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Mitsuru Ueda

Publications and source records attributed to Mitsuru Ueda.

5 recordsLinked to original sources
PubMed2006

Facile synthesis of aryl ether dendrimer from unprotected AB2 building blocks using thionyl chloride as an activating agent.

[structure: see text] A novel, rapid, inexpensive, and highly efficient convergent approach for the synthesis of a Fréchet- type aryl ether dendrimer using thionyl chloride has been developed. In this method, the purification of each dendron and a dendrimer occurs by recrystallization, extraction, and precipitation. The MALDI-TOF MS spectrum supported the formation of the G2, G3, and G4 dendrons and the star-shaped G4 dendrimer.

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PubMed2003

Facile synthesis of polyamide dendrimers from unprotected AB2 building blocks.

[structure: see text]. A fast, inexpensive, and highly efficient synthesis of aromatic polyamide dendrimers without the need for protection and deprotection steps has been developed. Dendrons and third-generation polyamide dendrimers were easily prepared by a convergent approach involving activation of a focal point with thionyl chloride, followed by condensation with unprotected AB2 building blocks.

Journal Article↗
PubMed2003

Rapid synthesis of polyamide dendrimers from unprotected AB2 building blocks.

A rapid synthetic method for the preparation of polyamide dendrimer without protection and deprotection steps has been developed. A symmetrically branched third-generation polyamide dendrimer was prepared by a convergent method involving activation of focal point with a condensing agent, diphenyl (2,3-dihydro-2-thioxo-3-benzoxazolyl)phosphonate (DBOP), followed by condensation of the active amide with the diaminocarboxylic acid 3,5-bis(4-aminophenoxy)benzoic acid as an AB2 building block.

Journal Article↗
PubMed2002

1.1-GHz continuous-wave EPR spectroscopy with a frequency modulation method.

Continuous-wave EPR spectroscopy using a frequency modulation (FM) scheme was developed. An electronically tunable resonator and an automatic tuning control (ATC) system were used. Using the FM scheme instead of magnetic field modulation, we detected EPR absorption at the first derivative mode. We used a microwave frequency of 1.1 GHz in the present experiment. Similar signal-to-noise ratios were obtained with conventional field modulation and the FM method, and a low-quality factor EPR resonator was not necessary to suppress the significant microwave reflection from the resonator. The FM method with a tunable resonator may be an alternative solution to achieving phase-sensitive detection, when the side-effects of magnetic field modulation, such as microphonic noise and mechanical vibration, are detrimental for EPR detection.

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