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・ Helicarion rubicundus
・ Helicarionidae
・ Helicarionoidea
・ Helicarrier
・ Helicascus
・ Helicase
・ Helicase-dependent amplification
・ Helicat
・ Helice (genus)
・ Helice tridens
・ Helicella
・ Helicella itala
・ Helicella orzai
・ Helicella stiparum
・ Helicella striatitala
Helicene
・ Helichochaetus
・ Helichrysopsis
・ Helichrysum
・ Helichrysum aciculare
・ Helichrysum arachnoides
・ Helichrysum arenarium
・ Helichrysum balfourii
・ Helichrysum biafranum
・ Helichrysum cameroonense
・ Helichrysum gymnocephalum
・ Helichrysum italicum
・ Helichrysum leucopsideum
・ Helichrysum luteoalbum
・ Helichrysum mannii


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Helicene : ウィキペディア英語版
Helicene

In organic chemistry, helicenes are ortho-condensed polycyclic aromatic compounds in which benzene rings or other aromatics are angularly annulated to give helically-shaped molecules. The chemistry of helicenes has attracted continuing attention because of their unique structural, spectral, and optical features.〔''Helicenes: Synthesis and Applications'' Yun Shen and Chuan-Feng Chen Chemical Reviews Article ASAP 〕〔''Diels–Alder Additions of Benzynes within Helicene Skeletons'' David Zhigang Wang, Thomas J. Katz, James Golen, and Arnold L. Rheingold J. Org. Chem.; 2004; 69(22) pp 7769–7771 〕
==Structure==
For helicenes with 6 benzene units a 360° turn is completed. In the helicene series the dihedral angles between the extremities increases going from ()helicene (26°) to ()helicene (58°) and then decreases again for example in ()helicene (30°).

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