Barriers to rotation of methyl groups in methyltriptycenes
F Imashiro, K Takegoshi, T Terao…
Index: Imashiro, Fumio; Takegoshi, Kiyonori; Terao, Takehiko; Saika, A. Journal of the American Chemical Society, 1982 , vol. 104, # 8 p. 2247 - 2251
Full Text: HTML
Citation Number: 10
Abstract
Abstract: Rotational barriers of methyl groups in methyltriptycenes are determined from the temperature dependence of the'H spin-lattice relaxation times. Barriers of bridgehead methyls increase appreciably by methyl substitution at peri positions, which suggests probable absence of the gear effect. Calculations by the molecular mechanics (MMI) method and the molecular orbital (CNDO/FK) method favor a clashed-gear conformation for ...
Related Articles:
New metal–organic frameworks from triptycene: structural diversity from bulky bridges
[Crane, Angela K.; Patrick, Brian O.; MacLachlan, Mark J. Dalton Transactions, 2013 , vol. 42, # 22 p. 8026 - 8033]
Reactivity of benzyne toward anthracene systems
[Klanderman,B.H.; Criswell,T.R. Journal of Organic Chemistry, 1969 , vol. 34, p. 3426 - 3430]
[Regan,T.H.; Miller,J.B. Journal of Organic Chemistry, 1967 , vol. 32, p. 2789 - 2794]
Reactivity of benzyne toward anthracene systems
[Klanderman,B.H.; Criswell,T.R. Journal of Organic Chemistry, 1969 , vol. 34, p. 3426 - 3430]