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Erlenmeyers expansion of the isosterism concept

Starting in 1932, Erlenmeyei pnblished a series of detailed studies about the isosterism concepL and particularly. [Pg.293]

Erlenmeyer also proposed three expansions of the isosterism concept  [Pg.293]

To the whole group of elements present in a given column of the periodic table. Thus silicon becomes isosteric to carbon, sulfur to oxygen, etc. [Pg.293]

To the pseudoatoms, with the aim of including groups which at a first glance seem totally different, but which, in practice, possess rather similar properties. This is the case for the psendohalogens (e.g. C1=CN=SCN, etc.) [Pg.293]

To the ring eqnivalents the equivalence between —CH=CH— and —S— explaining the well-known analogy between benzene and thiophene (Table 15.3). [Pg.293]




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Erlenmeyer

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Isosteric

The expansion

The isosterism concept

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