A case is described where intrusion of a primary incisor resulting in apical fenestration may have occurred secondary to occlusal forces. The effects on the permanent dentition and possible aetiological factors are discussed.
Synthetic methods. 25. Titanium tetrachloride-catalyzed addition of hydrazoic acid to aldehydes and ketones. Thermolysis and photolysis of .alpha.-azido ethers
New greenfluorescentprotein (GFP) chromophoreanalogues, namely 4-(diarylmethylene)imidazolinones (DAINs), were readily synthesized under weakly acidic conditions using a novel condensation reaction between methyl imidate (or thioimidate) and ethyl N-(diarylmethylene)glycinate. DAINs showed notable fluorescence properties. Although they were nearly non-fluorescent in the solution, visible emissions
Ag
<sup>I</sup>
‐Catalyzed Reaction of Enol Diazoacetates and Imino Ethers: Synthesis of Highly Functionalized Pyrroles
作者:Kuiyong Dong、Ahmad Humeidi、Wendell Griffith、Hadi Arman、Xinfang Xu、Michael P. Doyle
DOI:10.1002/anie.202101641
日期:2021.6.7
AgI-catalyzed efficient method for the coupling of imino ethers and enol diazoacetates through a [3+2]-cycloaddition/C−O bond cleavage/[1,5]-proton transfer cascade process is reported. The general class of imino ethers that includes oxazolines, benzoxazoles and benzimidates are applicable substrates for these reactions that provide direct access to fully substituted pyrroles with uniformly high chemo- and
报道了一种前所未有的 Ag I催化有效方法,用于通过 [3+2]-环加成/C-O 键裂解/[1,5]-质子转移级联过程偶联亚氨基醚和烯醇重氮乙酸酯。包括恶唑啉、苯并恶唑和苯甲亚胺酯在内的一般亚氨基醚类是这些反应的适用底物,可直接获得具有均匀高化学和区域选择性的完全取代的吡咯。吡咯 2-、5- 和 N-位取代的高度可变性表征了这种方法,该方法也提供了通过对所得 N-官能吡咯的轻松修饰来进一步实现吡咯多样化的切入点。
Viscosity-Induced Emission of 5-(Diarylmethylene)imidazolone with Extended Conjugation <i>via</i> Attachment of <i>N</i>-Methylpyrrole at the 2-Position
We have developed a series of 2-monoaryl-5-diarylmethylene analogs of the green fluorescent protein chromophore to study their viscosity-induced emission (VIE) properties. The analogs were synthesized by a condensation with methyl imidate and N-(diarylmethylene)glycinate. Among the analogs, the N-methylpyrrol-2-yl-substituted analog 1h induced the most remarkable VIE behavior in triglyceride and lipid
我们开发了一系列绿色荧光蛋白发色团的 2-单芳基-5-二芳基亚甲基类似物,以研究它们的粘度诱导发射 (VIE) 特性。通过与亚氨酸甲酯和N- (二芳基亚甲基)甘氨酸酯缩合合成类似物。在这些类似物中, N-甲基吡咯-2-基取代的类似物1h在甘油三酯和脂质双层中诱导了最显着的 VIE 行为,这可能是由于吡咯环的高 π 电子丰富特性。咪唑啉酮类似物中的吡咯取代基有望成为引入 VIE 行为的通用模板。 全尺寸图像
Nitrilium salts. New method for the synthesis of secondary amines
作者:Richard F. Borch
DOI:10.1021/jo01255a031
日期:1969.3
Lander, Journal of the Chemical Society, 1903, vol. 83, p. 327