Evaporation reaction

Cyclization of 4-[(2-pyridylamino)methylene]-2-methoxythiazolin-5(4//)-one 313 (R = Me) in the presence of NaOMe gave 3-(methoxythiocarbo-nylamino)-4//-pyrido[l,2-n]-pyrimidin-4-one 314. When the reaction mixtures were subsequently treated with Mel, and the evaporated reaction mixtures with cone. HCl in EtOH, 3-amino-4//-pyrido[l,2-n]pyrimidin-4-ones 315 were obtained (94JHC125). 

Chloro-2,3,4,4fl,5,6-hexahydro-l //-pyrazino[l, 2-fl]quinolin-2-one (407) was prepared when 6-chloro-2-[A -(2-bromoacetyl),-A -(rerf-butoxycarbonyl) aminomethyl]-l,2,3,4-tetrahydroquinoline (406) was first treated with TFA, then the evaporated reaction mixture was heated in DMF in the presence of powdered K2CO3 (96USP5576319). 

Oxidation of tetrathioianes (8) with DMDO gave mixtures of dithiirane 1-oxides (10) and thioketones (11) (Scheme 5). The existence of the intermediate tetrathioiane 1-oxides (9) was verified by NMR of the cooled and evaporated reaction mixture. ... 

When the 3-thiourea derivative (59) was heated in boiling ethanol for 3 h, and then the evaporated reaction mixture was treated with 10% NaOH solution at 100°C for 20 min, anhydro 2-methyl-3-mercapto-4-hydroxy-5,6,7,8-tetrahydro[l,2-6]pyridazinium hydroxide (61) was obtained (71CPB159). The mercapto group was alkylated with benzyl bromide and was treated with HgCla in boiling ethanol to yield the 3-chloromercurithio derivative. Anhydro 3,4-dihydroxy-2-methyl-5,6,7,8-tetrahydropyrido[l,2-f ]pyridazinium hydroxide (62) was O-acylated with acetic anhydride, but the structure of the product was not elucidated (71CPB159). 

When MgO has evaporated, Reaction 21-1 no longer occurs and A1203 decomposes and evaporates. A matrix modifier that raises the boiling temperature of analyte allows a higher charring temperature to be used to remove matrix without losing analyte. 

A side-chain NH-Boc group of perhydropyrido[2,l-c][l,4]oxazin-3-one 215 was changed for a NH-dansyl group by treatment first in a 30 1 mixture of MeOH and AcCl at room temperature for 20 h, then the residue of the evaporated reaction mixture was dissolved in DMF and was reacted with dansyl chloride in the presence of NEt3 at room temperature for 4 h (08BMC10216). 

The diastereomeric mixture of l,3,4,6,7,lll>hexahydro-2/T-pyrazino LI, 2-bj isoqu inoline-1,4-d iones 497 was prepared in four-component Ugi/ Pictet-Spengler two-step procedure when aldehydes/ketones, a-ketoa-cids, 2-(3,4-dimethoxyphenyl)ethyl isocyanide and primary amines were stirred in MeOH, and then the evaporated reaction mixture in TFA (07SL500). 

This facility is composed of two cyclotrons, a K=90 compact one and a K=160 separated sector one which is operating since 1982. An ECR ion source is now commonly used for the production of C,N,0 and Ne beams up to 40 MeV/u energy. The layout of the beam lines, as shown in fig. 1, allows to use also the first cyclotron alone when high intensity, moderate energy beams are needed. This is a common mode of operation to carry out spectroscopic studies by means of fusion-evaporation reactions. 

Perhydropyrido[2,l-c][l,4]thiazine was prepared when 2-[(2-hydroxy-ethylthio)methyl]piperidine was treated with HBr in AcOH, and the evaporated reaction mixture was treated with NaOEt in EtOH [57N559 ... 

There was also great uncertainty of the production yields for SHEs. Closely related to the fission probability of SHEs in the ground-state, the survival of the compound nuclei formed after complete fusion was difficult to predict. Even the best choice of the reaction mechanism, fusion or transfer of nucleons, was critically debated. However, as soon as experiments could be performed without technical limitations, it turned out that the most successful methods for the laboratory synthesis of heavy elements are fusion-evaporation reactions using heavy-element targets, recoil-separation techniques, and the identification of the nuclei by generic ties to known daughter decays after implantation into position-sensitive detectors [13-15],... 

The reason for this difference is as follows. For most REEs, such as lanthanum, the evaporation reaction is H2 + LaaOs — 2LaO - - H2O for cerium, it is H2O - - Ct20j, — 2Ce02 + H2. Thus, as hydrogen pressure is increased, lanthanum and most other REEs become more volatile and cerium becomes more refractory under very low pressures (as in vacuum experiments), cerium is significantly more volatile than the other REEs (Davis et al., 1982). 

Table V-46 The enthalpy of the evaporation reactions at 298.15 K and the standard enthalpy of formation of Ga2Se(g).

The sublimation thermodynamics of EuSe was studied in the temperature range 1808 to 2131 K by Hariharan and Eick [74HAR/EIC] using mass spectrometry and Knudsen cells. The evaporation reaction is EuSe(cr) Eu(g) + Se(g). The second law value... 

Zone 0 usually only comprises the interior of containers or apparatuses (evaporators, reaction vessels etc.) if the conditions for Zone 0 are fulfilled. 

The fusion-evaporation reaction is a two-step process. The production cross section is determined by the fusion and the de-excitation of the intermediate (compound) nucleus ... 

The variability in energy savings and capital costs still depends on the existing evaporator conditions. For existing multi-effect units in which the total amount of first-effect vapor is now used in the second effect, the choice and location of the steam-jet thermocompressor are more complicated because the heat balances and heat-transfer rates are affected for each evaporator reaction. The economics may still be favorable to justify the technical evaluation and modification. Since the limitations of steam-jet thermocompressors are a compression ratio below 1.8 and new heat-transfer rates, the first effect normally becomes the best location. 

Fig. 2 Cold fusion cross sections for the In-evaporation reaction charmel to produce transactinide nuclides fiom targets of or An exponential fit to the data is included. Simple extrapolation would indicate that cross sections for synthesis of superheavy isotopes with Z > 113 are prohibitively low...

Decompose the combustion process of a liquid fuel spray into individual steps (evaporation, reaction, heat transfer, mass transfer) that, taken together, might yield a satisfactory model for the process. Describe in words only. 

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