Strain Energies in Hydrocarbons from Heats of Combustion. III. 3, 4, 5, 6-and 2, 4, 5, 7-Tetramethylphenanthrenes1a

HA Karnes, BD Kybett, MH Wilson…

Index: Karnes,H.A. et al. Journal of the American Chemical Society, 1965 , vol. 87, # 24 p. 5554 - 5558

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Citation Number: 21

Abstract

High-purity samples of 3, 4, 5, 6-and 2, 4, 5, 7-tetramethylphenanthrenes have been synthesized. Heats of combustion and vapor pressure measurements have established the buttressing effect of the methyl groups in the 3-and 6-positions on the 4-and 5-methyl groups as 3.6 i 1 kcal. lmolelCH3 group. The buttressing effect of the fused ring in 1 ', 9-dimethyl-1, 2- benzanthracene is 3.0 i 1 kcal. lmole.