bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structures of silylenoids and effects of metallic and haloid atoms on their stability
Authors: Feng, Sheng‐Yu , Feng Da‐Cheng , Deng Cong‐Hao 
Published: September 2010

AbstractThe structural characteristics of silylenoids, H2SiMX, where M = Li or Na and X = F or Cl, have been studied by ab initio calculations. H2SiMX can be represented as adducts of silylene H2Si with alkali metal halogenides, MX. The associative energies at different calculational levels of various structures of H2SiMX are given. Effects of metallic and haloid atoms on the stability of various structures of H2SiMX are also discussed in this paper.
II conjugation in the butadiene
Authors: Mo Yi‐Rong , Wu Wei , Zhang Qian‐Er 
Published: September 2010

AbstractThe π electronic delocalization in trans‐C4H6 and cis‐C4H6 has been investigated in the frame of ab initio valence bond theory with 6–31G basis set. The result shows that the Csp2‐Csp2 single bond length (1.506 Å) is only about 0.024 Å shorter than the Csp3‐Csp3 bond, thus the central bond length shortening would be mainly due to π conjugation. The theoretical resonance energies of the trans‐C4H6 and cis‐C4H6 are 8.48 and 7.44 kcal/mol, respectively.
Reactions of [Et3NH][(μ‐CO)(μ‐RS)Fe2(CO)6] with acetylenes. Synthesis of (μ‐σ,π‐p‐MeC6H4CCHPh)(μ‐RS)Fe2(CO)6 and (μ‐σ,π‐PhCCHC6H4Me‐p)(μ‐RS)Fe2(CO)6. The crystal structure of (μ‐σ,π‐p‐MeC6H4CCHPh)(μ‐tBuS)Fe2(CO)6
Authors: Song Li‐Cheng , Hu Qing‐Mei , He Jun‐Ling , Wang Ru‐Ji , Wang Hong‐Gen 
Published: September 2010

AbstractThe reactions of [Et3NH][μ‐CO)(μ‐RS)Fe2(CO)6] (1a‐d) (RnPr, nBu, tBu, Ph) with p‐MeC6H4C°CPh or m‐NO2C6H4C°CPh were studied and products of the vinyl type (μ‐σ,π‐p‐MeC5H4CCHPh)(μ‐RS)Fe2(CO)6 (2) and (μ‐σ, π‐phCCHC6H4Me‐p) (μ‐RS)Fe2(CO)6 (3) (RnPr, nBu, tBu, Ph) were obtained. While the structures of all the compounds 2a‐d and 3a‐d were characterized by elemental analysis, IR, 1H NMR and MS spectroscopies, the single‐crystal structure of 2c(RtBu) was determined by X‐ray diffraction method. The X‐ray diffraction result of 2c showed that the substituted vinyl ligand p‐MeG6H4CCHPh bridges the two iron centers, being σ‐bonded to one metal through the olefinic carbon attached to p‐MeC6H44 group, while π‐bonded to the other via olefinic linkage; the Fe2(CO)6 and proton units are in a cis fashion and the tBu group is bonded to sulfur atom through an e‐type of bond.
Synthesis and mesomorphic behaviour of 4′‐methoxyphenyl 4″‐[(4‐n‐alkoxy‐2,3,5,6‐tetrafluorophenyl)ethynyl]benzyl ethers
Authors: Wen Jian‐Xun , Yin Hui‐Yong , Tian Min‐Quan , Cheng Qi 
Published: September 2010

AbstractA novel homologous series of 4′‐methyoxyphenyl 4″‐[(4‐n‐alkoxy‐2,3,5,6‐tetrafluoro‐phenyl]benzyl ethers have been prepared via Pd‐catalysed Heck reactions. Polarizing microscopic textural observation shows that these compounds exhibit enantiotropic nematic phases.
New conducting polythiophenes containing substituted polyfluorinated alkoxy chain
Authors: Zhang Xu‐Qing , Shen Xue‐Ming , Yang Shi‐Yong , Zhang Jing‐Yun 
Published: September 2010

AbstractA series of poly(fluoroalkoxy thiophenes) have been prepared by electrochemical and chemical polymerization respectively. The substitution of thiophene by poryfluorinated alkoxy chains affords more favorable structures in electronic effect and higher stabilities of their polymers than conventional alkoxy chain substituted polymers.
Synthesis and bioassay of all four stereoisomers of (2E,4E)‐4,6,10,12‐tetramethyl‐2,4‐tridecadien‐7‐one, the assignment of the absolute configuration of the sex pheromone of Matsucoccus matsumurae Japanese pine bast scale
Authors: Lin Guo‐Qiang , Xu Wei‐Chu , Qi Yun‐Tai , Chen Guo‐Min 
Published: September 2010

AbstractA facile enantioselective synthesis of all four stereoisomers of (2E,4E)‐4,6,10,12‐tetramethyl‐2,4‐tridecadien‐7‐one (1) is described. The stereochemistry at 6‐C and 10‐C of 1 was constructed by using optically active citronellal as starting material and by the asymmetric crotylic metal reaction. In the bioassay and field tests, only la, i.e. (6ii,10ii)‐l was active. The other three isomers 1b (6S,10R), 1c (6R,10 S) and 1d (6S,10S) were inactive. Therefore, the naturally occurring pheromone was assigned as (6R,10R)‐1.
Scanning electrochemical microscopy –‐ development of instrumentation utilizing piezo‐bimorph X‐Y scanners
Authors: Mao Bing‐Wei , Mu Ji‐Qian , Zhug Xiang‐Dong , Feng Zu‐De , Yan En‐Rou , Pan Guo‐Bin , Xie Zhao‐Xiong , Ren Bin 
Published: September 2010

AbstractThe development of the instrumentation of a scanning electrochemical microscopy (SECM) is presented. The core of the SECM sensing system is constructed based on piezo‐bimorph scanners, a mechanical micropositioner of multi‐dimensional adjustment and ultramicroelectrodes. The control of the electrochemical cell and the SECM system is realized by a battery powered bipoteniostat and analog control circuits respectively with the control of a microcomputer work station. The demonstrations of SECM experiments are given on both a standard IDA sample and a silver electrode. Discussions on the resolution and quality of SECM image are made.
Effects of liquid crystal states on photovoltaic effects of chlorophyll‐a
Authors: Han Yun‐Yu , Zhou Rui‐Ling , Yang Yu‐Guo , Zhou Wu , Ruan Xiao‐Lan 
Published: September 2010

AbstractThe photovoltaic effects of chlorophyll‐a(chla) and the effects of stearic acid, egg phosphatide and cholesterol on those were investigated by means of measuring the photoinduced potentials of SnC2/chla electrodes. Because of the formation of liquid crystal states, appropriate concentrations of stearic acid and egg phosphatide added in a certain system could increase the photovoltaic effects of chla. Cholesterol always decreased the photovoltaic effects of chla because there was no liquid crystal state formed with it.
The effects of alkali metal(Na+,K+) on the exchange degree of Hβ zeolite and the catalytic properties of the alkalized zeolites
Authors: Shen Jian‐Ping , Ma Jun , Sun Tie , Jiang Da‐Zhen , Min En‐Ze 
Published: September 2010

AbstractThe effects of alkali metals (Na+,K+) on the exchange degree of Hβ zeolite under different conditions and the conversion of α(or β)‐methylnaphthalene over the alkalized zeolites were studied. The results showed that the H+ of Hβ zeolite is totally replaced by the Na+ of NaCl solution, while partially exchanged by the K+ of KCl solution, there is an exchange equilibrium between the H+ and K+ for Hβ zeolite (Si/Al=17.23) and the value of equilibrium is 88.39. The exchange degree also increases with increasing the Si/Al of the samples. It was suggested that these results are attributed to the electrostatic field in the pore of Hβ zeolite and the nature of zeolite and the properties of alkali metal. The isomerization of α(or β)‐methylnaphthalene is the main reaction over the samples and it is more favour on the proper acid‐base sites of KHβ zeolite.
Effect of intramolecular energy transfer on the rate of unimolecular isomerization: HCN⟷HNC
Authors: Zhao Mei‐Shan 
Published: September 2010

AbstractThis paper reports calculations of the rate of isomerization of HCN→HCN based on the theory of Gary and Rice as extended by Zhao and Rice. The major task is to determine the effect of intramolecular energy transfer on the prediction of the rate of isomerization. Both the full three‐dimensional (3D) system and the reduced two‐dimensional (2D) system obtained from freezing CN bond at 1.159 A are analyzed to check the validity of the freezing bond approximation. Meanwhile, RRKM rates are calculated to test RRKM choice of the transition state by comparing to Gary‐Rice three‐state model. The comparison shows that the rates from 2D model and 3D model are differing up to 20% with 2D rates consistently larger. The intramolecular energy transfer modifies the isomerization rate for HCN system up to 30% that is modestly small by the expectation. The isomerization rate predicted from RRKM theory is greater than those of Gary‐Rice three‐state model theory up to 65%, and it overstimates the rates under all considerations, including the contribution from intramolecular energy transfer, for the studied system by about a factor of 2.
Peptide synthesis using pentafluorophenyl diphenylphosphate (FDP) as coupling reagent
Authors: Chen Shao‐Qing , Xu Jie‐Cheng 
Published: September 2010

AbstractComparison of the reaction speed and yield with its analogues and some conventional peptide coupling reagents, pentafluorophenyl diphenylphosphate (FDP) was shown to be a more preferable “active ester” type reagent for the peptide synthesis. The synthesis of oligopeptides using FOP was achieved with high yields. The influences of several reaction parameters such as solvent, base, additive and temperature on the coupling reaction were studied using HPLC method. The degree of racemization with FDP determined by HPLC or Young test was shown to be lower than that of DCCI. Octapeptide Gly‐Cys(Bzl)‐Ser‐Gly‐Lys‐Leu‐Ile‐Cys(Bzl)‐OH, corresponding to the amino acid sequence of gp41 of HIV‐1, was successfully synthesized by 5+3 approach using FDP with high yield.
Nonadiabatic collision model calculations of ion‐pair formation cross sections of Cs+O2→Cs++O
Authors: Cai Zheng‐Ting , Mu Yu‐Guang , Cong‐Hao Den G. 
Published: September 2010

AbstractThis paper has improved Hickman's nonadiabatic collision model by substituting Hickman's constant velocity classical straight line trajectory approximation with the solution of motion equation mR=−dV(R)/dR, and has calculated the cross sections of ion‐pair formation Cs+O2→Cs++O−2 with the improved nonadiabatic collision model (INCM). A comparison of our results with other theoretical and experimental results has been made.
Studies on monodispersed colloidal particles of doped yttrium compounds
Authors: Deng Hong‐Mei , Xu Yan , Gu Yi‐Dong 
Published: September 2010

AbstractMonodispersed particles of doped yttrium basic carbonates were prepared at aging at elevated temperature corresponding salts solutions in the presence of urea. Coprecipitation in mixed solutions of yttrium, lanthanum and neodymium salts under similar experimental conditions yielded composite particles of basic carbonates. The content of the three metals in the solids followed closely the initial composition of the reacting solutions. On calcination all prepared solids converted to their corresponding oxides while retaining their particle morphology. The so‐prepared powders were characterized by various techniques.
Surface acoustic wave sensor system applied to the kinetic study of urease in plant seeds
Authors: Liu De‐Zhong , Chen Kang , Ge Kai , Me Li‐Hua , Yao Shou‐Zhuo 
Published: September 2010

AbstractA new type of the surface acoustic wave (SAW) sensor system was delivered. Urease from several kinds of plant seeds was extracted with different extracting solvents. The urease activity, Michaelis constant and other kinetic parameters were estimated for the first time by means of the new device–‐SAW sensor system. Some factors such as pH, temperature, activators and inhibitors are also discussed. The method can be applied to the determination of urea content in human urine and the experimental results consist with those reported.
Red yeast catalyzed amination of olefinic bonds and synthesis of optically pure S‐amino acids
Authors: Zhao Jian‐Shen , Yang Shun‐Kai 
Published: September 2010

AbstractBy using red yeast (Rhodotorula rubra AS 2.166) resting cells which possess the phenylalanine ammonia‐lyase (PAL, EC 4.3.1.5) activity as biocatalyst, enantiomerically pure S‐3‐(2‐chloro‐phenyl) alanine (2a) and S‐3‐(3‐hydroxyphenyl) alanine (2d) have been synthesized from the corresponding 3‐aryl substituted acrylic acid (1a and 1d) and ammonia.
Large scale synthesis of oligoribonucleotides on PEG by the phosphite triester approach
Authors: Xu Zu‐Sheng , Yang Zai‐Wan , Wang Yu 
Published: September 2010

AbstractLarge scale synthesis of oligoribonucleotides has been successfully performed on PEG support by the phosphoramidite approach using t‐butyldimethylsilyl to protect the 2'‐hydroxyl group of ribonucleoside. By means of this procedure, the dodecamer r(AGUGGUCUUUGU) was synthesized in 98.1% average coupling yield, and 55 mg pure product was obtained from one gram of functionalized PEG.
Atemoyacin A: A new bis‐tetrahydrofuranyl annonaceous acetogenin from Annona atemoya H.
Authors: Chen Wen‐Sen , Yao Zhu‐Jun , Zhang Yi‐Bin , Xu Yong‐Zhen , Wu Yu‐Lin 
Published: September 2010

AbstractAtemoyacin A, a new annonaceous acetogenin was isolated from the alcoholic extract of the seeds of Annona atemoya Hort (Annonaceae). Its structure and relative configuration were elucidated on the basis of the spectral analysis.
Exact quantum and TST‐CEQ study of the collinear reaction O+HCl
Authors: Ju Guan‐Zhi , Chen De‐Zhan 
Published: September 2010

AbstractExact quantum calculations of reaction probabilities have been carried out using hyperspherical coordinates for the collinear reaction O+HCI(v ⩽1) → OH(v′⩽1)+Cl. A generalized LEPS potential energy surface with a barrier height of 8.12 kcal/mol has been used in the calculations. According to the calculated results we found that (1) the reaction probability oscillates with energy, (2) the reaction probability shows vibrational adiabaticity, although it is poorer than that for symmetric reaction Cl + HCl. The analysis of resonance has also been done. The reaction rate constants and average cross sections have been calculated by TST‐CEQ method. The rate constants are in agreement with that by QCT and smaller than the experimental one. Finally, the threshold has been estimated and is in good agreement with that of the literature.
Synthesis and characterization of trisubstituted heteropolytungstogermanates containing group 3A elements
Authors: Meng Lu , Liu Jing‐Fu , Wu Yi‐Jie , Xiao Yan‐Wen , Zhao Da‐Qing 
Published: September 2010

AbstractSix new compounds, α,β‐KaHb,[GeW9M3(H2O)3O37] xH2O(M = Al, Ga, In; a + 6 =7) and α‐K9H5[Ge2W18Ga6(H2O)3O74]·20H2O, were synthesized from the lacunary precursors a and β‐GeW9O10−34 and characterized by elemental analysis, spectroscopy and electrochemistry. Tungsten‐183 NMR spectra of the title complexes consist of two lines with intensity ratio 2:1 as expected for trisubstituted heteropoly anions. The intensity ratio of α‐Ga compound is 1:2, which is different from others(2:1). With the help of FAB mass spectrum, we concluded that it is a dimer with D3h structure in aqueous, and the others exist by monomers with C30 structures.
A new strategy for the stereoselective synthesis of 2,3‐dideoxy‐3‐fluoro‐D‐ribofuranose derivatives
Authors: Guo Zhong‐Wu , Huang Bao‐Guo , Xiao Wen‐Juan , Hui Yong‐Zheng , Stanley A. 
Published: September 2010

AbstractThe important intermediate for syntheses of various anti‐HIV nucleoside analogues, methyl 2,3‐dideoxy‐3‐fluoro‐6‐O‐(p‐methylbenzoyl)‐α‐D‐ribofuranoside, was synthesized starting from 2‐deoxy‐D‐ribose in 5 steps with an overall yield of 24%. This strategy can be also used for synthesizing other analogues with various substitutions at 3‐C position.
Direct synthesis of per(poly)fluoroalkylmethyl‐substituted electrophilic cyclopropane derivatives
Authors: Chen Jian , Hu Chang‐Ming 
Published: September 2010

AbstractA convenient and direct per(poly)fluoroalkylmethyl‐introducing cyclopropanation reaction was described. In the presence of CrCl3/Fe, per(poly)fluoroalkyl iodides reacted with diethyl allylmalonate and its analogs to give per(poly)fluoroalkymethyl‐substituted electrophilic cyclopropane derivatives in high yields. This reaction was considered to proceed by two steps: radical addition followed by cyclopropanation.
Lipases catalyzed acetylation of meso‐2,4‐dimethyl‐1,5‐pentanediol and the synthesis of Prelog‐Djerassi lactone
Authors: Lin Guo‐Qiang , Xu Wei‐Chu 
Published: September 2010

AbstractLipase catalyzed acetylation of 2 afforded 3 with the e.e. up to 98%. Utility of 3 was illustrated by the preparation of Prelog‐Djerassi lactones 7a and 7b.
Dynamical studies of the reaction H++He+He→HHe++He
Authors: Yu Hua‐Gen 
Published: September 2010

AbstractThe classical trajectory method is employed to calculate the rate coefficient kr for the reaction H ++He+He→HHe+ + He at the temperatures ranging 200–350 K, based on an ab initio potential energy surface. The results show that kr is strongly dependent on the temperature, which can be well fitted by the function kr=ATDr‐3 with A=4.192×10−31 cm6/s and the reaction dimension Dr=2.706. The product molecules HHe+ are found in high vibrational states.
Enantiomeric separation of α‐phenylethylamine and its derivatives by series coupled open tubular columns
Authors: Zhou Liang‐Mo , Liu Xue‐Liang , Li Zhong‐Sheng , Wang Qing‐Hai , Zhu Dao‐Qian , Hu Dong‐Hong 
Published: September 2010

AbstractA series coupled fused‐silica open tubular columns of a chiral and an achiral stationary phase were used to achieve the enantiomeric separation of a‐phenylethylamine, o,m,p‐methyl‐ and o,m,p‐methoxy‐α‐phenylethylamine. A simplified equation describing the retention values of series coupled columns was derived, which relates the capacity factors of series coupled columns to the capacity factor of individual columns, their lengths, inlet and outlet pressure. Very good agreement was obtained both between calculated values by this equation and those by Krupcik's equation and between values measured experimentally and calculated theoretically. By means of this simplified equation a computer program was developed in locating the operating range of optimum αmin, enantiomeric separation of all α‐phenylethylamine and its derivatives were achieved in a single run.
Synthesis of dimethyl 3‐perfluoroalkyl‐4‐(3‐oxo‐2‐triphenyl‐phosphoranylidenbutanylidene)‐pent‐2‐enedioate and its cyclization
Authors: Ding Wei‐Yu , Cao Wei‐Guo , Yao Yuan , Zhu Zhong‐Mei 
Published: September 2010

AbstractThe title compounds 5a–‐5c were prepared via the reaction of methyl 2‐perfluoroalkynoates (4) with methyl 5‐oxo‐4‐(triphenylphosphoranylidene)hex‐2‐enoate (3), which was obtained from the reaction of methyl propynate (2) with acetylmethylenetriphenylphosphorane (1) at–‐5–0°C. Intramolecular elimination of Ph3PO took place when compound 5 was heated in aqueous methanol at 115–120°C in sealed tube, yielding dimethyl 2‐trifluoromethyl‐4‐methylisophthalate (6a) from 5a and methyl 5‐acetyl‐4‐hydroxy‐2‐heptafluoropropanylbenzoate (6b) from 5b, respectively. The structures of compounds5, 6a and 6b were confirmed by IR, MS, 1H NMR, 19F NMR and 13C NMR spectroscopy and elemental analyses. Reaction mechanisms for the formation of compounds5, 6a and 6b were proposed.
Isomeric structures, isomerization and decomposition of silylenoids H2SiMX (MXKF, KCl, LiBr, NaBr and KBr)
Authors: Feng Da‐Cheng , Feng Sheng‐Yu , Deng Cong‐Hao 
Published: September 2010

AbstractThe isomeric structures, isomerization and decomposition of silylenoids H2SiMX (MXKF, KC1, LiBr, NaBr and KBr) have been investigated by ab initio molecular orbital theory. These silylenoids have four kinds of very similar equilibrium structures. The three‐membered ring and p‐complex structures should be stable and experimentally detectable. The lifetime of σ‐complex and tetrahedral structures would be very short and experimentally undetectable.
Theoretical studies on the mechanism of the thermal decarboxylation and decarbonylation of a number of α‐keto‐acids
Authors: Chen Li‐Tao , Chen Guang‐Ju , Fu Xiao‐Yuan 
Published: September 2010

AbstractBoth processes of decarboxylation and decarbonylation of a number of acids including RCOCO2H, RH, CH3, CH2F, CF3, CHCH2, Ph, OH have been studied by semi‐empirical MO theory AM1 method to verify the reaction mechanism of each process and the effect of different substituents on them. The calculated results are consistent with the experimental reports and can be summed up as follows: (1) The decarboxylation of these acids to form aldehydes and carbon dioxide is concerted and takes place through a 4‐membered ring transition state in which a partial negative charge develops on the carbon of the α‐carbonyl group, so that the inductive effect of some substituents is favourable for this process. (2) Their decarbonylation into carboxylic acids and carbon monoxide however is the attack of the OH on the carbon of the alkyl portion of the acid, forming a 3‐membered ring transition state. (3) The activation energy of decarbonylation is lower than that of decarboxylation, since oxygen is more nucleophilic than hydrogen and also the strong OH bond need not to be broken.
STM image of tungstosilicic acid molecular layer on highly oriented pyrolytic graphite
Authors: Zhang Bai‐Lin , Wang Er‐Kang 
Published: September 2010

AbstractMolecular layer of tungstosilicic acid (H4SiW12O40) deposited on freshly‐cleaved highly oriented pyrolytic graphite (HOPG) was observed by scanning tunneling microscopy (STM) in air at room temperature. The molecular dimension (11.5 Å) of H4SiW12O40 measured by STM is consistent with known crystallographic parameter. We also imaged the boundary of H4SiW12O40 molecular layer on HOPG showing that molecular layer of H4SiW12C40 was formed. It has been proved that individual tungstosilicic acid species is imaged. The probable reason for the formation of the molecular layer is also discussed.
Synthesis and structure of tetranuclear copper(II) complex containing μ4‐oxo bridge
Authors: Zhang Wen‐Xing , Ma Chang‐Qin , Wang Xu‐Ning , Yu Zheng‐Gang , Lin Qi‐Jun , Jiang De‐Hua 
Published: September 2010

AbstractA new dinucleating Schiff base ligand HL(LC13H17N2O−3) has been synthesised and characterized. The single crystal structure of its complex [L2Cu4O(AcO4)]·2H2O has been determined by X‐ray diffraction methods. The result indicates that every Cu atom has its square pyramidal coordination polyhedron and there is a tetrahedral Cu4O core in the complex molecule. Its active sites where catalytic oxidation of dioxygen occurs have been inferred.
Synthesis and characterization of adducts of p‐azidostyrene derivatives to fullerene C60
Authors: Li Ji‐Sheng , Dong Guo‐Xiao , Feng Jun , Ji Gai‐Jiao 
Published: September 2010

AbstractFullerene C60 reacted with p‐azidostyrene derivatives in refluxing chlorobenzene, yielding monoadducts 2a and 2d as well as diadduct 2c with aziridine structure at 6/6‐ring junctions. Experimental results showed that the addition of the second azide to the monoadduct was regioselective. The diadduct, of Ca symmetry in C60 moiety, was unstable by opening to be 1,6‐imido[10]annulene structure.
Synthesis, characterization and electrical conductivity of poly[ethyl trifluorobuty‐2‐noate]
Authors: Yang Shi‐Yong , Zhao Wen‐Yan , Huang Yao‐Zeng , Zhang Xu‐Qing , Zhang Jing‐Yun 
Published: September 2010

AbstractPoly[ethyl trifluorobuty‐2‐noate] (PETFB) was prepared from ethyltrifluorobuty‐2‐noate by anionic polymerization. The polymer was examined by UV‐Vis, IR and NMR spectrometries. It possessed π‐conjugated backbone in the main chain. No significant variation in the electrical conductivity of BF3‐doped PETFB was observed after more than three months' storage, indicating improved conductive stability in air as compared with polyacetylene.
Stellarins F and G, two new cyclopeptides from Stellaria yunnanensis
Authors: Zhao Yu‐Rui , Wang Xian‐Kai , Zhou Jun , Cheng Chang‐Xiang , Huang Xiao‐Lin , Wu Hou‐Ming 
Published: September 2010

AbstractIn the previous papers, we reported the structural elucidation of stellarins A‐E, five new cyclopeptides from the fresh roots of Stellaria yunnanensis Franch. Further chemical study on this plant led to the isolation of two other new cyclopeptides named stellarins F(1) and G(2). By a combination of 2D‐NMR, enzymatic degradation and FABMS, their structures were established to be cyclo(Gly‐Ala‐Gly‐Ser‐Pro‐Trp‐Phe‐Pro) and cyclo(Gly‐Ala‐Tyr‐Leu‐Ala), respectively.