Diphenylmethane, boiling point

By-products are formed in both preparations thus in the former, anthracene, and o- and p-dibenzylbenzenes are present in the fraction of high boiling point. Diphenylmethane is more conveniently obtained by the interaction of benzyl chloride and benzene in the presence of aluminium amalgam ... 

Estimate the critical constants for diphenylmethane using Lydersen s method normal boiling point 537.5 K, molecular mass 168.2, structural formula ... 

Benzophenone melts at 48° and boils without decomposition at 306.1°. When the ketone is formed as the result of the oxidation of diphenylmethane and certain other substances, it is obtained, at times, in a form which melts at 27°. The difference between the two forms is not the result of a difference in structure. The low melting variety readily passes into the ordinary form when treated with a trace of the latter. The difference in melting point and crystalline structure may be the result of a difference in molecular aggregation. It will be recalled that sulphur, phosphorus, and other elements exist in a variety of forms. 

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