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Chemical Evaluation of Betula Species in Japan. II. Constituents of Betula platyphylla var. japonica
The constituents of Betula platyphylla var. japonica were identified as follows : Fresh leaves : 12-O-acetyl-3-O-malonylbetulafolienetriol, 12-O-acetyl-3-O-malonylbetulafolienetriol oxide I
Chemical Evaluation of Betula Species in Japan. I.Constituents of Betula ermanii
The constituents of Betula ermanii CHAM. in Japan were identified as follws. Fresh leaves : 20(S), 24(R)-epoxydammmaran-3β, 11α, 25-triol (1), 3-O-β-D-glucopyranoside of 1 (2), 2'-acetate of 2 (3),
Reexamination of the RICO method
Information about bridge structure and functionalities has been considered to be crucial in estimating the reactivity of coals, and the purpose of this study is to improve the validity of the RICO
Iridium-Catalyzed Reaction of 1-Naphthols, N-(1-Naphthyl)benzenesulfonamides, and Salicylaldehyde with Internal Alkynes
1-Naphthols efficiently couple with internal alkynes via cleavage of the C–H bond at the peri-position in the presence of a catalyst system of [IrCl(cod)]2/PBut3 to selectively afford the
Chemical Evaluation of Betula Species in Japan. III. Constiutents of Betula maximowicziana
The constituents of Betula maximowicziana REGAL in Japan were identified as follows. Fresh leaves : 12β-acetoxy-20(S), 24(R)-epoxy-3α, 17α, 25-trihydroxydammarane, 20(S), 24(R)-epoxy-3α, 17α,
Ligand-Controlled Cross-Dimerization and -Trimerization of Alkynes under Nickel Catalysis
The cross-dimerization of diphenylacetylene with trimethylsilylacetylene via C¯H bond cleavage in the presence of a catalytic amount of bis(cyclooctadiene)nickel [Ni(cod) 2 ] together with a
Chemical Evaluation of Betula Species in Japan. IV. Constituents of Betula davurica
The constituents of Betula davurica PALL. were identified as follows : Fresh leaves : 12-O-acetylbetulafolieneteraol oxide, I, 5, 8-dihydroxy-6, 7-dimethoxyflavone, rutin. Outer bark : betulin,
Chemical Evaluation of Betula Species in Japan. VI. Constituents of Betula schmidtii
The constituents of Betula schmidtii REGAL were identified as follows. Fresh leaves : methyl (12R, 20S)-20-hydroxy-12-β-D-xylopyranosyloxy-3, 4-secodammara-4(28), 24-dien-3-oate (betula-schmidtoside
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