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The “deltic guanidinium” ion is described here as a “macrostere” of the guanidinium ion. The use of the 2,4‐dimethoxybenzyl protecting group allows for the synthesis of the fully unsubstituted parent compound and a variety of derivatives bearing multiple N–H functions for the first time. Deltic urea, deltic thiourea, and deltic benzamidine are also synthesized. A comparison of the physical properties...
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