Kohtaro Katayama

Improved Humidity-Resistant Hair Straightening Using Muconic Acid-Derived Amino Acid Compounds

Yuji Mochizuki, Sotaro Sato, Kohtaro Katayama, Kenji Matsumoto et autres

This study investigated the effects of incorporating muconic acid-derived amino acid compounds (CM) into a reductive hair-straightening formulation on hair shape stability and surface characteristics. Hair tresses obtained from Brazilian donors with moderately wavy to curly hair were treated with a cysteamine-based …

jp (code pays fourni par la source)

Improved Humidity-Resistant Hair Straightening Using Muconic Acid-Derived Amino Acid Compounds

Yuji Mochizuki, Sotaro Sato, Kohtaro Katayama, Kenji Matsumoto et autres

Abstract This study investigated the effects of incorporating muconic acid-derived amino acid compounds (CM) into a reductive hair-straightening formulation on hair shape stability and surface characteristics. Hair tresses obtained from Brazilian donors with moderately wavy to curly hair were treated with a …

jp, us (code pays fourni par la source)

Improved Humidity-Resistant Hair Straightening Using Muconic Acid-Derived Amino Acid Compounds

Yuji Mochizuki, Sotaro Sato, Kohtaro Katayama, Kenji Matsumoto et autres

Abstract This study investigated the effects of incorporating muconic acid-derived amino acid compounds (CM) into a reductive hair-straightening formulation on hair shape stability and surface characteristics. Hair tresses obtained from Brazilian donors with moderately wavy to curly hair were treated with a …

jp, us (code pays fourni par la source)

Improved Humidity-Resistant Hair Straightening Using a Cysteamine-Derived Amino Acid Compound

Yuji Mochizuki, Sotaro Sato, Kohtaro Katayama, Kenji Matsumoto et autres

This study investigated the effects of incorporating a novel amino acid compound (CM) into a reductive hair-straightening formulation on hair shape stability, mechanical properties, and surface characteristics. Hair trees from Brazilian donors were treated with a cysteamine-based straightening system, with or without …

Synthesis of a new amino acid derivative with long‐lasting hair shape control effects and elucidation of its mechanisms

Sotaro Sato, Kohtaro Katayama, Kenji Matsumoto, Hiroyuki Miyamoto et autres

OBJECTIVE: Hair is a crucial aspect of an individual's physical appearance. Thus, there is always a need for technology to care for curls and undulations. In this study, we found that heat treatment with a mixed aqueous solution of cysteamine (2-aminoethanethiol) and …

jp (code pays fourni par la source)

Efficient Synthesis of cis,cis-Muconic Acid by Catechol Oxidation of Ozone in the Presence of a Base

Kohtaro Katayama, Hiroki Hotta, Yoshio Tsujino

Muconic acid, a crucial precursor in synthesizing materials like PET bottles and nylon, is pivotal for the anticipated growth in the textiles and plastics industries. This study presents a novel chemical synthesis route for cis,cis-muconic acid (ccMA) using catechol. Biochemical methods face …

jp (code pays fourni par la source)

Efficient Synthesis of cis,cis-Muconic Acid by Catechol Oxidation of Ozone in the Presence of a Base

Kohtaro Katayama, Hiroki Hotta, Yoshio Tsujino

Muconic acid, a crucial precursor in synthesizing materials like PET bottles and nylon, is pivotal for the anticipated growth in textiles and plastics industries. This study presents a novel chemical synthesis route for cis,cis-muconic acid (ccMA) using catechol. Biochemical methods face scale-up …

Sequential Knoevenagel condensation/cyclization reaction using Meldrum’s acid

Shoko Yamazaki, Kohtaro Katayama, Yuki Iwataki, Yuji Mikata et autres

Sequential Knoevenagel condensation/cyclization using cyclic active methylene compounds such as Meldrum’s acid have been studied. The reaction of 2-(1-phenylvinyl)benzaldehyde and Meldrum’s acid, dimedone, or 1,3-indandione with piperidine/AcOH or L-proline at room temperature for 17–18 h gave cyclized indene derivatives in 63–80% yield. …

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CCDC 2105106: Experimental Crystal Structure Determination

Shoko Yamazaki, Kohtaro Katayama, Zhichao Wang, Yuji Mikata et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

Sequential Knoevenagel Condensation/Cyclization for the Synthesis of Indene and Benzofulvene Derivatives

Shoko Yamazaki, Kohtaro Katayama, Zhichao Wang, Yuji Mikata et autres

N and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The reaction of variously substituted aryl derivatives with dimethyl malonate gave indene and benzofulvene derivatives. The reactions of 2-(1-phenylvinyl)benzaldehyde with Meldrum's acid or malononitrile also gave cyclized compounds in the suitable sequential or stepwise conditions. Furthermore, the reaction …

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Sequential Knoevenagel condensation/cyclization for the synthesis of indene and benzofulvene derivatives

Kohtaro Katayama

INTRA- AND INTERMOLECULAR STEREOSELECTIVE [2+2] CYCLOADDITION REACTIONS OF ETHENETRICARBOXYLATES AND STYRENES

Shoko Yamazaki, Kohtaro Katayama, Tsumoru Morimoto