Katsuo Ohkata

Synthesis and chemical behaviors of 12-substituted dibenz[c,f][1,5]azastibocine and dibenz[c,f][1,5]azabismocine derivatives: evidences of 10-Pn-4 type hypervalent interaction

Katsuo Ohkata, Shin Takemoto, Masako Ohnishi et al. · Tetrahedron Letters · 1989 · 74 citations

Derivative (Chemistry), Chemical Behaviors, Derivatives +5

Tandem reactions in 4-siloxy-1-benzopyrylium salts: introduction of substituents and cyclohexene and cyclopentane annulation in chromones

Yong Gyun Lee, Kenji Ishimaru, Hideharu Iwasaki et al. · The Journal of Organic Chemistry · 1991 · 70 citations

Chemical Engineering, Chemical Measurement, Engineering +13

Asymmetric synthesis of activated cyclopropanes catalyzed by cinchonidine as a chiral Brønsted base

Satoshi Kojima, Maki Suzuki, Akito Watanabe et al. · Tetrahedron Letters · 2006 · 54 citations

Chiral Brønsted Base, Engineering, Asymmetric Synthesis +7

Ring transformation equilibrium (bond switch) in 5-(2-aminovinyl)isothiazole system via hypervalent sulfurane. Synthesis, structure determination, and kinetic study

Kin‐ya Akiba, Kohichi Kashiwagi, Yoshihiko Ohyama et al. · Journal of the American Chemical Society · 1985 · 49 citations

Engineering, Heterocyclic, Biochemistry +11

Structural Features of Tetraazathiapentalenes Fused with Pyrimidine and/or Pyridine Rings. Experimental Evaluation of the Nature of Hypervalent N−S−N Bond by Restricted Internal Rotation of the Pyrimidine Ring

Katsuo Ohkata, Minoru Ohsugi, Kazuhiro Yamamoto et al. · Journal of the American Chemical Society · 1996 · 49 citations

Structural Features, Inorganic Chemistry, Chemical Engineering +13