Ethylamine, molecular structure

Vinylamine (R1 = R2 = R3 = H) is the simplest primary enamine. It was prepared by gas-phase pyrolysis of ethylamine and characterized by its microwave spectrum which led to a crude determination of its molecular geometry56. The interesting question refers to the extent of planarity or tetrahedral geometry of the amino group and this is discussed in the section on calculations of molecular structures. 

The temperature effect on solubility may have different characters depending on the molecular structure of solute. For systems of liquid-amorphous or liquid-liquid polymers, the temperature raise can cause improvement of compatibility. Such systems are considered to have the upper critical solution temperature (UCST). If the system of two liquids becomes compatible at at r ratio at the temperature below the defined critical point, the system is considered to have the lower critical solution temperature (LCST). Examples of a system with UCST are mixtures of methyl ethyl ketone-water (150°C) and phenol-water (65.8°C). An example of a system with LCST is the mixture of water-triethylamine (18°C). There are systems with both critical points, for example, nicotine-water and glyc-erol-benzyl-ethylamine. 

The molecular modelling approach, taking into account the pyruvate—cinchona alkaloid interaction and the steric constraints imposed by the adsorption on the platinum surface, leads to a reasonable explanation for the enantio-differentiation of this system. Although the prediction of the complex formed between the methyl pyruvate and the cinchona modifiers have been made for an ideal case (solvent effects and a quantum description of the interaction with the platinum surface atoms were not considered), this approach proved to be very helpful in the search of new modifiers. The search strategy, which included a systematic reduction of the cinchona alkaloid structure to the essential functional parts and validation of the steric constraints imposed to the interaction complex between modifier and methyl pyruvate by means of molecular modelling, indicated that simple chiral aminoalcohols should be promising substitutes for cinchona alkaloid modifiers. Using the Sharpless symmetric dihydroxylation as a key step, a series of enantiomerically pure 2-hydroxy-2-aryl-ethylamines... 

LSD gets its potency from the combination of units within its molecular makeup. Both the indole ethylamine and the phenyl-ethylamine units reside within its structure. 

Heating of 5-ethoxy-1,2,3,4-thiatriazolium tetrafluoroborate (161) with malononitrile and tri-ethylamine in acetonitrile solution gave crystalline l,2,3,4-thiatriazolium-5-dicyanomethylide (22) (Equation (13)) <79JCS(P1)744>. The structure is supported by spectral properties. The IR spectra show C=C (1500 cm ) and CN (2200 cm ) stretching vibrations and the mass spectra shows the correct molecular ions. A dipole moment of 8.8 D (R = Ph) was measured in benzene in good agreement with the proposed structure (22). 

Ethylamine is an example of an important class of organic compounds. The molecular formula of ethylamine is CH3CH2NH2. Draw its Lewis structure. 

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