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Typical Procedure for the Preparation of Dimethyl 5-(tert-Butylimino)-3,3,4,4-tetracyanocyclopent-1-ene-1,2-dicarboxylate (4a) To a magnetically stirred solution of tetracyanoethylene (0.128 g, 1.0 mmol) and dimethylacetylenedicarboxylate (0.140 g, 1.0 mmol) in CH2Cl 2 (15 mL) was added dropwise a mixture of tert-butyl isocyanide (0.83 g, 1 mmol) in CH2Cl2 (2 mL) at -10°C over 10 min. The mixture was allowed to warm to r.t. and was stirred for 15 h. After completion of the reaction, the solvent was removed under vacuum and the residue was crystallized from CH2Cl2-n-hexane (1:2) to yield 0.353 g of 4a as a cream powder (100, mp 161-162°C. IR (KBr, νmax, 2256, 2207, 1739 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.56 [s, 9 H, CH3) 3C, 3.96 (s, 3 H, OCH3, 4.06 s, 3 H, OCH3
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4: C, 67.92; H, 4.01; N, 14.67. Found: C, 67.46; H, 3.87; N, 15.40.
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