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120 results on '"Guo, Sheng"'

10. ChemInform Abstract: Two New Terpenoids from Fruits of Ziziphus jujuba

Author

Shu Lan Su, Jin Ao Duan, An Wei Ding, Guo Sheng, and Yu Ping Tang

Subjects
chemistry.chemical_classification, biology, Traditional medicine, General Medicine, biology.organism_classification, Sesquiterpene, food.food, Terpenoid, Terpene, chemistry.chemical_compound, food, Triterpene, chemistry, Ursolic acid, Ziziphus jujuba, Rhamnaceae
Abstract

One new ceanothane-type triterpene and one new sesquiterpene, together with two known triterpenes were isolated from the fruits of Ziziphus jujuba Mill. (Rhamnaceae). Based on the spectral analyses, the structures of two new compounds were elucidated as 2α-aldehydo-A(1)-norlup-20(29)-en-27,28-dioic acid (zizyberanal acid) (1), and zizyberanone (2). While the two known triterpenes were identified as zizyberanalic acid (3) and ursolic acid (4).

Published
2009

11. ChemInform Abstract: Copper(II) Bromide Catalyzed Novel Preparation of Propargylic Ethers and Sulfides by SN1-Type Substitution Between Propargylic Alcohols and Alcohols or Thiols

Author

Min Chen, Guo-sheng Huang, Hao-Hao Hui, Qin Zhao, De-Bing She, and Mingyu Yang

Subjects
Substitution reaction, Copper(II) bromide, chemistry.chemical_compound, chemistry, Nucleophile, Bromide, Regioselectivity, chemistry.chemical_element, Organic chemistry, General Medicine, Copper, Carbon, Catalysis
Abstract

A general and efficient copper(II) bromide catalyzed substitution reaction of propargylic alcohols with carbon and heteroatom-centered nucleophiles, such as alcohols and thiols, leading to the construction of C-O and C-S bonds has been developed. High product yields were obtained with excellent regioselectivity.

Published
2008

45. ChemInform Abstract: Syntheses, Crystal Structures and Magnetic Properties of Ternary Rare-Earth Zirconium Selenides, Ln2ZrSe5 (Ln: Ce-Nd).

Author

Guo, Sheng‐Ping, Chi, Yang, and Guo, Guo‐Cong

Subjects
*ALKALI metals, *ION exchange (Chemistry), *RAMAN spectroscopy
Abstract

Ce2ZrSe5 (I), Pr2ZrSe5 (II), and Nd2ZrSe5 (III) are prepared by solid state reaction of CeO2 or Pr6O11 or Nd2O3, ZrO2, Se, and boron as the reductant in the molar ratio of 2:1:5:6, resp. [ABSTRACT FROM AUTHOR]

Published
2016
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46. ChemInform Abstract: Sm3S3BO3: The First Sulfide Borate Without S-O and B-S Bonds.

Author

Guo, Sheng‐Ping, Chi, Yang, and Xue, Huai‐Guo

Subjects
*SAMARIUM compounds, *SULFIDES, *BORATE derivatives, *CHEMICAL bonds, *CHEMINFORMATICS
Abstract

Sm3S3BO3 is obtained via solid-state reaction of a 3:1:3 molar mixture of Sm2O3, B, and S (evacuated quartz tubes, staged heating at 300-950 °C, 5 h/stage, 10 d; cooling to 300 °C within 5 d). [ABSTRACT FROM AUTHOR]

Published
2016
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50. ChemInform Abstract: Eleven New Compounds in the Ln-Cd-Ge Systems (Ln: Pr, Nd, Sm, Gd-Yb; Y). Crystal Chemistry of the Ln2CdGe2 Series.

Author

Guo, Sheng-Ping, Meyers, John J., Tobash, Paul H., and Bobev, Svilen

Abstract

The title compounds are synthesized from mixtures of the elements in the ratio Ln:Cd:Ge = 1:25:1 (alumina crucible, 973 K, 2 d) and characterized by single crystal XRD and TB-LMTO electronic structure calculations. [ABSTRACT FROM AUTHOR]

Published
2012
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