By oxidation of selenoacetic acid, CH3C(O)SeH, we have prepared the hitherto unknown diacetyl diselenide, [CH3C(O)Se]2. Its vibrational properties were studied experimentally, both in neat liquid (Fourier transform infrared spectroscopy and Raman) with the molecule isolated in argon matrix at lo...
The interaction of the mixed hydrido–tetrahydridoborate ruthenium(II) complex [(Triphos)RuH(η2‐BH4)] [1; Triphos = κ3‐P‐CH3C(CH2CH2PPh2)3] with alcohols of variable acidic strength [MeOH, FCH2CH2OH (MFE), CF3CH2OH (TFE), (CF3)2CHOH (HFIP), and (CF3)3COH (PFTB)] was the subject of a combine...
This paper describes the structure and magnetic properties of a novel cobalt 1-aminoethylidenediphosphonate compound, namely Co 3 {CH 3 C(NH 3 )(PO 3 H)(PO 3 )} 2 {CH 3 C(NH 3 )(PO 3 H) 2 } 2 (H 2 O) ...
Product yield studies indicate that the reaction of organic peroxy radicals (RO 2 ) with hydroperoxy radicals (HO 2 ) may proceed via four reaction channels:(R1a)RO 2 +HO 2 →ROOH+O 2 (R1b)RO 2 +HO 2 →ROH+O 3 (R1c)RO 2 +HO ...
Thermally assisted hydrolysis and methylation-gas chromatography (THM-GC) in the presence of trimethylsulfonium hydroxide (TMSH) was applied to the determination of fatty acid composition of lipids containing polyunsaturated fatty acid residues. By using this method, the polyunsaturated fatty ac...
The reaction of long-chain acyl thioesters, viz. lauric acid dodecyl thioester, 1,8-di-S-palmitoyl octanedithiol, and tristearoyl α-monothioglycerol, with trimethylsulfonium hydroxide in the presence of methanol leads to simultaneous derivatization of acyl moieties and S-alkyl moieties of acyl ...
A procedure for the determination of fatty acids (FA) and glycerol in oils has been developed. The method includes a derivatization step of the FAs into their methyl esters or a transesterification of the triacylglycerols with trimethylsulfonium hydroxide (TMSH), respectively. The analysis is ca...
In this study, an orthogonal array design was applied to know the way different parameters affected the derivatization of some herbicides that are commonly applied in the soils. Herbicides formulated as esters have been reported to rapidly hydrolyse, in contact with soil, to their corresponding ...
Thermally assisted hydrolysis and methylation-gas chromatography (THM-GC) in the presence of trimethylsulfonium hydroxide (TMSH) was applied to the analysis of the lipid contents and their fatty acid compositions in individual zooplankters, especially focusing on polyunsaturated fatty acid (PUFA...
Base-catalyzed transesterification of acyl lipids with methanol in the presence of trimethylsulfonium hydroxide (TMSH) is an easy and convenient method for the preparation of fatty acid methyl esters for gas chromatography (GC) analyses. Free fatty acids are converted to fatty acid methyl esters...
A method to determine alkylphenols in Ginkgo biloba sarcotesta, especially focusing on polyunsaturated ginkgolic acid components, was developed on the basis of thermochemolysis–gas chromatography/mass spectrometry with a DB-23 column in the presence of trimethylsulfonium hydroxide [(CH3)3SOH]. ...
The avian neurohypophyseal hormone arginine vasotocin (AVT) is known to be involved in the regulation of adrenocorticotropin (ACTH) release by interacting with the VT2 receptor (VT2R), which is homologous to the mammalian vasopressin V1b receptor (V1bR). To study the role of glucocorticoid in th...
Dendrosicyos socotrana Balf.f. is a unique species (Cucurbitaceae) native to Socotra island in the horn of Africa. From the chloroform extract of the stems, A new isocucurbitacin (Dendrocyin) with unusual cyclization in the side chain; 24β-ethoxy-20-25-epoxy-3α,16α-dihydroxy-9-methyl-19-norla...
(1,4/2)-Cyclohex-5-ene-triol was synthesized starting from cyclohexa-1,4-diene with two different approaches. Photooxygenation of cyclohexa-1,4-diene and epoxy-cyclohexene afforded anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-yl hydroperoxide and anti-7-oxabicyclo[4.1.0]hept-4-en-3-yl hydroperoxide, r...
Described are the efficient syntheses of β-galactose-type unsaturated carbasugar amine, N-octyl-4-epi-β-valienamine (1a, NOEV) and 6-deoxy NOEV (12), starting from (+)-proto-quercitol (2), which is readily provided by the bioconversion of myo-inositol. NOEV is a potent chemical chaperone drug ...
In continuation of development of bioactive inositol derivatives, a 1-O-methyl derivative of 5-amino-5-deoxy-l-talo-quercitol was designed and synthesized as an analogue of the strong α-fucosidase inhibitor, 5a-carba-α-l-fucopyranosylamine, the methyl branch being replaced with methoxyl, and d...
An effective synthesis of (+)-conduritol F, (+)-chiro- and (+)-epi-inositols from naturally available (+)-proto-quercitol is described. This synthetic method provides a concise synthesis of cyclitols in enantiomerically pure form. Of the synthesized cyclitols, (+)-conduritol F potently inhibits ...
(−)-vibo-Quercitol is a deoxyinositol (1l-1,2,4/3,5-cyclohexanepentol) that naturally occurs in oak species, honeydew honey, wines aged in oak barrels, and Gymnema sylvestre and is a potential intermediate for pharmaceuticals. We found that (−)-vibo-quercitol is stereoselectively synthesized fro...
Synthesis of muco-quercitol, (+)-gala-quercitol, and 5-amino-5-deoxy-d-vibo-quercitol is described from d-mannitol using ring closing metathesis and diastereoselective dihydroxylations as key steps.
Various types of 1-hydroxyindoles were prepared for the first time. Through methylation or acid catalyzed nucleophilic bromination ofN,N -dimethyl-1-hydroxytryptamine, simple syntheses of lespedamine and 5-bromo-N,N-dimethyltryptamine were achieved, respectively.
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