硫代糠酸乙酯和硫代糠酸糠酯的合成

以糠酰氯、乙硫醇、糠硫醇为原料，合成了硫代糠酸乙酯和硫代糠酸糠酯，产率分别为７７％和７４％。测定了硫代糠酸乙酯的沸点、折光率及硫代糠酸糠酯的熔点、沸点。对合成的硫代糠酸乙酯进行了评香鉴定     

香料硫代丙酸糠酯的合成

以糠硫醇和丙酰氯为原料,用氧化钙和碳酸钠为复合缚酸剂,合成了香料硫代丙酸糠酯,并用IR、元素分析等进行了表征。优化条件为:n(糠硫醇)∶n(丙酰氯)=1.0∶1.2,缚酸剂用量为160 g/mol糠硫醇,缚酸剂的组成为m(CaO)∶m(Na2CO3)=1∶1,在苯中回流反应4 h。硫代丙酸糠酯产率为89.4%。     

硫代甲酸糠酯的合成研究

本文以甲酸乙酐混和物与糠硫醇反应，合成了较高产率的硫代甲酸糠酯，并对产品进行了结构鉴定和评香鉴定。     

硫代锑酸锑的合成研究

简述了硫代锑酸锑的基本性能及合成工艺,在专利方法的基础上对硫代锑酸锑的合成工艺进行了改进,获得了满意结果。     

含硫香料——硫代香茅醇,硫代芳樟醇的合成研究

对香茅醇转化为硫代香茅醇及芳樟醇转化为硫代芳樟醇的合成方法及影响因素进行了研究。产品在极低浓度时，硫代香茅醇具有酸杨梅、番石榴的香韵，硫代芳樟醇具有橙桔香韵。     

SO4^2—／ZrO2—Al2O3催化合成糠酸酯类香料的研究

以固体超强酸ＳＯ４＾２－／ＺｒＯ２－Ａｌ２Ｏ３为催化剂合成糠酸酯类香料。通过对催化剂制备的正交试验，优选了催化剂的制备条件，通过正交试验优化了糠酸酯化的条件；以糠酸０．１ｍｏｌ为准，催化剂用量０．６ｇ，酸醇摩尔比１：３，反应时间４ｈ，并以此条件合成了糠酸甲酯，乙酯，丁酯三种糠酸酯类香料。     

糠酸甲酯的合成研究

概述了糠酸甲酯的性质，香气特征和应用，通过康尼查罗反应和酯化反应合成了糠酸甲酯，考察了原料配比，催化剂用量和反应时间等对糠酸甲酯产率的影响，并得到了最优化反应条件。     

二硫化钠法合成巯基乙酸的研究

概述了巯基乙酸的用途、合成方法 ,研究了二硫化钠法合成巯基乙酸的主要影响因素。实验从硫化钠、硫磺等基本原料出发 ,首先制得二硫化钠溶液 ,然后将二硫化钠同氯乙酸钠反应合成二硫代甘醇酸 ,最后用硫化钠溶液还原得到巯基乙酸。试验探讨了反应物料配比、反应温度、pH值、反应时间等因素对反应转化率的影响 ,实验结果表明该法的转化率可达 96 %左右 ,其具体反应条件如下 :硫化钠∶硫∶氯乙酸钠 (mol) =1.2∶1.4 4∶1.0 0 ,pH值 =7.5,合成二硫代甘醇酸的温度为 35℃ ,时间为 30min     

5-(2-苯基-1,2,3-三唑-4-次甲基)巴比妥酸及硫代巴比妥酸的合成

巴比妥酸和硫代巴比妥酸及其衍生物是一类具有重要生理活性的含氮杂环化合物,其中5-次甲基(硫代)巴比妥酸是合成药物和杂环化合物的重要中间体.三唑类化合物具有抗菌消炎、抗癌、抗病毒、植物生长调节等活性,被广泛应用于医药、农药方面.     

硫代二甘醇的合成

本文以氯乙醇与硫化钠为原料,详细记述了硫代二甘醇的合成及提纯过程。本文将传统工艺进行优化,采用无水、无酸法,合成过程易于控制、提纯方法简单易行,在得到高纯度产品的同时大大提高了收率。经此方法合成的硫代二甘醇收率大于90%,纯度在99.5%以上。     

糠酸糠酯的合成研究

以糠醛为原料，经歧化、酰氯化、酯化合成了糠酸糠酯，产物结构经IR,^1HNMR表征。同时研究了催化剂用量、投料比、反应时间、反应温度、滴液时间对酯化反应产率的影响，获得了最优化的反应条件。糠酸糠酯的产率为74.65％。     

Cellulose furoate. III. Properties and applications

Cellulose furoates synthesized by a homogeneous reaction was used to make film and fiber. Either colorless or light yellow, transparent cellulose furoate film can be made by solvent cast. Cellulose furoate film with a DS of 2.56 and 20% PEG-400 as the plasticizer displayed 5441 psi maximum tenacity and 21.5% maximum strain. The film without plasticizer has a water vapor permeability of 0.124 ng · m/m² · s · Pa. DMTA study identified the T_g of cellulose furoate with a DS of 2.77 was 225°C. As the DS decreased, the T_g shifted toward higher temperature. The success of wet-spun fibers from LiCl/DMAc solution of cellulose and cellulose furoate substantiated cellulose furoate is compatible with cellulose. Unfortunately, the wet-spun fibers lost their mechanical and surface properties, and bioresistant property against Myrothecium verrucaria, Cheatomium globosum, and Aspergillus terreus. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 253–257, 2001     

香料糠酸甲酯的新法合成与表征

从糠醛出发 ,由制备的糠酸和甲醇反应 ,在盐酸催化下 ,合成了香料糠酸甲酯 ,并用IR、1HNMR、GC等进行了表征 ;探讨了包括高纯度糠酸的制备在内的反应影响因素 ,在醇酸物质的量之比为 5∶1、催化剂体积占甲醇体积 13.0 %、反应时间 3h的最佳工艺条件下 ,酯化收率为81 0 % ,收率比硫酸法、某些固体超强酸法高     

浓硫酸、过氧化氢催化合成糠酸甲酯

从浓Ｈ２ＳＯ４，３０％Ｈ２Ｏ２为催化剂合成糠酸甲酯，苯做萃取剂，萃取提取酯化产物，反应快，收率８３％。     

Cellulose furoate. I. Synthesis in homogeneous and heterogeneous systems

Cellulose furoate was synthesized via heterogeneous and homogeneous reactions. Cotton cellulose and wood cellulose were used. Lithium chloride/dimethylacetamide solvent was used to dissolve the cellulose for the homogeneous reaction. The esterification reaction between cellulose and 2‐furoyl chloride was systematically studied. It revealed that the activation of cellulose was important for its esterification reaction. Activation by solvent exchange decreased the crystallinity and increased the accessibility of cellulose. X‐ray diffraction analysis showed no significant change in the spectrogram after activation of cellulose. The degree of substitution of cellulose furoate was influenced by the molecular weight of the cellulose, the stoichiometry of the reagents, the acid scavenger, and the reaction time. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2649–2655, 2001     

食用香料糠酸酯的催化合成研究

本文以固体超强酸为催化剂合成糠酸酯类香料。通过正交试验优化了糠酯酯化的条件:催化剂用量0.6g、酸醇比1:3、反应时间 4h,并以此条件合成了糠酸甲酯、乙酯、丁酯三种糠酸酯类香料。     

新型香料—─糠酸乙酯的合成

采用浓Ｈ２ＳＯ４作催化剂，苯作分水剂油水分离脱水法合成糠酸乙酯，产率可达８７％。     

SO42-/ZrO2-Al2O3催化合成糠酸酯类香料的研究

以固体超强酸SO42-/ZrO2-Al2O3为催化剂合成糠酸酯类香料.通过对催化剂制备的正交试验,优选了催化剂的制备条件;通过正交试验优化了糠酸酯化的条件:以糠酸0.1mol为准,催化剂用量0.6g,酸醇摩尔比1∶3,反应时间4h,并以此条件合成了糠酸甲酯、乙酯、丁酯三种糠酸酯类香料.     

Copolyesters Containing Terephthalic and Bio‐Based Furanic Units by Melt‐Polycondensation

5,5′‐Isopropylidene‐bis(ethyl 2‐furoate), a monomer prepared from bio‐based ethyl 2‐furoate, was reacted with dimethyl terephthalate and ethan‐1,2‐diol (ED) by melt polycondensation in order to obtain copolyesters containing both terephthalate and furoate units. The conventional two‐step method involving (i) the formation of a hydroxyethyl‐terminated oligomer by reaction of starting diester mixture with excess ED and (ii) a polycondensation step with elimination of ED was used to obtain high molar mass copolyesters. Copolymers of various compositions were synthesized and characterized by ¹H NMR, DSC, and TGA. For all compositions, the degree of randomness, determined by ¹H NMR, was close to 1, reflecting a random distribution of terephthalic and furanic ester units in polymer chains. The resulting materials are amorphous polymers (T_g = 70–80 °C) with good thermal stability.