Month: April 2022

Safety of quinoliniumhydrogensulphate. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: quinoliniumhydrogensulphate, is researched, Molecular C9H9NO4S, CAS is 530-66-5, about Strategies for crystal engineering of polar solids. Author is Zaworotko, Mike; Subramanian, S.; Macgillivray, L. R..

Crystal engineering was invoked to design structural analogs of 2 prototypic SHG active solids, p-nitroaniline (pNA) and K dihydrogen phosphate (KDP). PNA exists as linear polar strands because of head-to-tail H bonding between adjacent mols. whereas KDP is a self-assembled H bonded diamond-type network that becomes polar when the H bonds align. The authors detail preparation and crystallog. characterization of 2 classes of multicomponent solid, organic cation H sulfates and co-crystals of the cubane cluster [M(CO)3(μ3-OH)]4, which structurally mimic pNA and KDP, resp. Several of the multi-component solids are polar and they represent a generic approach to designing new polar materials since 1 component can be changed without altering the basic architecture within the crystal.

There is still a lot of research devoted to this compound(SMILES：[O-]S(=O)(O)=O.C12=CC=C[NH+]=C1C=CC=C2)Safety of quinoliniumhydrogensulphate, and with the development of science, more effects of this compound(530-66-5) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The effect of electron-withdrawing groups on 15N and 13C chemical shifts: A density functional study on a series of pyrroles》. Authors are Mothana, B.; Ban, F.; Boyd, R. J.; Thompson, A.; Hadden, C. E..The article about the compound:Ethyl 3,5-Dimethyl-2-pyrrolecarboxylatecas:2199-44-2,SMILESS:O=C(C1=C(C)C=C(C)N1)OCC).HPLC of Formula: 2199-44-2. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

Electron-withdrawing groups (EWGs) on the nitrogen atom of pyrroles have significant effects on the properties of the pyrrole. It has been suggested that the exptl. 13C chem. shifts show a general increase in deshielding effect with the increase of N-EWGs strength [A. Thompson, S. Gao, G. Modzelewska, D.S. Hughes, B. Patrick, D. Dolphin, Organic Lett., 2, 3587 (2000)]. However, recently observed 15N chem. shifts of pyrroles do not correlate with the N-EWG strength. To elucidate the relationship between the electronic structures of pyrroles and their nitrogen and carbon chem. shifts, d. functional theory calculations were performed on pyrroles with various substituents. A correlation between the paramagnetic shift and the 15N chem. shift was observed for the pyrroles, indicating that the nitrogen chem. shift trend for the pyrroles arises entirely from variations of the paramagnetic shift contribution. However, a general correlation between the 15N chem. shifts and the EWG strength does not exist. Natural chem. shielding (NCS) anal. shows that the changes in the σ(N5-R)-π* transitions and changes in the sum of the σ(C1-N5)-π* and σ(C4-N5)-π* transitions account for the nitrogen chem. shift trend observed in the pyrroles.

There is still a lot of research devoted to this compound(SMILES：O=C(C1=C(C)C=C(C)N1)OCC)HPLC of Formula: 2199-44-2, and with the development of science, more effects of this compound(2199-44-2) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

Arranja, Claudia T.; Ramos Silva, Manuela; Matos Beja, Ana; Ferreira, Ana F. P. V.; Sobral, Abilio J. F. N. published an article about the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2,SMILESS:O=C(C1=C(C)C=C(C)N1)OCC ).Recommanded Product: 2199-44-2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:2199-44-2) through the article.

In the title compound, C9H13NO2, there are two independent mols. per asym. unit. The mols. are very similar and almost planar, with the ethoxycarbonyl group anti to the pyrrole N atom. The two independent mols. are joined into dimeric units by strong hydrogen bonds between NH groups and carbonyl O atoms. Crystallog. data are given.

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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis, characterization and photochromic properties of novel spirooxazines, published in 2013-05-31, which mentions a compound: 530-66-5, mainly applied to spiro indoline naphthoxazine preparation photochromism merocyanine, SDS of cas: 530-66-5.

A series of spirooxazine compounds were synthesized via condensation reaction of 1,3,3-trimethyl-2-methyleneindoline with 1-nitroso-2,7-naphthalenediols, followed by esterification with acyl chlorides. Absorption bands in the visible region were observed in UV spectra (λmax: 530-665 nm), which were red-shifted as the polarity of solvent increased. Furthermore, these absorption bands also red-shifted with the increase of the electron-donating ability of the 6′-heterocycle substituent, but were nearly unaffected by 9′-acyloxy. Thermal decoloration showed that the thermal relaxation progress of the photomerocyanine followed 1st order kinetics and the relaxation time was tuned in a broad range from 125-1886 s (at 20°) by changing electron-donating power on 6′-heterocycle and 9′-acyloxy.

There is still a lot of research devoted to this compound(SMILES：[O-]S(=O)(O)=O.C12=CC=C[NH+]=C1C=CC=C2)SDS of cas: 530-66-5, and with the development of science, more effects of this compound(530-66-5) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (R)-4-(tert-Butyl)-2-(5-(trifluoromethyl)pyridin-2-yl)-4,5-dihydrooxazole, is researched, Molecular C13H15F3N2O, CAS is 1428537-19-2, about 11-Step Total Synthesis of Teleocidins B-1-B-4, the main research direction is teleocidin B synthesis.Synthetic Route of C13H15F3N2O.

A unified and modular approach to the teleocidin B family of natural products is presented that proceeds in 11 steps and features an array of interesting strategies and methods. Indolactam V, the known biosynthetic precursor to this family, was accessed through electrochem. amination, Cu-mediated aziridine opening, and a remarkable base-induced macrolactamization. Guided by a desire to minimize concession steps, the tactical combination of C-H borylation and a Sigman-Heck transform enabled the convergent, stereocontrolled synthesis of the teleocidins.

There is still a lot of research devoted to this compound(SMILES：FC(C1=CN=C(C2=N[C@H](C(C)(C)C)CO2)C=C1)(F)F)Synthetic Route of C13H15F3N2O, and with the development of science, more effects of this compound(1428537-19-2) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ) is researched.Product Details of 2199-44-2.Antina, E. V.; Guseva, G. B.; Dudina, N. A.; V’yugin, A. I.; Semeikin, A. S. published the article 《Synthesis and spectral analysis of alkyl-substituted 3,3′-bis(dipyrrolylmethenes)》 about this compound( cas:2199-44-2 ) in Russian Journal of General Chemistry. Keywords: dipyrrolylmethene preparation fluorescence IR NMR; biline biladiene analog preparation mol structure property relationship; photosensitizer fluorescence photodynamic therapy dipyrrolylmethene preparation. Let’s learn more about this compound (cas:2199-44-2).

Four new alkyl-substituted 3,3′-bis(dipyrrolylmethene) dihydrobromide derivatives containing from 4-10 alkyl substituents were synthesized. In a highly alkylated ligand among these substances one of the hydrogen atoms of the 3,3′-methylene spacer was substituted with a Ph group. The compounds obtained were studied by IR, 1H NMR, electron absorption and fluorescent spectroscopy. The increased alkylation degree of pyrroles and the introduction of an aryl substituent in the 3,3′-spacer causes a significant high-frequency shift of the N-H stretching vibrations in the IR spectra, an upfield shift of the NH-proton signals in NMR spectra, a decrease in the auxochromic effects of protons on the aromatic system of chromophore in the composition of salts. The red shift of maximum of the strong band in electron absorption spectra and the emission spectra of compounds in DMF, DMSO, C5H5N, C6H6, and CHCl3 was established. The salts obtained are stable in benzene and chloroform, while in electron-donor solvents the irreversible processes of solvolytic dissociation of salts to free organic base and HBr take place.

There is still a lot of research devoted to this compound(SMILES：O=C(C1=C(C)C=C(C)N1)OCC)Product Details of 2199-44-2, and with the development of science, more effects of this compound(2199-44-2) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

Application In Synthesis of Bromoferrocene. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about Crystal and molecular structure of the complex boron triferrocenyl-pyridine. Author is Soriano-Garcia, Manuel; Toscano, Alfredo; Lopez, Tessy; Campero-Celis, Antonio.

X-ray study of the title tris(ferrocenyl)boron pyridine complex confirms that in the solid state its structure is similar to that inferred from chem. and spectroscopic evidence. The B atom is coordinated by 3 ferrocenyl groups and a pyridine ring in a distorted tetrahedral array. The mol. has a nearly 3-fold axis normal to the plane defined by the ferrocenyl groups. The B-N distance of 1.656 (5) Å is larger than that obtained for other compounds studied. The pyridine and cyclopentadienyl rings are planar. The H atoms of the cyclopentaidenyl rings are displaced significantly toward their corresponding Fe atom. The mols. in the crystal are packed at normal van der Waals distances. No unusually short intermol. contacts are noted.

There is still a lot of research devoted to this compound(SMILES：Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25)Application In Synthesis of Bromoferrocene, and with the development of science, more effects of this compound(1273-73-0) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Alcoholytic, phenolytic and hydrolytic cleavage of organic compounds by catalysts. II》. Authors are Houben, J.; Fischer, Walter.The article about the compound:Ethyl 3,5-Dimethyl-2-pyrrolecarboxylatecas:2199-44-2,SMILESS:O=C(C1=C(C)C=C(C)N1)OCC).Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

cf. C. A. 25, 3311. As shown recently, trihalomethyl ketones are not only converted stoichiometrically into alkali carboxylates and CHCl3 by aqueous alkali (Reaction 1) but also undergo another, purely catalytic reaction; even in the cold they react with alcs. according to the equation RCOCCl3 + R’OH = RCO2R’ + CHCl3 (Reaction 2). It was thought that an alcoholate was indispensable as the catalyst and that water must be excluded as completely as possible to prevent reaction 1. It was soon found, however, that this conception was erroneous and that the role of catalyst can be played very successfully by certain organic salts, such as alkali acetates, formates, benzoates, etc., and purely inorganic carbonates, bicarbonates, sulfites, nitrites, and reaction 2 can be smoothly effected in systems containing considerable water (10%). Thus, while BzCCl3 is not changed in the least by heating 8 hrs. at 170° in a sealed tube, addition of a droplet of dilute aqueous KOH to its MeOH solution suffices to decompose it at once, with evolution of heat, into BzOMe and CHCl3, Presumably there is first formed a little BzOK which quickly exerts its powerful catalytic effect. Mg(OH)2, shaken a long time in aqueous suspension with BzCCl3, decomposes it almost completely into (BzO)2Mg and CHCl3 but in aqueous MeOH gives 92% BzOMe. Thus, in addition to the possibility of neutralizing aqueous or aqueous alc. alkali by completely neutral compounds such as AcCCl3, BzCCl3, etc., a reaction which may prove useful for preparative and anal. purposes, there is the further possibility of decomposing, also in completely neutral solution, the excess of halogen ketone by subsequent addition of alc. It may thus be possible, by addition of minute amounts of perfectly neutral substances, to produce large quantities of nascent CHCl3, CHBr3, HCN (nitriles also undergo the reaction). The milder conditions (entire absence of strong alkalies) under which reaction 2 can now be effected has made it possible to extend the reaction to other substances which previously had either not reacted at all (phenols) or only with difficulty (menthol), for long and high heating may be employed, if necessary, and the reaction can be carried out in alk., neutral or acid solution; thus, KOAc is effective in AcOH and HCO2K reacts excellently in HCO2H. Hydrolysis of the trihalomethyl ketones can likewise be effected by aqueous solutions of catalytically small quantities of certain salts or, what amounts to the same thing, of alkalies, for these are rapidly converted by the ketone into the catalytic salt. Thus, BzCCl3 is smoothly decomposed into BzOH and CHCl3 by boiling several hrs. with water to which has been added a little KOAc; with water alone there is no hydrolysis even after 7 hrs. at 170°. Reaction 1 is really based on catalytic hydrolysis, the much slower velocity of which, as compared with the catalytic esterification (reaction 2) seems to be due to the slight solubility of the hydrolysis products; its acceleration by a stoichiometric amount of alkali (reaction 1) may in great part be due to the opportunity thus afforded to the BzOH to dissolve; in aqueous Me2CO containing a trace of KOAc, 96% BzOH was obtained from BzCCl3 after refluxing 4 hrs. The ready splitting off of a C atom from the trihalomethyl ketones does not occur with the dihalogen compounds, as far as can be judged from experiments with BzCHCl2, which yields PhCH(OH)CO2H. The following % yields of ester were obtained from the appropriate trichloromethyl ketone and alc. in the presence of a little Na: m-O2NC6H4CO2Me 62, m-H2NC6H4CO2Me 90, Et 2,4-dimethylpyrrole-5-carboxylate 93, Et 2-methylindole-3-carboxylate 85, octyl acetate 70, cetyl benzoate 45. Yield of phenol esters with KOAc as catalyst (reaction temperature in parentheses): PhOBz 80 (120°), p-MeC6H4OBz 90 (230°), o-MeC6H4CO2Bz 80 (230°), menthyl benzoate 58 (150°) (the yield previously obtained with Na was 37%). Below are given, resp., the length of reaction (in days unless otherwise stated) and the % yield of benzoate obtained at 20° from BzCCl3 with various alcs. and 0.5-1 equivalent of different catalysts. MeOH: HCO2K 2, 74; HCO2K + HCO2H 3, 85; KOAc 2, 92; KOAc + AcOH 3, 90; KOBz 1, 81; KNO3 3, 91; Mg(OH)2 1, 92. PrOH: Mg(OH)2 2, 79. iso-BuOH: KOAc 4, 90. Hexyl alc.: KOAc 4, 93. Allyl alc.: KOAc 2, 93. Menthol: KOAc 6 hrs. at 150°, 58. PhOH: 4 hrs. at 120°, 80. o-Cresol: KOAc, 4 hrs. at 130°, 80. p-Cresol: KOAc 4 hrs. at 130°, 90. Although very small amounts of the catalysts are distinctly effective, 0.5-1 equivalent was used to shorten the reaction time as much as possible. The lengths of reaction given were in many cases perhaps unnecessarily long. KHCO3, Na2CO3, Na2SO3 and AcONH4 are also effective, but KNO3, anhydrous or hydrated NH4Cl, K bioxalate, HCl.H2O, H2SO4.H2O and HCl are not effective even after 1 day at 70°. BzCCl3 (2.23 g.) and 0.5 g. KOAc, allowed to stand 1 day in 5 cc. MeOH containing 10% water, gave 81% BzOMe; 2.23 g. of the ketone and 0.5 g. KOAc shaken 25 hrs. in 2.4 cc. MeOH containing 50% water gave 22% ester and 70% unchanged ketone. When BzCHCl2 was allowed to stand with 0.1 equivalent Na in MeOH the alkalinity soon greatly diminished and Cl ions but no CH2Cl2 or BzOMe were formed; with 2 equivalents Na, NaCl was deposited and after standing overnight there was obtained 61% phenylglyoxal di-Me acetal, b13 110-4°.

There is still a lot of research devoted to this compound(SMILES：O=C(C1=C(C)C=C(C)N1)OCC)Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, and with the development of science, more effects of this compound(2199-44-2) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

Synthetic Route of C10H11NO2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 1,2,3,4-Tetrahydroquinoline-3-carboxylic acid, is researched, Molecular C10H11NO2, CAS is 114527-53-6, about Reduction of quinolinecarboxylic acids by Raney nickel. Author is Gracheva, I. N.; Tochilkin, A. I..

The heterocyclic nucleus of quinolinecarboxylic acids was reduced by Raney Ni in alkali media giving 1,2,3,4-tetrahydroquinoline-2-, -3-, -4-, -5-, -6-, and -8-carboxylic acids. Their Et esters were also prepared

There is still a lot of research devoted to this compound(SMILES：OC(=O)C1CNC2=CC=CC=C2C1)Synthetic Route of C10H11NO2, and with the development of science, more effects of this compound(114527-53-6) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com

Category: thiazolidine. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about A new synthesis of diferrocenyl ketones.

Diferrocenyl ketone and [1.1]ferrocenophane-1,12-dione (I) were obtained in 86% and 13% yields, resp., via a simple route analogous to the Barbier synthesis involving N,N-disubstituted carbamyl chlorides and the appropriate bromoferrocene derivatives

There is still a lot of research devoted to this compound(SMILES：Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25)Category: thiazolidine, and with the development of science, more effects of this compound(1273-73-0) can be discovered.

Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com