摘要:
Selective iodination of the cyclopentadienylruthenium tricarbadecaboranyl complexes 1-(eta(5)-C5H5)-2-Ph-closo-1,2,3,4-RuC3B7H9 (1) and 1-(eta(5)-C-5(CH3)(5))-2-Ph-closo-1,2,3,4-RuC3B7H8 (2) to form their mono-iodo derivatives, 1-(eta(5)-C5H5)-2-Ph-6-I-closo-1,2,3,4-RuC3B7H9 (3) and 1-(eta(5)-C-5(CH3)(5))-2-Ph-6-I-closo-1,2,3,4-RuC3B7H8 (4), was achieved in 90% yields by their reactions with ICl in CH2Cl2 solutions. Also isolated in trace amounts from the reaction with 2 was the di-iodo 1-(eta(5)-C-5(CH3)(5))-2-Ph-6,11-I-2-closo-1,2,3,4-RuC3B7H7, (5) complex. The sonication-promoted Sonogashira coupling reaction of 3 with terminal acetylenes catalyzed by Pd(dppf)Cl-2/CuI yielded the functionalized ruthenatricarbadecaboranyl complexes 1-(eta(5)-C5H5)-2-Ph-6-(Ph-Ch=C)-closo-1,2,3,4-RuC3B7H8 (6), 1-(eta(5)-C5H5)-2-Ph-6-[CH3CH2C(O)OCH2-C=C]-closo-1,2,3,4-RuC3B7H8 (7), 1-(eta(5)-C5H5)-2-Ph-6-[(eta(5)-C5H5)Fe(eta(5)-C5H4)-C=C]-closo-1,2,3,4-RuC3B7H8 (8) and 1-(eta(5)-C5H5)-2-Ph-6-[(CH3)(3)Si-C=C]-closo-1,2,3,4-RuC3B7H8 (9). These reactions thus provide a versatile, systematic pathway for the syntheses of a wide variety of new types of functionalized ruthenatricarbadecaboranyl complexes. (C) 2012 Elsevier B. V. All rights reserved.