Abstract
Abstract I-t-Butylacetylene-2-phosphonic acid diethyl and di-iso-propyl esters, 6a, 6b were synthesized via the NiCl2 promoted MICHAELIS-ARBUZOV-type reactions. Ethyl, iso-propyl and methyl esters 7a–7c of 1-t-butylethane-1,2,2-triphosphonic acid were obtained by three routes including the “anomalous MICHAELIS-BECKER-type” reaction. In addition the parent triphosphonic acid 7d and an anilinium salt 7e were synthesized. These overcrowded molecules exist at ambient temperature in two different rotameric forms.
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