
1,8-Diazabicyclo (5.4.0)undec-7-ene - Wikipedia
1,8-Diazabicyclo[5.4.0]undec-7-ene, or more commonly DBU, is a chemical compound and belongs to the class of amidine compounds. It is used in organic synthesis as a catalyst , a complexing ligand , and a non-nucleophilic base .
Bordwell pKa Table - Organic Chemistry Data
2017年10月27日 · In short, the stronger the acid, the smaller the pKa value and strong acids have weak conjugate bases. pKa values describe the point where the acid is 50% dissociated (i.e. deprotonated). Below are tables that include determined pKa values for various acids as determined in water, DMSO and in the gas Phase.
DBU CAS#: 6674-22-2 - ChemicalBook
3 天之前 · 1,8-二氮杂双环 [5.4.0]十一碳-7-烯,简称DBU,是一种双杂环结构的脒,英文名为1,8-Diazabicyclo [5.4.0]undec-7-ene,常温下为无色或浅黄色液体,能溶于水和乙醇,丙酮等多种有机溶剂,一般要低于30℃储存。 1,8-二氮杂二环十一碳-7-烯简称DBU,一种多功能的碱性试剂或催化剂,易溶于水、乙醇,具有很强的碱性,在异构、酯化、缩合、消除等反应中得到广泛的应用,且反应的条件温和、副反应少,反应选择性专一、产物转化率高,在化药领域有广泛的应用。
天天使用的DBU,没想到会这样 - ChemicalBook
2021年2月22日 · 在有机合成中,DBU作为一个特殊的碱,具有很广泛的实用性和适用性,如果一个反应加TEA,DIPEA等有机碱不反应或者反应不好,我们会下意识的想要么换个碱试试,DBU这时候通常会是其中的一个选择。 我们印象中DBU是一个几乎可以随便拿来就用没有什么缺点的有机强碱,它没有亲核性,结构稳定,位阻大,催化效果好,对溶剂也没有什么特别的不兼容,所以在很多反应中都得到了应用,这些在一般情况下都是没有问题的,但是这些认识又是不全面的。 …
pKa_values_of_Strong_Bases_in_Water (pKa of DBU, TBD, MTBD, TMG, phosphazenes) Keywords Aqueous pKa values of DBU, TBD, MTBD, TMG and phosphazenes (e.g. t-BuP4, EtP2, t-BuP1, t-BuP1(pyrr), etc)
酰胺合成中常用有机碱的PKa - 有机方法 - 化学经纬
2022年8月18日 · DBU : DBU 是一种强碱(pKa=11.5),非亲核碱, 可作为添加剂通过形成酰化DBU中间体而促进酰胺缩合。然而,由于其较强的碱性,它可以引起外消旋化 。 2,6-Lutidine : 2,6-Lutidine (2,6-二甲基吡啶)是一种空间受阻、弱亲核、温和的碱,pKa为6.6,弱碱性有助于减 …
Non-nucleophilic base - Wikipedia
Non-nucleophilic bases of high strength are usually anions. For these species, the pK a s of the conjugate acids are around 35–40. Other strong non-nucleophilic bases are sodium hydride and potassium hydride. These compounds are dense, salt-like materials that are insoluble and operate by surface reactions.
Technical Information DBU・DBN -San Apro
pKa:12.5; Solubility of DBU DBU is soluble in almost all organic solvents used in everyday life, and can be reacted using any solvent. Soluble: Water, ethyl alcohol, benzene, acetone, ethyl acetate, ether, dioxane, 1, 4-butanediol, DMSO, liquid ammonia, polyether polyol Insoluble: Petroleum ether
1,8-Diazabicyclo[5.4.0]undec-7-ene | C9H16N2 - PubChem
Follow these links to do a live 2D search or do a live 3D search for this compound, sorted by annotation score. This section is deprecated (see here for details), but these live search links provide equivalent functionality to the table that was previously shown here. 586. View in PubChem Search.
技术信息 DBU® - San Apro
pKa:12.5; DBU的溶解性 DBU几乎可溶于日常生活中使用的所有有机溶剂, 并可与任何溶剂发生反应。 可溶于:水、乙醇、苯、丙酮、乙酸乙酯、 乙醚、二氧六环、1,4-丁二醇、二甲基亚砜、 液氨、聚醚多元醇 不溶于:石油醚