Month: April 2022

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of heterocycles. XL. 3-(2-Acetoxybenzoyl)-4-oxo1,2-benzoxazine》. Authors are Ziegler, E.; Noelken, E..The article about the compound:2-Chloroethyl acetatecas:542-58-5,SMILESS:CC(OCCCl)=O).Computed Properties of C4H7ClO2. Through the article, more information about this compound (cas:542-58-5) is conveyed.

cf. CA 57, 9850b. The title compound (I), and AcNHPh were formed when o-OHC6H4COCH:NNHPh (II) was refluxed with Ac2O. The 2,4-dichlorophenylhydrazone, m. 164°, underwent analogous cleavage of the N-NH bond to give I and 2,4-dichloroacetanilide. Thus, 0.8 g. II heated for 2 hrs. with 8 ml. Ac2O yielded 58% I, m. 206° (C6H6).

From this literature《Synthesis of heterocycles. XL. 3-(2-Acetoxybenzoyl)-4-oxo1,2-benzoxazine》,we know some information about this compound(542-58-5)Computed Properties of C4H7ClO2, but this is not all information, there are many literatures related to this compound(542-58-5).

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The free energies of hydrolysis of some esters and thiol esters of acetic acid》. Authors are Jencks, William P.; Gilchrist, Mary.The article about the compound:2-Chloroethyl acetatecas:542-58-5,SMILESS:CC(OCCCl)=O).Computed Properties of C4H7ClO2. Through the article, more information about this compound (cas:542-58-5) is conveyed.

The free energies of hydrolysis of EtOAc, methoxyethyl acetate, chloroethyl acetate, acetylcholine, and trifluoroethyl acetate to the free acid in aqueous solution at 25° (based on a water activity of 1.0) are -1660, -2180, -2840, -2940, and -4970 cal./mole, resp. The equilibrium constants for Ac transfer from acetylcholine to the thiol groups of N-acetyl-β-mercaptoethylamine and mercaptoacetate are 0.076 and 0.132, resp. The free energies of hydrolysis (to free HOAc) of N,S-diacetyl-β-mercaptoethylamine and S-acetylmercaptoacetate are, therefore, -4460 and -4140 cal./mole, resp., in good agreement with a previously reported value for a thiol ester of HOAc.

There is still a lot of research devoted to this compound(SMILES：CC(OCCCl)=O)Computed Properties of C4H7ClO2, and with the development of science, more effects of this compound(542-58-5) can be discovered.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 2-Ethylpyrazine, is researched, Molecular C6H8N2, CAS is 13925-00-3, about Prediction of coffee aroma from single roasted coffee beans by hyperspectral imaging.Electric Literature of C6H8N2.

Coffee aroma is critical for consumer liking and enables price differentiation of coffee. This study applied hyperspectral imaging (1000-2500 nm) to predict volatile compounds in single roasted coffee beans, as measured by Solid Phase Micro Extraction-Gas Chromatog.-Mass Spectrometry and Gas Chromatog.-Olfactometry. Partial least square (PLS) regression models were built for individual volatile compounds and chem. classes. Selected key aroma compounds were predicted well enough to allow rapid screening (R2 greater than 0.7, Ratio to Performance Deviation (RPD) greater than 1.5), and improved predictions were achieved for classes of compounds – e.g. aldehydes and pyrazines (R2 ∼ 0.8, RPD ∼ 1.9). To demonstrate the approach, beans were successfully segregated by HSI into prototype batches with different levels of pyrazines (smoky) or aldehydes (sweet). This is industrially relevant as it will provide new rapid tools for quality evaluation, opportunities to understand and minimise heterogeneity during production and roasting and ultimately provide the tools to define and achieve new coffee flavor profiles.

There is still a lot of research devoted to this compound(SMILES：CCC1=NC=CN=C1)Electric Literature of C6H8N2, and with the development of science, more effects of this compound(13925-00-3) can be discovered.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare