Photoinduced [6+ 2] cycloadditions of alkynes to tricarbonylcycloheptatrienechromium (0)
K Chaffee, JB Sheridan, A Aistars
Index: Chaffee, Karen; Sheridan, John B.; Aistars, Arnis Organometallics, 1992 , vol. 11, p. 18 - 19
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Citation Number: 46
Abstract
Smmry: Photolysis of [($ C, H,) Cr (CO),](1) and RG CR (2a, R= Ph; 2b, R= Tol) in toluene or n-hexane resutts in the formation of [(772: r14-CsH6R2) cr (cO)~](3a, b) in 70-85% isolated yield via a [6 4-21 cycloaddition reaction. Heating 3a, b in toluene gives the bicyclo [4.2. 1]- nona-2, 4, 7-trienes 4a, b and [(~-C, H, Me) Cr (CO),]. Photolysis of 1 and excess DMAD (dimethyl acetylenedicarboxylate, 5) in toluene at 0 OC yields the bicyclotriene 4c as the ...
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