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Medium size macrocycles incorporating combinations of coordinated-1,3-diyne units, oxygen donors and group 14 elements |
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| Authors: | Robert CJ Atkinson Martin J Mays |
| Institution: | a Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, UK b Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA c Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK |
| Abstract: | Two approaches have been employed to prepare medium size macrocycles incorporating combinations of coordinated-1,3-diyne units, oxygen donors and group 14 elements. In the first approach, the acid-catalysed reaction of {Co2(CO)6(μ-η2-HOCH2C C )}2] (1a) with either C6H5OH, C6H4-1,4-(OH)2 or C6H4-1,2-(OH)2 was found to form in good to moderate yield the nine-membered {Co2(CO)6}2{cyclo-μ-η2:μ-η2-CH2C2C2CH2OC6H4}2] (2) and the eight-membered macrocycles, {Co2(CO)6}2{cyclo-μ-η2:μ-η2-CH2C2C2CH2-2,3-C6H2-1,4-(OH)2}] (3) and {Co2(CO)6}2{cyclo-μ-η2:μ-η2-CH2C2C2CH2-3,4-C6H2-1,2-(OH)2}] (4), respectively. In contrast, treatment of the bis-lithiated derivative of 1a with Cl2SiR1R2 affords the silicon-containing nine-membered macrocycles {Co2(CO)6}2{cyclo-μ-η2:μ-η2-OCH2C2C2CH2OSiR1R2}] (5a R1 = R2 = Me; 5b R1 = R2 = Ph; 5c R1 = Me, R2 = Ph). Similarly, the germanium analogue of 5b, {Co2(CO)6}2{cyclo-μ-η2:μ-η2-OCH2C2C2CH2OGePh2}] (6) can be prepared from Cl2GePh2. Single crystal X-ray diffraction studies have been reported on 2, 3, 5a, 5b and 6. |
| Keywords: | Macrocycle Cobalt Coordinated 1 3-diyne Oxygen donor Group 14 |
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