Methane, dimesityl

Malonic acid, amino-, diethyl ester, HYDROCHLORIDE, 40, 24 Malonic acid, bts(hydroxymethyl)-, DIETHYL ETHER, 40, 27 Malonitrile, condensation with tetra-cyanoethylene, 41, 99 2-Mercaptopyrimidine, 43, 6S hydrochloride of, 43, 68 Mercuric oxide in preparation of bromo-cyclopropane, 43, 9 Mesityl isocyanide, 41,103 5-Methallyl-l,2,3,4,5-pentachlorocyclo-pentadiene, 43, 92 Methane, dimesityl-, 43, 57 Methanesiileinyl chloride, 40, 62 Methanesulfonic acid, solvent for making peroxybenzoic acid from benzoic acid, 43, 93... 

Trimesitylmethane is an example of isomerism and isomerization in ArgZX systems with C3 symmetry. Pioneering studies on related triaryl-methanes provided valuable observations concerning structure and mechanism of stereoisomerization. 39-41) jn particular, an X-ray diffraction study 41> of dimesityl-(2,4,6-trimethoxyphenyl)methane showed that this compound adopts a propeller conformation in the solid state. A similar conformation was found for triphenylmethane in the gas phase by electron diffraction.42) Nmr evidence is also consistent with such a conformation for triarylmethanes in solution. 39-41) jn the following, we shall briefly describe our experience with trimesitylmethane (7). 43)... 

Trimesitylmethane (12a) is an example of an AtjZX propeller possessing C3 symmetry. The X-ray analysis of dimesityl(2,4,6-trimethoxyphenyl)methane (12b) proves the propeller conformation for the solid state For the interconverting exo- and endomethoxyl groups of 12 in a temperature range of 118-176 °C, AH = 74 kJ/mol, AS = 9.8 eu are found, whereas for 13 a lower entropy of activation... 

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