CHAP 11: ORGANIC CHEMISTRY in VS .NET

Creation DataMatrix in VS .NET CHAP 11: ORGANIC CHEMISTRY

CHAP 11: ORGANIC CHEMISTRY
Encoding Data Matrix In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
Recognizing Data Matrix ECC200 In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
Organic Phase
Draw Bar Code In .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
Bar Code Scanner In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
Organic Phase
Print Data Matrix In C#.NET
Using Barcode creator for .NET Control to generate, create Data Matrix ECC200 image in .NET applications.
Make ECC200 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create Data Matrix ECC200 image in ASP.NET applications.
SO3H naphthalene naphthalenesulfonic acid naphthalene wash with aqueous hydrochloric acid solution Aqueous Phase Organic Phase
Data Matrix ECC200 Generator In VB.NET
Using Barcode generator for .NET framework Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Encode USS Code 39 In .NET Framework
Using Barcode generation for .NET framework Control to generate, create Code 3/9 image in .NET applications.
N quinoline
Creating GS1 - 12 In VS .NET
Using Barcode creator for VS .NET Control to generate, create UPC A image in .NET framework applications.
Encoding ANSI/AIM Code 128 In VS .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code 128 Code Set A image in VS .NET applications.
wash with aqueous sodium bicarbonate solution Organic Phase
Bar Code Drawer In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create barcode image in .NET framework applications.
ANSI/AIM Code 93 Drawer In .NET
Using Barcode maker for VS .NET Control to generate, create USS 93 image in .NET applications.
Aqueous Phase
USS Code 39 Encoder In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create Code 3/9 image in .NET framework applications.
UPC-A Printer In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create GTIN - 12 image in VS .NET applications.
FIGURE 1132:
UPC Symbol Recognizer In C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
UPCA Maker In None
Using Barcode generation for Software Control to generate, create UPC Code image in Software applications.
Two pH-controlled extractions
Creating UPC-A Supplement 5 In Visual C#
Using Barcode generation for .NET Control to generate, create UPC-A Supplement 2 image in VS .NET applications.
Reading UPC A In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
PART V: REVIEWING PCAT CHEMISTRY
Code 39 Maker In Objective-C
Using Barcode generator for iPad Control to generate, create Code 39 image in iPad applications.
Barcode Creator In Objective-C
Using Barcode generator for iPhone Control to generate, create barcode image in iPhone applications.
(Figure 1132), taking advantage of the basic nature of the heterocyclic nitrogen (pKa 95) If it is necessary to isolate the quinoline, it is neutralized with bicarbonate and extracted back into an organic solvent
CHROMATOGRAPHY
Chromatography represents the most versatile separation technique readily available to the organic chemist Conceptually, the technique is very simple there are two components: a stationary phase (usually silica or cellulose) and a mobile phase (usually a solvent system) Any two compounds usually have different partitioning characteristics between the stationary and mobile phases Since the mobile phase is moving (thus the name), then the more time a compound spends in that phase, the farther it will travel Chromatographic techniques fall into one of two categories: analytical and preparative Analytical techniques are used to follow the course of reactions and determine purity of products These methods include gas chromatography (GC), high-performance liquid chromatography (HPLC), and thin-layer chromatography (TLC) Sample sizes for these procedures are usually quite small, from microgram to milligram quantities In some cases, the chromatographic method is coupled to another analytical instrument, such as a mass spectrometer or NMR spectrometer, so that the components that elute can be easily identi ed Preparative methods are used to purify larger quantities of a compound for further use By far the most common chromatographic technique used in the laboratory is TLC Figure 1133 depicts a typical TLC plate developed in a 1:1 mixture of ethyl acetate and hexane, which exhibits two well-separated components The spots can be characterized
50% EtOAc in hexane
solvent front
Rf2 = b/c (069)
Rf1 = a/c (029)
baseline (origin)
FIGURE 1133:
A typical thin-layer chromatography (TLC) plate
by their Rf value, which is de ned as the distance traveled from the origin divided by the distance traveled by the mobile phase Generally speaking, the slower-moving component (Rf 029) is either larger, more polar, or both If we wanted a larger Rf value, we could boost the solvent polarity by increasing the proportion of ethyl acetate in the mobile phase Conversely, more hexane would result in lower-running spots
CHAP 11: ORGANIC CHEMISTRY
DISTILLATION AND SUBLIMATION
If chromatography is the most versatile separation method in the laboratory, it might be argued that distillation is the most common This technique is used very frequently for purifying solvents and reagents before use When volatile components are being removed from nonvolatile impurities, the method of simple distillation is employed (Figure 1134) In this familiar protocol, a liquid is heated to the boil, forcing vapor into a water-cooled condensor, where it is converted back to liquid and is conveyed by gravity to a receiving ask
FIGURE 1134:
Simple distillation
When separating two liquids with similar boiling points or substances that tend to form azeotropes fractional distillation is used In this method, a connector with large surface area (such as a Vigreux column) is inserted between the still pot and the distillation head The purpose of this intervening portion is to provide greater surface area upon which the vapor can condense and revolatilize, leading to greater ef ciency of separation In more sophisticated apparatus, the Vigreux column and condensor are
PART V: REVIEWING PCAT CHEMISTRY
separated by an automated valve which opens intermittently, thus precisely controlling the rate of distillation For compounds with limited volatility, the technique of bulb-to-bulb distillation (Figure 1135) is sometimes successful In this distillation, the liquid never truly boils that is to say, the vapor pressure of the compound does not reach the local pressure of the environment Instead, the sample is placed in a ask (or bulb) and subjected to high vacuum and heat, which sets up a vapor pressure adequate to equilibrate through a passage to another bulb, which is cooled with air, water, or dry ice
FIGURE 1135:
Copyright © OnBarcode.com . All rights reserved.