarbazide under microwave irradiation.     

Synthesis of Guanylhydrazones Under Microwave Irradiation

Abstract

The reaction of aromatic aldehydes and ketones with aminoguanidine hydrochloride under microwave irradiation (MWI) afforded guanylhydrazones in shorter reaction times and improved yield as compared to the conventional methodology.     

利用微波辐射制备2-萘甲醚的合成实验

利用微波辐射的方法合成 2 萘甲醚 ,对微波辐射功率、微波辐射时间、催化剂的用量、反应物的配比对反应产率的影响进行讨论 ,该方法与传统合成方法相比具有反应时间短 ,反应条件温和 ,简单易行 ,无污染的特点     

Improved Synthesis of Oxadiazoles Under Microwave Irradiation

Abstract

Amidoximes (1) reacted with isopropenyl acetate in presence of KSF under microwave irradiation and gave 1,2,4-oxadiazoles (2). 1,2,4-Oxadiazoles (4) can also be obtained by microwave irradiation from O-acylamidoximes (3) adsorbed on Alumina.

1,3,4-Oxadiazoles (6) were obtained by irradiation of bis (acyl) hydrazines (5) in thionyl chloride.     

N-烃基邻苯二甲酰亚胺的微波干法催化合成

在K2 CO3 固体碱催化下 ,利用微波辐射 ,邻苯二甲酰亚胺和卤代烃发生取代反应 ,高产率地合成了N -烃基邻苯二甲酰亚胺     

微波辐射下苯并噁唑基吡啶的合成

在微波辐射条件下,利用邻氨基酚和吡啶羧酸在多聚磷酸中的缩合反应,合成了2种苯并唑基取代吡啶 最佳反应条件为:450W辐射4min 相比于常规反应,反应时间大为缩短且产率令人满意     

微波干法催化环内酰胺N－烷基化反应

微波干法催化环内酰胺Ｎ－烷基化反应王存德，肖东运，张明，田兆斌，张霖（扬州大学工学院扬州２２５００１）关键词微波辐射，环内酰胺，Ｎ－烷基化，卤代烷Ｎ－烷基环内酰胺广泛应用于医药和日用化学品中［１，２］．近年来有关Ｎ－烷基环内酰胺的合成有：碱叔丁醇钾－...     

2,4,6-三芳基吡啶的微波辐射促进合成

微波辐射;查尔酮;缩合反应;吡啶;叶立德     

Selective Iodination of Benzylic Alcohols with KI/H2SO4 Supported on Natural Kaolinitic Clay Under Microwave Irradiation

 Benzylic alcohols are selectively converted into their corresponding iodides using KI/H₂SO₄ supported on natural kaolinitic clay and microwaves.     

Rapid Syntheses of Benzyl Acetate Under Microwave Irradiation

ＲａｐｉｄＳｙｎｔｈｅｓｅｓｏｆＢｅｎｚｙｌＡｃｅｔａｔｅＵｎｄｅｒＭｉｃｒｏｗａｖｅＩｒｒａｄｉａｔｉｏｎＪＩＡＮＧＹｕ－Ｉｉｎ;ＹＵＡＮＹｕｎ－ｃｈｅｎｇ;ａｎｄＳＵＮＹｕｅ－ｈｕａ（ＳｃｈｏｏｌｏｆＣｈｅｍｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ,Ｄａｌ...     

3-甲基吡啶的微波液相法合成

在液相条件下，采用微波协助合成3-甲基吡啶（1），其结构经GC-MS确证。研究了碳源(甘油、丙烯醛二甲缩醛和丙烯醛二乙缩醛)、氨源(硫酸亚铁铵、乙酸铵和氨水)、固体催化剂用量和溶剂(水、离子液体、二乙二醇甲醚、乙二醇丁醚和二甲基亚砜)对1合成反应的影响。结果表明：丙烯醛是重要的中间产物；在多相催化体系下，1收率最高可达到19.8%。     

Clay Catalysis: Dry Condensation of 3-Methyl-1- Phenyl-5-Pyrazolone with Aldehydes Under Microwave Irradiation

3-Methyl-1-phenyl -5-pyrazolone (1) and arylcarboxyaldehydes (2) were condensated to 1-phenyl-3-methyl-4-(arylmethylene)-5-pyrazolone (3) in presence of acidic clay KSF without solvent under microwave irradiation.     

Rapid Synthesis of Alkyloxy Porphyrins Under Microwave Irradiation

Alkyloxy porphyrins have been prepared by direct coupling of 5-para-hydroxyphenyl-10,15,20-triphenylporphyrin and alkyl halides under microwave irradiation within several minutes. The length of the alkyl halides has no obvious effect on the yields and reaction time; however, the steric structure of the alkyl halides has a great impact on the reaction time. All the products were confirmed by ¹H NMR.     

A Rapid and Convenient Synthesis of Derivatives of Imidazoles under Microwave Irradiation

An efficient and a quick microwave‐assisted synthesis of benzimidazoles and trisubstituted imidazoles was developed. Three benzimidazoles were obtained as a result of the condensation of 1,2‐phenylenediamine with carboxylic acids and acetoacetic ester without catalyst. A series of trisubstituted imidazoles were synthesized by condensation of benzil, aromatic aldehyde and ammonium acetate in the presence of glacial acetic acid.     

A Convenient Synthesis of Pyrazole‐imidazoline Derivatives by Microwave Irradiation

A series of 28 hybrids pyrazole‐imidazolines 1a – n and 2a – n were synthesized by a new methodology using microwave irradiation, in short time (20–30 min), in low power (50–70 W), and in 34–92% yield. Among all methodologies evaluated, no side products were obtained. All derivatives were completely characterized by FT–IR, ¹H and ¹³C NMR, GC–MS, and HRMS.