The present invention relates to novel blocked, elimination-free polyurethane (PUR) crosslinking agents, to a process for their preparation and to their use as starting components for the production of polyurethane plastics, especially as crosslinking agents for thermally crosslinkable powder coatings.
Polycyclic Ketone Monooxygenase from the Thermophilic Fungus <i>Thermothelomyces thermophila</i>: A Structurally Distinct Biocatalyst for Bulky Substrates
作者:Maximilian J. L. J. Fürst、Simone Savino、Hanna M. Dudek、J. Rúben Gómez Castellanos、Cora Gutiérrez de Souza、Stefano Rovida、Marco W. Fraaije、Andrea Mattevi
DOI:10.1021/jacs.6b12246
日期:2017.1.18
thermophila, determined its three-dimensional structure, and demonstrated its use as a promising biocatalyst. This fungal enzyme displays excellent enantioselectivity, acts on various ketones, and is particularly active on polycyclic molecules. Most notably we observed that the enzyme can perform oxidations on both the A and D ring when converting steroids. These functional properties can be linked to unique
区域选择性和立体选择性 Baeyer-Villiger 氧化很难通过经典的化学方法实现,特别是当要转化大的官能化分子时。使用含黄素的 Baeyer-Villiger 单加氧酶 (BVMO) 进行生物催化是解决这些挑战的成熟工具,但已知的 BVMO 在稳定性或底物选择性方面存在缺陷。我们对来自嗜热真菌嗜热嗜热菌的新型 BVMO 进行了表征,确定了其三维结构,并证明了其作为一种有前途的生物催化剂的用途。这种真菌酶表现出优异的对映选择性,作用于各种酮,对多环分子特别活跃。最值得注意的是,我们观察到该酶在转化类固醇时可以对 A 环和 D 环进行氧化。
Toward Upscaled Biocatalytic Preparation of Lactone Building Blocks for Polymer Applications
作者:Marie A. F. Delgove、Matthew T. Elford、Katrien V. Bernaerts、Stefaan M. A. De Wildeman
DOI:10.1021/acs.oprd.8b00079
日期:2018.7.20
Although Baeyer-Villiger monooxygenases (BVMOs) have gained attention in recent years, there are few cases of their upscaled application for lactone synthesis. A thermostable cyclohexanone monooxygenase from Thermocrispum municipale (TmCHMO) was applied to the oxidation of 3,3,5-trimethylcyclohexanone using a glucose dehydrogenase (GDH) for cofactor regeneration. The reaction progress was improved by optimizing
尽管近年来拜耳-维利格(Baeyer-Villiger)单加氧酶(BVMOs)引起了人们的注意,但很少有将其大规模用于内酯合成的情况。使用葡萄糖脱氢酶(GDH),将来自市政热Thermo(TmCHMO)的热稳定环己酮单加氧酶用于3,3,5-三甲基环己酮的氧化,以进行辅因子再生。通过优化生物催化剂的负载量以及研究氧限制条件,可以改善反应进程。通过连续底物进料(CSF)将底物浓度保持在抑制水平以下,从而提高了产品浓度和生产率。使用甲苯或乙酸正丁酯作为不混溶的有机溶剂,针对两种双相反应评估了该底物进料策略。通过应用CSF策略在两种区域异构内酯的克级合成过程中,获得了38 g L-1的产物浓度和1.35 g L-1 h-1的时空产率。这些改进有助于BVMO在聚合物应用的支链结构单元的合成中的大规模应用。
Enzymatic Synthesis of Trimethyl-ε-caprolactone: Process Intensification and Demonstration on a 100 L Scale
3,5-trimethyl-cyclohexanone to trimethyl-ε-caprolactones (CHLs) were studied to demonstrate this technology on a 100 L pilot plant scale. The reaction was catalyzed by a cyclohexanone monooxygenase from Thermocrispum municipale that utilizes the costly redox cofactor nicotinamide adenine dinucleotide phosphate (reduced form), which was regenerated by a glucose dehydrogenase (GDH). As a first stage
研究了3,3,5-三甲基环己酮的Baeyer-Villiger氧化为三甲基ε-己内酯(CHLs)的优化和规模放大,以在100 L的中试规模上证明了该技术。该反应由得自Thermocrispum Municipale的环己酮单加氧酶催化它利用了昂贵的氧化还原辅因子烟酰胺腺嘌呤二核苷酸磷酸酯(还原形式),该磷酸酯是通过葡萄糖脱氢酶(GDH)再生的。作为第一步,测试了不同的环己酮单加氧酶制剂:无细胞提取物,全细胞,发酵液和超声发酵液。使用肉汤可获得最高的收率(63%),并且所需的生物催化剂制备工作最少。评估了两种商品化的葡萄糖脱氢酶(GDH-105和GDH-01),从而获得了相似的性能。优化了底物的加料速率和生物催化剂的载量。在30 mL范围内,当30 mM h –1时,发现了最佳条件施用剂量,10%(v / v)的环己酮单加氧酶肉汤和0.05%(v / v)的葡萄糖脱氢酶(GDH-01)液体酶
HIGH-FUNCTIONAL POLYISOCYANATES CONTAINING ALLOPHANATE AND SILANE GROUPS
申请人:Laas Hans-Josef
公开号:US20110082273A1
公开(公告)日:2011-04-07
The invention relates to high-functional polyisocyanates containing allophanate and silane groups, a method for their production and their use as a starting component in the production of polyurethane plastics, in particular as a crosslinker component in polyurethane paints and coatings.